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Noble gas geochemistry of phenocrysts from the Ciomadul volcanic dome field (Eastern Carpathians) Lithos (IF 3.39) Pub Date : 2021-04-07 Kata Molnár, György Czuppon, László Palcsu, Zsolt Benkó, Réka Lukács, Boglárka-Mercédesz Kis, Bianca Németh, Szabolcs Harangi
Noble gas isotopic composition of fluid inclusions was analyzed in amphibole, plagioclase and clinopyroxene phenocrysts from the shoshonitic and dacitic volcanic products of the Ciomadul volcanic dome field, the youngest volcanic system within the Carpathian-Pannonian Region. The highest Rc/RA ratios (3.0–3.8 RA) were obtained for high-mg clinopyroxene of the Malnaş shoshonite. High-Al amphiboles from
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The Triassic Duobaoshan appinite-granite suite, NE China: Implications for a water-fluxed lithospheric mantle and an extensional setting related to the subduction of the Mongol-Okhotsk Ocean Lithos (IF 3.39) Pub Date : 2021-04-16 Chao Zhao, Ke-Zhang Qin, Guo-Xue Song, Guang-Ming Li, Jing-Wen Mao
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Along-dip variations of subduction fluids: The 30–80 km depth traverse of the Schistes Lustrés complex (Queyras-Monviso, W. Alps) Lithos (IF 3.39) Pub Date : 2021-04-16 Clément Herviou, Anne Verlaguet, Philippe Agard, Michele Locatelli, Hugues Raimbourg, Benjamin Lefeuvre, Benoit Dubacq
The Queyras-Monviso traverse of the Schistes Lustrés complex, is a stack of underplated nappes of oceanic rocks subducted from blueschist- to eclogite-facies conditions. This study reports on salinities and gas contents of primary fluid inclusions trapped in high pressure veins from metasediments and metamafic rocks (445 fluid inclusions in 22 samples). These data provide snapshots of the compositions
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The effect of oxygen fugacity on diamond resorption in ascending kimberlite melt Lithos (IF 3.39) Pub Date : 2021-04-16 Alexander F. Khokhryakov, Alexey N. Kruk, Alexander G. Sokol
When transported by magmas to the Earth's surface, diamond crystals underwent resorption, the intensity of which significantly differed in various kimberlite pipes. We experimentally simulated diamond resorption at different oxygen fugacities (fO2) in ascending kimberlite magma enriched in CO2 and H2O. The experiments were carried out using specially prepared unaltered Group I kimberlite from the Udachnaya
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A latest Jurassic A-type granite in the Middle of Inner Mongolia: Petrogenesis and tectonic implications Lithos (IF 3.39) Pub Date : 2021-04-16 Shuang Gao, Wei-Feng Chen, Hong-Fei Ling, Li-Qiang Sun, Quan Ren, Guo-Ai Xie, Kai-Xing Wang, Rong-Song Tian
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Compositional signatures of dolerite dykes from the Purang ultramafic massif, Tibet: Implications for garnet-bearing components in the Neo-Tethyan mantle Lithos (IF 3.39) Pub Date : 2021-04-08 Qiangtai Huang, Hao Zheng, Xiaojun Sun, Qingkun Yang, Zhourong Cai, Bin Xia
We present geological, whole-rock geochemical, Sr–Nd isotopic and U–Pb geochronological data for the mafic dykes from the Purang ultramafic massif, South Tibet (China). The mafic dykes are composed of dolerite within a mylonitized harzburgite body. These mafic dykes are dated at 138.0–138.5 Ma using zircon and apatite U–Pb methods, and are characterized by enrichments in large-ion lithophile elements
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Petrogenesis of Early Cretaceous volcanic rocks of the northeastern North China Craton: Constraints from elemental and Sr–Nd–Pb isotope geochemistry Lithos (IF 3.39) Pub Date : 2021-04-07 Hao Zhou, Fu-Ping Pei, Wen-Liang Xu, Jing-Yang Wei, Yi-Peng Wang
This study examines the geochemical and whole-rock Sr–Nd–Pb isotopic compositions of Early Cretaceous volcanic rocks of the southern Jilin Province (Tonghua and Huanren areas) and Liaodong Peninsula (Xiuyan, Dandong, and Guiyunhua areas), northeastern North China Craton (NCC). Two groups of volcanic rocks are recognized in the northeastern NCC. The geochemistry and isotopic compositions of the intermediate-acid
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A unique period of bimodal volcanism at 130–110 Ma in the northern Sanandaj-Sirjan Zone: Evidence for an extensional setting Lithos (IF 3.39) Pub Date : 2021-04-13 Bahman Rahimzadeh, Shahryar Mahmoudi, Fernando Corfu, Vahid Ahadnejad, Albrecht Von Quadt
The Sanandaj-Sirjan metamorphic-magmatic Zone (SaSZ) represents the Mesozoic active continental margin of the Neotethys Ocean between the Arabian plate and the Iranian plateau. The zone evolved at the margin of ancient Ediacaran basement, as documented in this paper with an age of 557 Ma for a trondhjemite. The Mesozoic activity of the SaSZ was most intense with sedimentation and magmatism in the Jurassic
