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Auriferous pyrite formed by episodic fluid inputs in the Akeshi and Kasuga high-sulfidation deposits, Southern Kyushu, Japan Miner. Deposita (IF 4.323) Pub Date : 2021-03-31 Mizuki Ishida, Rurik Romero, Mathieu Leisen, Kazutaka Yasukawa, Kentaro Nakamura, Fernando Barra, Martin Reich, Yasuhiro Kato
Pyrite geochemistry has proven useful for tracking changes in the composition and physico-chemical conditions of hydrothermal fluids in ore-forming environments. Here, we investigated the microtextural features and chemical composition of pyrite, a main Au-bearing phase in the Akeshi and Kasuga deposits (Southern Kyushu, Japan), to better constrain the ore-forming processes in these high-sulfidation
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Grandite-based resource characterization of the skarn-hosted Cu-Zn-Mo deposit of Antamina, Peru Miner. Deposita (IF 4.323) Pub Date : 2021-03-20 Carsten Laukamp, Monica LeGras, Victor Montenegro, Steve Windle, Angus McFarlane
Field and drill core hyperspectral sensing technologies are cost-effective tools for identifying footprints of hydrothermal mineral systems, vectoring towards potential ore bodies and differentiating domains in ore deposits. Hyperspectral visible-near, shortwave and thermal infrared data were collected from drill core and chip samples from the Cu-Zn-Mo deposit of Antamina, Peru, to map the relative
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Tourmaline as a potential mineral for exploring porphyry deposits: a case study of the Bilihe gold deposit in Inner Mongolia, China Miner. Deposita (IF 4.323) Pub Date : 2021-03-16 Wenbo Li, Xueyuan Qiao, Fanghua Zhang, Lejun Zhang
Tourmaline is widespread at the Bilihe porphyry gold deposit in Inner Mongolia, China. Five types of tourmaline are recognized based on their occurring locations and microscopic structures: (1) Tur-A in quartz–magnetite ± K-feldspar veins and related potassic-altered rocks, (2) Tur-B in auriferous quartz veinlets, (3) Tur-C in the intermediate argillic shell, (4) Tur-D in late quartz–carbonate–tourmaline–pyrite
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Gold occurrences of the Woumbou–Colomine–Kette district, eastern Cameroon: ore-forming constraints from petrography, SEM–CL imagery, fluid inclusions, and C–O–H–S isotopes Miner. Deposita (IF 4.323) Pub Date : 2021-03-16 Kevin Igor Azeuda Ndonfack, Yuling Xie, Richard Goldfarb
The Woumbou–Colomine–Kette district is located in the East Metallogenic Province of the Republic of Cameroon. Northeast- to E-striking splays of the regional Pan-African crustal-scale Sanaga Shear Zone control widespread gold mineralization. Gold occurs within local shear zones developed along granite-gneiss contacts, as well as within the margins of the Pan-African intrusions. Field investigations
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Interplay of magmatic and diapiric environments in the Djebel El Hamra Pb-Zn-Hg ore district, northern Tunisia Miner. Deposita (IF 4.323) Pub Date : 2021-03-14 Riadh Abidi, Christian Marignac, Étienne Deloule, Christian Hibsch, Dominique Gasquet, Christophe Renac, Alireza K. Somarin, Nouri Hatira, Najet Slim-Shimi
The Djebel El Hamra Pb-Zn-Ba-Sr (Hg) deposits in northern Tunisia are hosted in a post-nappe anticline with a core of a Triassic evaporite diapir affected by the NE–SW-trending Ghardimaou-Cap Serrat lineament. Three stages of mineralization occurred in the Triassic dolostone: stages I and II caused alternating deposition of sulfate (Ba, Sr) and sulfide (sphalerite, galena) minerals; stage III formed
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Genesis of the Hebaoshan gold deposit in Fujian Province of Southeast China: constraints from a combined fluid inclusion, H-O-C-S-Pb-He-Ar isotope and geochronological study Miner. Deposita (IF 4.323) Pub Date : 2021-03-10 Ying Ma, Shao-Yong Jiang, Hartwig E. Frimmel, Lü-Yun Zhu, Suo-Fei Xiong, Run-Sheng Chen, Xue-Xie Li
The large Hebaoshan gold deposit (41.5 t Au, average grade: 3.5 g/t) is located in a hitherto poorly documented gold province in the northeastern part of the South China Block. It is hosted by Precambrian metasedimentary rocks that experienced Triassic greenschist- to amphibolite-facies metamorphism. Three hydrothermal stages can be distinguished: quartz + sericite + pyrite + pyrrhotite (stage I),
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Remelting of a Neoproterozoic arc root: origin of the Pulang and Songnuo porphyry Cu deposits, Southwest China Miner. Deposita (IF 4.323) Pub Date : 2021-03-08 Dian-Zhong Wang, Ruizhong Hu, Pete Hollings, Xian-Wu Bi, Hong Zhong, Li-Chuan Pan, Cheng-Biao Leng, Ming-Liang Huang, Jing-Jing Zhu
The reduced nature of the subducting slab has been used to explain the relatively poor endowment of economic porphyry copper deposits in Paleo-Tethyan arc systems. The presence of numerous porphyry Cu deposits in the southern Yidun terrane potentially challenges this model, because these deposits are thought to be the product of Paleo-Tethyan subduction. To investigate this, two representative deposits
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Chemical and boron isotopic compositions of tourmaline at the Dachang Sn-polymetallic ore district in South China: Constraints on the origin and evolution of hydrothermal fluids Miner. Deposita (IF 4.323) Pub Date : 2021-02-22 Kui-Dong Zhao, Ling-Huo Zhang, Martin R. Palmer, Shao-Yong Jiang, Cong Xu, He-Dong Zhao, Wei Chen
The Dachang Sn-polymetallic ore district in South China is the second largest tin district in the world with a tin reserve of over one million tonnes. Zn-Cu skarn and stratiform, massive, and vein Sn-Pb-Zn ores are all present in this district. This has led to a debate as to whether the Sn orebodies were formed by Cretaceous magmatic-hydrothermal replacement or Devonian submarine exhalative-hydrothermal
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Chromitites of the Kraka ophiolite (South Urals, Russia): geological, mineralogical and structural features Miner. Deposita (IF 4.323) Pub Date : 2021-02-21 Dmitry E. Saveliev
The paper describes disseminated tabular, podiform massive, and transitional chromitite deposits from a mantle section of the Kraka ophiolite massif, South Urals, Russia. The chromitite is hosted by dunite with no correlation between their size and quality and the size of the dunite bodies. Thick dunite bodies mostly host disseminated fine-grained banded chromitite; massive ores are composed of coarse-grained
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Reduction of oxidized sulfur in the formation of the Grasberg porphyry copper-gold deposit, Papua, Indonesia Miner. Deposita (IF 4.323) Pub Date : 2021-02-05 Adi Sulaksono, Yasushi Watanabe, Antonio Arribas, Takuya Echigo, Reza Al Furqan, Clyde A. Leys
The reduction of oxidized sulfur is essential in porphyry copper deposits whose mineralization predominantly comprises copper sulfides, whereas their source magmas are oxidized with most of their sulfur as SO42− and with exsolved fluids having SO2>>H2S. To estimate the redox state of sulfur, we examined drill cores that intersect potassic and unaltered intrusive rocks in the deeper levels of the Grasberg
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Chemical and physical heterogeneity within native gold: implications for the design of gold particle studies Miner. Deposita (IF 4.323) Pub Date : 2021-02-01 Robert John Chapman, David Archibald Banks, Michael Thomas Styles, Richard David Walshaw, Sandra Piazolo, Daniel Joseph Morgan, Matthew Russel Grimshaw, Carl Peter Spence-Jones, Thomas James Matthews, Olga Borovinskaya
Studies of populations of gold particles are becoming increasingly common; however, interpretation of compositional data may not be straightforward. Natural gold is rarely homogenous. Alloy heterogeneity is present as microfabrics formed either during primary mineralization or by modification of pre-existing alloys by chemical and physical drivers during subsequent residence in either hypogene or surficial
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The prograde-to-retrograde evolution of the Huangshaping skarn deposit (Nanling Range, South China) Miner. Deposita (IF 4.323) Pub Date : 2021-01-29 Da-Peng Zhu, Huan Li, Thomas J. Algeo, Wei-Cheng Jiang, Chong Wang
Huangshaping is a world-class skarn deposit hosting abundant W–Sn polymetallic mineralization in the Nanling Range, South China. Although the geochemistry of skarn-hosted mineral deposits has been extensively studied, the role of the prograde-to-retrograde stage transition in the enrichment and precipitation of metallic elements in high-temperature systems has received little study to date. Here, we
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Geochemical signatures of mineralizing events in the Juomasuo Au–Co deposit, Kuusamo belt, northeastern Finland Miner. Deposita (IF 4.323) Pub Date : 2021-01-19 Mikael Vasilopoulos, Ferenc Molnár, Hugh O’Brien, Yann Lahaye, Marie Lefèbvre, Antonin Richard, Anne-Sylvie André-Mayer, Jukka-Pekka Ranta, Matti Talikka
The Juomasuo Au–Co deposit, currently classified as an orogenic gold deposit with atypical metal association, is located in the Paleoproterozoic Kuusamo belt in northeastern Finland. The volcano-sedimentary sequence that hosts the deposit was intensely altered, deformed, and metamorphosed to greenschist facies during the 1.93–1.76 Ga Svecofennian orogeny. In this study, we investigate the temporal
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LA-ICPMS U-Pb dating reveals cassiterite inheritance in the Yazov granite, Eastern Siberia: Implications for tin mineralization Miner. Deposita (IF 4.323) Pub Date : 2021-01-07 L. A. Neymark, C. S. Holm-Denoma, A. M. Larin, R. J. Moscati, Yu. V. Plotkina
U-Pb dating of cassiterite and zircon from the Yazov granite (Transbaikalia region, Eastern Siberia, Russia) and cassiterite from spatially associated tin mineralization in the Tuyukan ore district in the Tonod uplift was conducted using in situ laser ablation inductively coupled plasma mass spectrometry. These analyses allow comparison of isotopic systematics for both minerals, especially related
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Geology and genesis of the Shalipayco evaporite-related Mississippi Valley-type Zn–Pb deposit, Central Peru: 3D geological modeling and C–O–S–Sr isotope constraints Miner. Deposita (IF 4.323) Pub Date : 2021-01-07 Saulo B. de Oliveira, Craig A. Johnson, Caetano Juliani, Lena V. S. Monteiro, David L. Leach, Marianna G. N. Caran
The Shalipayco Zn–Pb deposit, in central Peru, is composed of several stratabound orebodies, the largest of which are the Resurgidora and Intermedios, contained in carbonate rocks of the Upper Triassic Chambará Formation, Pucará group. Petrography suggests that a single ore-forming episode formed sphalerite and galena within vugs, open spaces, and fractures. Three-dimensional (3D) geological modeling
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The Santa Lúcia Cu-Au deposit, Carajás Mineral Province, Brazil: a Neoarchean (2.68 Ga) member of the granite-related copper-gold systems of Carajás Miner. Deposita (IF 4.323) Pub Date : 2021-01-05 Raphael B. Hunger, Gustavo H. C. de Melo, Roberto P. Xavier, Carolina P. N. Moreto, Cristina Talavera, Zhi-Kun Su, Xin-Fu Zhao
The Santa Lúcia copper-gold deposit lies in the southeastern portion of the Carajás Mineral Province, along NW-SE splays of the Carajás Fault. The deposit is hosted by a rhyolitic subvolcanic rock, which is crosscut by pegmatite intrusions. The paragenetic evolution at Santa Lúcia encompasses an early stage of chlorite alteration, followed by potassic alteration with microcline, greisenization (qu
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Integration of multiple sulfur isotopes with structural analysis unveils the evolution of ore fluids and source of sulfur at the Kanowna Belle Archean orogenic gold deposit, Yilgarn Craton, Western Australia Miner. Deposita (IF 4.323) Pub Date : 2021-01-05 Dennis Sugiono, Nicolas Thébaud, Crystal LaFlamme, Marco Fiorentini, Laure Martin, Jamie Rogers, Giovanna Lorusso, Chris McFarlane
The Kanowna Belle deposit is a world-class Archean orogenic gold system that witnessed multiple fluid episodes over a protracted deformation history. The hydrothermal fluid circulation episodes at the Kanowna Belle deposit initiated with the precipitation of early gold-bearing carbonate-famatinite-pyrite-telluride-electrum veins (V1a). These early veins were subsequently folded during a NE-SW shortening
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Trace element composition and U-Pb ages of cassiterite from the Bolivian tin belt Miner. Deposita (IF 4.323) Pub Date : 2021-01-05 Laura Gemmrich, Lisard Torró, Joan Carles Melgarejo, Oscar Laurent, Jean Vallance, Cyril Chelle-Michou, Thierry P. A. Sempere
The Bolivian tin belt is a metallogenic province in the Eastern Cordillera of the Andes known for its Sn, W, Ag, and base metal deposits. Cassiterite, which is a major constituent in many magmatic-hydrothermal ore deposits from the Bolivian tin belt, can incorporate dozens of elements within its crystal lattice, making it a useful geological tracer mineral and also a potential host of critical elements
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The Niederschlag fluorite-(barite) deposit, Erzgebirge/Germany—a fluid inclusion and trace element study Miner. Deposita (IF 4.323) Pub Date : 2021-01-05 Sebastian Haschke, Jens Gutzmer, Cora C. Wohlgemuth-Ueberwasser, Dennis Kraemer, Mathias Burisch
The Niederschlag fluorite-barite vein deposit in the Western Erzgebirge, Germany, has been actively mined since 2013. We present the results of a first comprehensive study of the mineralogy, petrography, fluid inclusions, and trace element geochemistry of fluorite related to the Niederschlag deposit. Two different stages of fluorite mineralization are recognized. Stage I fluorite is older, fine-grained
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Genesis of the low sulfide-high-grade PGE mineralization in the W Horizon, Coldwell Complex, Canada: quantitative modeling for PGE reef-style mineralization in syn-magmatic sills Miner. Deposita (IF 4.323) Pub Date : 2021-01-05 Yonghua Cao, David Good, Robert Linnen, Iain Samson, Ryan Ruthart
The W Horizon is a thin continuous zone of low sulfide-high-grade platinum group element (PGE) mineralization in the Two Duck Lake gabbro at the Marathon Cu-PGE deposit, Coldwell Complex, Canada, that resembles reef-type PGE deposits found in much larger intrusions. The Marathon deposit was previously shown to have grown by accretion of syn-magmatic, sulfide-bearing sill-like intrusions that formed
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Uranium mobility and deposition over 1.3 Ga in the Westmoreland area (McArthur Basin, Australia) Miner. Deposita (IF 4.323) Pub Date : 2021-01-05 Joséphine Gigon, Julien Mercadier, Irvine R. Annesley, Antonin Richard, Andrew S. Wygralak, Roger G. Skirrow, Terrence P. Mernagh, Ion Probe Team Nancy
The Westmoreland area is located in the southern part of the McArthur Basin (Australia) and hosts several uranium (U) deposits and prospects. Previous studies proposed that U mineralisation formed under conditions similar to the unconformity-related U deposits of the Alligator Rivers Uranium Field (ARUF), located north of the McArthur Basin. Detailed mineralogical, geochemical and geochronological
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Silicate-replacive high sulfidation massive sulfide orebodies in a porphyry Cu-Au system: Bor, Serbia Miner. Deposita (IF 4.323) Pub Date : 2020-12-11 Dina Klimentyeva, Thomas Driesner, Albrecht von Quadt, Trajča Tončić, Christoph Heinrich
The Cu-Au deposit of Bor (Serbia) represents a continuum of mineralization styles, from porphyry-style ore occurring in quartz-magnetite-chalcopyrite veins and chalcopyrite disseminations to high-sulfidation epithermal Cu-Au ores in pyrite-chalcopyrite and anhydrite-sulfide veins. Decisive for the great economic importance of Bor is the presence of exceptionally rich high-sulfidation massive sulfide
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Introduction to the special issue on the Flatreef PGE-Ni-Cu deposit, northern limb of the Bushveld Igneous Complex Miner. Deposita (IF 4.323) Pub Date : 2020-12-02 Wolfgang D. Maier, Marina Yudovskaya, Pedro Jugo
More than 30 years ago, Cox and Singer (1986) suggested that magmatic platinum-group element (PGE)-Ni-Cu deposits are amongst the best understood of ore deposits, yet the origin of PGE mineralization in the Bushveld Igneous Complex (BIC) remains controversial after a century of study. In the northern limb of the BIC, the unravelling of ore formation proved particularly difficult due to relatively poor
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In situ geochemistry and Fe–O isotopic composition of iron oxides from the Pha Lek Fe deposit, northwest Truong Son orogenic belt, Laos: implications for ore-forming processes Miner. Deposita (IF 4.323) Pub Date : 2020-11-22 Lin Hou, Linnan Guo, Siwei Xu, Qiming Zhang, Xiangting Zeng
The Pha Lek Fe-polymetallic deposit in the southwest of the Truong Son orogenic belt records the evolution and metallogenesis of the southeastern Asia Tethys. Debates remain on the roles the Late Triassic volcanism played in the formation of the iron oxides of the deposit. Petrographic and SEM studies led to the recognition of two dominant iron oxides (magnetite and hematite) and three stages of mineralization
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Geology and ore genesis of the carbonatite-associated Yangibana REE district, Gascoyne Province, Western Australia Miner. Deposita (IF 4.323) Pub Date : 2020-11-10 Paul Slezak, Carl Spandler, Andy Border, Kieren Whittock
The Yangibana rare earth element (REE) district consists of multiple mineral deposits/prospects hosted within the Mesoproterozoic Gifford Creek Carbonatite Complex (GCCC), Western Australia, which comprises a range of rock types including calcite carbonatite, dolomite carbonatite, ankerite–siderite carbonatite, magnetite–biotite dykes, silica-rich alkaline veins, fenite, glimmerites and what have historically
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Assessing the extent of local crust assimilation within the Flatreef, northern limb of the Bushveld Igneous Complex, using sulfur isotopes and trace element geochemistry Miner. Deposita (IF 4.323) Pub Date : 2020-11-05 Evan Keir-Sage, Matthew I. Leybourne, Pedro J. Jugo, Danie F. Grobler, Cédric C. Mayer
The proximity to metasedimentary footwall rocks relative to platinum group element (PGE) mineralized intrusive rocks in the northern limb of the Bushveld Igneous Complex (BIC) has resulted in complex local contamination in the intrusions. To assess the extent of incorporation of non-magmatic material and its effects on PGE mineralization, major element, trace element, and S isotopic data were collected
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Sulfur isotopic compositions of sulfides along the Southwest Indian Ridge: implications for mineralization in ultramafic rocks Miner. Deposita (IF 4.323) Pub Date : 2020-10-31 Teng Ding, Chunhui Tao, Ágata Alveirinho Dias, Jin Liang, Jie Chen, Bin Wu, Dongsheng Ma, Rongqing Zhang, Jia Wang, Shili Liao, Yuan Wang, Weifang Yang, Jia Liu, Wei Li, Guoyin Zhang, Hui Huang
The recently explored Tianzuo hydrothermal field in serpentinized ultramafic rocks of the amagmatic segment of the ultraslow-spreading Southwest Indian Ridge displays high-temperature sulfide mineralization (isocubanite, sphalerite, and minor pyrrhotite) and low-temperature (pyrite and covellite) phases. Pyrite can be subdivided into pyrite-I and -II, with the former generally having a pseudomorphic
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Formation of highly Zn-enriched sulfide scale at a deep-sea artificial hydrothermal vent, Iheya-North Knoll, Okinawa Trough Miner. Deposita (IF 4.323) Pub Date : 2020-10-29 Tatsuo Nozaki, Toshiro Nagase, Junji Torimoto, Yutaro Takaya, Jun-ichiro Ishibashi, Kazuhiko Shimada, Masayuki Watanabe, Yuka Masaki, Koichi Iijima, Kazuya Kitada, Masafumi Saitoh, Takahiro Yokoyama, Keita Akiyama, Noriaki Sakurai, Tomokazu Saruhashi, Masanori Kyo, Hidenori Kumagai, Lena Maeda
Artificial hydrothermal vents, created by boreholes that discharge hydrothermal fluids and useful for observing secular changes in mineral precipitates and the chemical compositions of hydrothermal fluids, are periodically cleaned of scale deposits. Here, we report petrographic and geochemical features of hydrothermal scale with a concentric structure and extreme enrichment in Zn, recovered as an intact
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Genesis and timing of Mo mineralization in the Mada Ring Complex, north-central Nigeria: insights from whole-rock geochemistry, Nd-Sr isotopes, zircon U-Pb-Hf isotopes, and molybdenite Re-Os systematics Miner. Deposita (IF 4.323) Pub Date : 2020-10-26 Musa Bala Girei, Huan Li, Victor Ikechukwu Vincent, Thomas J. Algeo, Safiyanu Muhammad Elatikpo, Saleh Ibrahim Bute, Hafizullah Abba Ahmed, Abdulgafar Kayode Amuda
The genesis and timing of molybdenum (Mo) mineralization in the Mada Ring Complex, north-central Nigeria, have been constrained using a combination of whole-rock elemental geochemistry, Nd-Sr isotopes, zircon U-Pb-Hf isotopes, and molybdenite Re-Os geochronological data. The Mada Ring Complex is one of fifty-three within-plate alkaline ring complexes with economically significant Sn and Nb production
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Ore-forming processes in the Khetri Copper Belt, western India: constraints from trace element chemistry of pyrite and C-O isotope composition of carbonates Miner. Deposita (IF 4.323) Pub Date : 2020-10-17 Abu Saeed Baidya, Atlanta Sen, Dipak C. Pal, Dewashish Upadhyay
The Khetri Copper Belt of the Aravalli-Delhi Fold Belt in western India hosts Cu (± Au ± Ag ± Co ± Fe ± REE ± U) mineralization that is likely of iron oxide-copper-gold (IOCG) type. The study on the Madan-Kudan deposit in this belt documents four vein types: Type-1 (pyrite ± chalcopyrite ± magnetite ± biotite ± scapolite ± amphibole ± chlorite), Type-2 (chalcopyrite-pyrrhotite-pyrite-magnetite-amphibole-chlorite)
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New 40 Ar/ 39 Ar and (U-Th)/He dating for the Zhunuo porphyry Cu deposit, Gangdese belt, southern Tibet: implications for pulsed magmatic-hydrothermal processes and ore exhumation and preservation Miner. Deposita (IF 4.323) Pub Date : 2020-10-15 Xiang Sun, Cheng-Biao Leng, Pete Hollings, Qing-Jie Song, Ru-Yue Li, Xiu-Quan Wan
Understanding the magmatic-hydrothermal cooling and exhumation history is fundamental for investigating porphyry deposit formation and preservation. In the Zhunuo porphyry copper deposit of southern Tibet, hydrothermal biotite related to early potassic alteration likely formed from 14.7 ± 0.3 Ma (zircon U-Pb age) to 14.23 ± 0.13 Ma (molybdenite Re-Os age) and cooled below the closure temperature for
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Multistage genesis of the late Cretaceous manganese karst-hosted Tasdremt deposit (High Atlas, Morocco) Miner. Deposita (IF 4.323) Pub Date : 2020-10-15 Augustin Dekoninck, Gilles Ruffet, Yves Missenard, Oriane Parizot, Mohamed Magoua, Abdellah Mouttaqi, Gaëtan Rochez, Johan Yans
The eastern part of the Souss Basin (Morocco) contains several Mn deposits in the Tasdremt district. Three Mn orebodies occur within the Cenomanian-Turonian dolostones and the Senonian (Coniacian to Maastrichtian) detrital series, the main orebody being located at the boundary between them. The Mn ores consist of coronadite group minerals, mostly coronadite and hollandite, in a karstified dolostone
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Titanite in situ SIMS U–Pb geochronology, elemental and Nd isotopic signatures record mineralization and fluid characteristics at the Pusangguo skarn deposit, Tibet Miner. Deposita (IF 4.323) Pub Date : 2020-10-12 MingJian Cao, KeZhang Qin, Noreen J. Evans, GuangMing Li, XiaoXiao Ling, Brent I. A. McInnes, JunXing Zhao
The Pusangguo skarn is a newly discovered Cu-Pb-Zn deposit in the Gangdese metallogenic belt, Tibet. In order to constrain the age of the deposit and the source of hydrothermal fluids, various types of titanite and coexisting minerals in the Pusangguo deposit were studied. The titanite occurring interstitially in fresh granodiorite is magmatic and characterized by high REE, Y, Mn, and Lu/Hf ratios
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Emplacement of magmatic Cu-Au-Te(-Ni-PGE) sulfide blebs in alkaline mafic rocks of the Mordor Complex, Northern Territory, Australia Miner. Deposita (IF 4.323) Pub Date : 2020-09-29 David A. Holwell, Daryl E. Blanks
Magmatic Ni-Cu-PGE sulfide mineralisation is mostly confined to tholeiitic to komatiitic mafic-ultramafic intrusions, yet there have been an increasing number of occurrences recorded in alkaline-ultramafic, post-collisional magmatic systems, particularly in the lower and middle crust that generally display a characteristic Cu-Au-Te enrichment over more conventional Ni-Cu(-PGE) mineralisation. The Mordor
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Geochemistry and geochronology of the Kiggavik uranium deposit, Nunavut, Canada Miner. Deposita (IF 4.323) Pub Date : 2020-09-16 Brandi M. Shabaga, Mostafa Fayek, David Quirt, Charlie W. Jefferson, Patrick Ledru
The Thelon Basin, Nunavut, Canada, is similar in age, size, and geology to the U producing Athabasca Basin in Saskatchewan. The Kiggavik project area, located immediately south of the Aberdeen sub-basin of the Thelon Basin, contains U deposits and showings along a ~ 30-km-long NE–SW structural trend. The basement-hosted Kiggavik deposit, comprising three separate mineralized zones (Main, Centre, and
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Gold and tin mineralisation in the ultramafic-hosted Cheoeum vent field, Central Indian Ridge Miner. Deposita (IF 4.323) Pub Date : 2020-09-16 Sun Ki Choi, Sang Joon Pak, Jonguk Kim, Jung-Woo Park, Seung-Kyu Son
The Cheoeum vent field (CVF) is the first example of an inactive ultramafic-hosted seafloor massive sulphide (SMS) deposit identified in the middle part of the Central Indian Ridge. Here, we report on the detailed mineralogy and geochemistry of ultramafic-hosted sulphide sample atop a chimney, together with a few small fragments. Hydrothermal chimneys are characterised by high concentrations of Au
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An overview of chalcophile element contents of pyrrhotite, pentlandite, chalcopyrite, and pyrite from magmatic Ni-Cu-PGE sulfide deposits Miner. Deposita (IF 4.323) Pub Date : 2020-09-14 Eduardo T. Mansur, Sarah-Jane Barnes, Charley J. Duran
We have compiled the trace element concentrations in pyrrhotite, pentlandite, chalcopyrite, and pyrite from magmatic Ni-Cu-PGE ore deposits with the aim of understanding their petrogenesis and whether these minerals can be used as indicator minerals. Among the samples, there are some of the most studied world-class Ni-Cu- (Aguablanca, Duluth, Jinchuan, Noril’sk-Talnakh-Kharaelakh, Sudbury, Voisey’s
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The origin and composition of carbonatite-derived carbonate-bearing fluorapatite deposits Miner. Deposita (IF 4.323) Pub Date : 2020-08-27 Sam Broom-Fendley, Pete R. Siegfried, Frances Wall, Mary O’Neill, Richard A. Brooker, Emily K. Fallon, Jonathan R. Pickles, David A. Banks
Carbonate-bearing fluorapatite rocks occur at over 30 globally distributed carbonatite complexes and represent a substantial potential supply of phosphorus for the fertiliser industry. However, the process(es) involved in forming carbonate-bearing fluorapatite at some carbonatites remain equivocal, with both hydrothermal and weathering mechanisms inferred. In this contribution, we compare the paragenesis
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Strontium isotope stratigraphy through the Flatreef PGE-Ni-Cu mineralization at Turfspruit, northern limb of the Bushveld Igneous Complex: evidence of correlation with the Merensky Unit of the eastern and western limbs Miner. Deposita (IF 4.323) Pub Date : 2020-08-20 Cédric C. Mayer, Pedro J. Jugo, Matthew I. Leybourne, Danie F. Grobler, Alexandre Voinot
The origin of PGE-Ni-Cu mineralization in the Platreef, northern limb of the Bushveld Igneous Complex (BIC), and the possible correlation with the Merensky Reef in the eastern and western limbs has been long debated. The Platreef and Merensky Reef share the same stratigraphic position in the uppermost part of the Upper Critical Zone (UCZ), near the transition to the overlaying Main Zone (MZ). However
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Interplay between thermal convection and compressional fault reactivation in the formation of unconformity-related uranium deposits Miner. Deposita (IF 4.323) Pub Date : 2020-08-18 Zenghua Li, Guoxiang Chi, Kathryn M. Bethune, Khalifa Eldursi, David Quirt, Patrick Ledru, David Thomas
A number of large and high-grade unconformity-related uranium deposits formed in intracratonic Proterozoic basins, including the Athabasca Basin in Canada and the McArthur Basin in Australia. These deposits occur close to the unconformities between the Paleo- to Mesoproterozoic basinal sequences and their Archean to Paleoproterozoic metasedimentary basement, and are spatially associated with reactivated
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Platinum-group and trace elements in Cu-sulfides from the Loolekop pipe, Phalaborwa: implications for ore-forming processes Miner. Deposita (IF 4.323) Pub Date : 2020-08-16 Loic Y. Le Bras, Robert Bolhar, Grant M. Bybee, Paul A. M. Nex, Bradley M. Guy, Thabitha Moyana, Paulien Lourens
Although Cu-sulfide mineralization within the Loolekop pipe of the Phalaborwa Igneous Complex has been extensively studied, certain aspects of the sulfide metallogenesis remain unclear. This research aims to constrain the relative timing and processes involved in Cu-sulfide mineralization within the Loolekop pipe through textural analysis and trace element composition of the three different types of
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Trace element composition of quartz from porphyry systems: a tracer of the mineralizing fluid evolution Miner. Deposita (IF 4.323) Pub Date : 2020-08-10 Bertrand Rottier, Vincent Casanova
Trace element composition of hydrothermal quartz reflects the P-T-X conditions of the mineralizing fluids and can be a potential tracer of the fluid evolution. To explore this potential, quartz trace element data from 21 porphyry Cu-(Au-Mo) and epithermal polymetallic deposits were compiled. In addition, quartz trace element data from six granite-related systems (granite, pegmatite, greisen, Sn-W-Mo
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Platinum mineralization of the Epilchik Ural-Alaskan type zoned complex (Far East Russia) Miner. Deposita (IF 4.323) Pub Date : 2020-08-10 Evgeniy Sidorov, Anton Kutyrev, Valery Chubarov, Elena Zhitova
The Epilchik Ural-Alaskan type mafic-ultramafic zoned complex, located in the northernmost part of the Koryak-Kamchatka Platinum Belt (Russian Far East), contains lode platinum mineralization. The outcrops of the complex are crossed by the Snegovaya River, which hosts placer platinum-group minerals (PGM) occurrences. The primary PGM assemblage of the Epilchik lode chromitites is typical for Ural-Alaskan
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Understanding the evolution of magmatic-hydrothermal systems based on microtextural relationships, fluid inclusion petrography, and quartz solubility constraints: insights into the formation of the Yulong Cu-Mo porphyry deposit, eastern Tibetan Plateau, China Miner. Deposita (IF 4.323) Pub Date : 2020-08-04 Maoyu Sun, Thomas Monecke, T. James Reynolds, Zhiming Yang
The evolution of the magmatic-hydrothermal system that formed the Eocene Yulong Cu-Mo porphyry deposit of the eastern Tibetan Plateau, China, is reconstructed based on the study of the sequence of stockwork vein sets showing systematic crosscutting relationships in hand specimen. Early A veins associated with potassic alteration of the porphyritic host are composed of vitreous quartz that is extensively
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Structural setting, wall rock alteration and gold mineralisation of the Mt. Percy gold deposit, Kalgoorlie, Western Australia Miner. Deposita (IF 4.323) Pub Date : 2020-07-30 Jerry Dunga, Daniel Sully, Steffen G. Hagemann, Paul Duuring, Leonid Danyushevsky
Field mapping, drill-core logging, petrography, laser ICP-MS analysis on pyrite, chlorite geothermometry and geochemical analysis of hydrothermally altered rocks reveal two distinct styles of gold mineralisation at Mt. Percy. The first style is D2 shear zone-hosted and correlates with Fimiston-style mineralisation documented in the Golden Mile. Laser ICP-MS analyses on pyrite indicate high As concentrations
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Low-temperature silica-rich gold mineralization in mafic VMS systems: evidence from the Troodos ophiolite, Cyprus Miner. Deposita (IF 4.323) Pub Date : 2020-07-29 Andrew J. Martin, Iain McDonald, Katie A. McFall, Christopher J. MacLeod, Hazel M. Prichard
The Troodos ophiolite Cyprus hosts the on-land analogue for actively forming mafic, Cu-rich, or Cyprus-type VMS deposits. In addition to high-temperature (> 350 °C) sulfide mound-related mineralization, other fossil seafloor mineralizing systems are known to operate, including those characterized by an enrichment in Au and abundant silicification. In this study the mineralogy and geochemistry of four
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Uranium mineralization associated with late magmatic ductile to brittle deformation and Na–Ca metasomatism of the Pan-African A-type Zabili syntectonic pluton (Mayo-Kebbi massif, SW Chad) Miner. Deposita (IF 4.323) Pub Date : 2020-07-26 Vanderhaeghe Olivier, Anne-Sylvie André-Mayer, Mbaguedje Diondoh, Eglinger Aurélien, Ohnenstetter Maryse, Isseini Moussa, Cuney Michel, Poujol Marc, Van Lichtervelde Marieke
The Mayo-Kebbi massif (Chad) exposes a Neoproterozoic juvenile crustal segment that has been tectonically accreted in the Central African Orogenic Belt and reworked during the Pan-African orogeny. It comprises a syntectonic high-K magmatic suite including the Zabili A-type granitic pluton. The Zabili pluton is made of a highly differentiated granite generated by fractional crystallization of a magma
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Chemical and boron isotope composition of tourmaline from the Kiaka orogenic gold deposit (Burkina Faso, West African Craton) as a proxy for ore-forming processes Miner. Deposita (IF 4.323) Pub Date : 2020-07-24 J. Gauriau, M. Harlaux, A.-S. André-Mayer, A. Eglinger, A. Richard, A. Fontaine, M.G. Lefebvre, D. Béziat, J. Villeneuve, D. Lemarchand
The Kiaka orogenic gold deposit (Burkina Faso), located in the Paleoproterozoic domain of the West African Craton, is characterized by a two-stage gold mineralization hosted in volcano-sedimentary metamorphic rocks that was formed during the Eoeburnean (2.20–2.13 Ga) and Eburnean (2.13–2.05 Ga) orogenic cycles. These two stages include an early disseminated low-grade gold mineralization and a late
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Late Cretaceous granitic magmatism and Sn mineralization in the giant Yinyan porphyry tin deposit, South China: constraints from zircon and cassiterite U–Pb and molybdenite Re–Os geochronology Miner. Deposita (IF 4.323) Pub Date : 2020-07-22 Peng-Cheng Hu, Wei-Guang Zhu, Hong Zhong, Rong-Qing Zhang, Xiao-Yu Zhao, Wei Mao
The Yinyan porphyry tin deposit in western Guangdong is spatially associated with quartz porphyry and granite porphyry. LA–ICP–MS zircon U–Pb dating defined an emplacement age of 78.5 ± 0.4 Ma for the quartz porphyry and 79.2 ± 0.9 Ma for the granite porphyry. LA–ICP–MS cassiterite U–Pb dating yielded Tera–Wasserburg lower intercept ages of 78.5 ± 0.6, 78.6 ± 1.2, and 78.2 ± 0.7 Ma, for cassiterite
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Ore genesis and hydrothermal evolution of the Shaxi porphyry Cu–Au deposit, Anhui province, Eastern China: evidence from isotopes (S–Sr–H–O), pyrite, and fluid inclusions Miner. Deposita (IF 4.323) Pub Date : 2020-07-22 Shiwei Wang, Taofa Zhou, Pete Hollings, Feng Yuan, Yu Fan, Noel C. White, Lejun Zhang
The Shaxi porphyry Cu–Au deposit is located in the northern part of the Luzong Basin on the outer edge of the southern Middle-Lower Yangtze River metallogenic belt, China. It is typical of the porphyry Cu–Au deposits in the metallogenic belt, with more than 1 Mt Cu at 0.55 wt% and 45 tons Au at 0.47 g/t. Hydrothermal alteration consists of a core of potassic alteration overprinted by a phyllic alteration
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Origin and classification of the Late Triassic Huaishuping gold deposit in the eastern part of the Qinling - Dabie Orogen, China: implications for gold metallogeny Miner. Deposita (IF 4.323) Pub Date : 2020-07-14 Changming Wang, Jun Deng, Leon Bagas, Xinyu He, Jing Zhang
The Huaishuping gold deposit is located in the Xiong’ershan Mountains of the Qinling-Dabie Orogen of central China. The mineralisation is structurally controlled and hosted by faulted rhyolite, quartz andesite, volcaniclastic rocks and volcanic breccia assigned to the Jidanping Formation towards the top the Palaeoproterozoic Xiong’er Group. The deposit has a resource of around 32 t with an average
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Strontium isotope variations in the Flatreef on Macalacaskop, northern limb, Bushveld Complex: implications for the source of platinum-group elements in the Merensky Reef Miner. Deposita (IF 4.323) Pub Date : 2020-07-14 J. J. Beukes, F. Roelofse, C. D. K. Gauert, D. F. Grobler, H. Ueckermann
The Platreef of the Bushveld Complex is one of three key stratigraphic units, along with the Merensky and UG-2 reefs, in which platinum-group elements are concentrated. The correlation between the Platreef and the stratigraphy from the western and eastern limbs of the BC has been challenging due to the heterogeneous and variable nature of the Platreef along strike. However, the discovery of the Flatreef
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Cu isotope systematics of conduit-type Cu–PGE mineralization in the Eastern Gabbro, Coldwell Complex, Canada Miner. Deposita (IF 4.323) Pub Date : 2020-07-08 Matthew J. Brzozowski, David J. Good, Changzhi Wu, Weiqiang Li
Chalcopyrite from the Cu–PGE sulfide deposits in the Eastern Gabbro, Coldwell Complex, Canada, exhibit a > 2‰ variation in δ65Cu. In the Marathon deposit, the δ65Cu of chalcopyrite increases from the lower Footwall Zone (− 1.49 to − 0.75‰), to the Main Zone (− 1.04 to 0.08‰), to the upper W Horizon (− 0.35 to 1.07‰). In the northern deposits, chalcopyrite at Four Dams and Sally have δ65Cu that range
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Formation of the Flatreef deposit, northern Bushveld, by hydrodynamic and hydromagmatic processes Miner. Deposita (IF 4.323) Pub Date : 2020-07-02 W. D. Maier, K. E. L. Abernethy, D. F. Grobler, G. Moorhead
New lithological and whole rock compositional data show that the main platinum-group element (PGE) horizons of the Flatreef succession show strong compositional similarities to the Merensky and Bastard reefs of the western Bushveld Complex (WBC), notably in terms of many immobile and incompatible minor and trace elements such as TiO2, Zr, Y, and REE. However, Al2O3, CaO, and Na2O contents are markedly
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Behavior of critical metals in metamorphosed Pb-Zn ore deposits: example from the Pyrenean Axial Zone Miner. Deposita (IF 4.323) Pub Date : 2020-07-02 Alexandre Cugerone, Bénédicte Cenki-Tok, Manuel Muñoz, Kalin Kouzmanov, Emilien Oliot, Vincent Motto-Ros, Elisabeth Le Goff
Rare metals (Ge, Ga, In, Cd) are key resources for the development of green technologies and are commonly found as trace elements in base-metal mineral deposits. Many of these deposits are in orogenic belts and the impact of recrystallization on rare metal content and distribution in sphalerite needs to be evaluated. Based on laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses
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Potential for Sullivan-type Pb-Zn-Ag deposits in modern sedimentary basins Miner. Deposita (IF 4.323) Pub Date : 2020-06-30 John F. Slack
Numerous modern sedimentary basins contain geological features similar to those associated with the giant (150 Mt) Sullivan Pb-Zn-Ag deposit (British Columbia) in the Mesoproterozoic Belt-Purcell Basin. Important features at Sullivan include a large synsedimentary mud volcano that hosts the stratabound and partly stratiform sulfide ores, an underlying vent complex of altered and mineralized rocks,
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The Mustajärvi orogenic gold occurrence, Central Lapland Greenstone Belt, Finland: a telluride-dominant mineral system Miner. Deposita (IF 4.323) Pub Date : 2020-06-30 Matthias Mueller, Petri Peltonen, Pasi Eilu, Richard Goldfarb, Eero Hanski
The Mustajärvi gold occurrence lies in the southern part of the Paleoproterozoic Central Lapland Greenstone Belt, in proximity to the first-order transcrustal Venejoki thrust fault system. The gold occurrence is structurally controlled by the second-order Mustajärvi shear zone, which is located at the contact between siliciclastic metasedimentary and mafic to ultramafic metavolcanic rocks. The main
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The Kallianos Au-Ag-Te mineralization, Evia Island, Greece: a detachment-related distal hydrothermal deposit of the Attico-Cycladic Metallogenetic Massif Miner. Deposita (IF 4.323) Pub Date : 2020-06-22 Stylianos F. Tombros, Sotirios Kokkalas, Karen St. Seymour, Panagiotis C. Voudouris, Anthony E. Williams-Jones, Degao Zhai, Jiajun Liu, Michalis G. Fitros
The Kallianos Au-Ag-Te deposit in Evia Island (Greece) comprises sixteen syntaxial veins that intersect the schists and marbles of the Cycladic Blueschist Unit. The veins are filled with quartz-I and quartz-II, contain two hypogene ore stages (stages I and II), and are surrounded by infrequent muscovite-chlorite alteration zones. A magmatic origin is deduced for the Kallianos Au-Ag-Te mineralization
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Oxide mineralogy and trace element chemistry as an index to magma evolution and Marathon-type mineralization in the Eastern Gabbro of the alkaline Coldwell Complex, Canada Miner. Deposita (IF 4.323) Pub Date : 2020-06-19 M. J. Brzozowski, I. M. Samson, J. E. Gagnon, D. J. Good, R. L. Linnen
The Eastern Gabbro of the alkaline Coldwell Complex, Canada, represents a Ni-poor conduit-type system that comprises two rock series, the Layered Series and Marathon Series, which intruded into a metabasalt package. Based on distinct variations in magnetite compatible (e.g., Ni, Cr) and incompatible (e.g., Sn, Nb) elements in Fe–Ti oxide intergrowths, the metabasalts, Layered Series, and Marathon Series
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Surge of ore metals in seawater and increased bio-activity: a tracer of VHMS mineralization in Archaean successions, Yilgarn Craton, Western Australia Miner. Deposita (IF 4.323) Pub Date : 2020-06-19 Vitor R. Barrote, Svetlana G. Tessalina, Neal J. McNaughton, Noreen J. Evans, Steven P. Hollis, Bradley J. McDonald
The Nimbus Ag–Zn(–Au) deposit is a hybrid VHMS deposit with epithermal characteristics formed in the Eastern Goldfields Superterrane, Yilgarn Craton, under shallow water (~ 700 mbsl), low-temperature conditions. Intersections of some ore lenses are high-grade and polymetallic, making similar styles of mineralization attractive Yilgarn exploration targets. The mineralization at Nimbus is hosted by a
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