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Retrograde carbon sequestration in orogenic complexes: A case study from the Chinese southwestern Tianshan Lithos (IF 3.39) Pub Date : 2021-04-08 Han Hu, Alberto Vitale Brovarone, Lifei Zhang, Francesca Piccoli, Weigang Peng, Tingting Shen
The interaction between ascending carbonic fluids and rocks at shallow depths in orogenic systems plays a crucial role in carbon distribution and fluxes regulation. Here we present field, microstructural, petrological and geochemical results of carbonic fluid–rock interactions affecting exhumed mafic eclogites from the Chinese southwestern Tianshan ultrahigh-pressure (UHP) metamorphic belt. The mafic
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Petrogenesis and tectonic implications of the neoproterozoic mafic-ultramafic rocks in the western Jiangnan Orogen: Insights from in situ analysis of clinopyroxenes Lithos (IF 3.39) Pub Date : 2021-04-14 Caihua Kou, Yanxue Liu, Tingdong Li, Xiaozhong Ding, Heng Zhang, Yong Liu
The Huaqiao clinopyroxenite and Maodu gabbro are Neoproterozoic mafic-ultramafic rocks located in the western Jiangnan Orogen. Both rocks contain fresh clinopyroxenes. The in situ analysis of fresh clinopyroxenes from these rocks provides essential information about their parental magmas and mantle sources. Here, we present in situ major and trace element compositions of clinopyroxenes from these rocks
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The pyroclastic breccias from Cabezo Negro de Tallante (SE Spain): Is there any relation with carbonatitic magmatism? Lithos (IF 3.39) Pub Date : 2021-03-29 Francesca Innocenzi, Sara Ronca, Samuele Agostini, Marco Brandano, Antonio Caracausi, Michele Lustrino
The small Plio-Quaternary volcanic centre of Cabezo Negro de Tallante in SE Spain includes a thick deposit of polymictic pyroclastic tuff-breccia, whose fragments are agglutinated by a carbonate-rich component. This feature is also observed in other monogenetic volcanic centres cropping out in the Tallante-Cartagena volcanic district. The carbonate fraction has been recently interpreted in literature
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40Ar/39Ar ages and bulk-rock chemistry of the lower submarine units of the central and western Aleutian Arc Lithos (IF 3.39) Pub Date : 2021-04-03 Rachel Bezard, Kaj Hoernle, Jörg A. Pfänder, Brian Jicha, Reinhard Werner, Folkmar Hauff, Maxim Portnyagin, Blanka Sperner, Gene M. Yogodzinski, Simon Turner
In order to further constrain the timing of the Aleutian Arc initiation as well as its early evolution, an extensive 40Ar/39Ar dating and geochemical (major and selected trace elements) campaign (40 samples) of the lower units of the Aleutian ridge has been carried out on samples dredged from deep fore-arc canyons and rear-arc tectonic structures. The new dataset slightly increases the minimum inception
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B isotopes reveal Eocene mélange melting in northern Tibet during continental subduction Lithos (IF 3.39) Pub Date : 2021-04-02 Lin Ma, Guo-Ning Gou, Andrew C. Kerr, Qiang Wang, Gang-Jian Wei, Jin-Hui Yang, Xiao-Ming Shen
Continental subduction is an important but poorly known means of transporting the Earth's crust into the mantle. Continental subduction has also been proposed to responsible for the formation of the Cenozoic intracontinental potassic rocks widespread in Tibet and uplift of the Tibetan Plateau. However, such ancient continental subduction only occasionally been identified and is controversial. In this
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Metamorphic evolution and Petrogenesis of garnet–corundum silica–undersaturated metapelitic granulites: A new case study from the Mianlüe Tectonic Zone of South Qinling, Central China Lithos (IF 3.39) Pub Date : 2021-04-08 X.-Y. Liao, L. Liu, M.-G. Zhai, S. Liang, W.-Q. Yang, L. Kang, Y.-S. Gai, C.-L. Zhang
Newly identified garnet–corundum silica-undersaturated pelitic granulites in the Mianlüe Tectonic Zone of the South Qinling belt, central China, preserve a distinct mineral assemblage of garnet + corundum + biotite + plagioclase ± kyanite + sillimanite + staurolite and are therefore useful for deciphering the metamorphic evolution of the zone. Most of the garnet porphyroblasts preserve prominent major-
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Geochemistry and U-Pb-Lu-Hf zircon isotopes of Cu (±Au ± Mo) hosted granitoids of Malanjkhand pluton, Central India: Implications on petrogenesis, source, and crustal evolution Lithos (IF 3.39) Pub Date : 2021-04-09 Deepa Arya, Saurabh Gupta, Santosh Kumar, Xisheng Xu
The early Paleoproterozoic granitoids (2.45–2.5 Ga) at Malanjkhand and surrounding regions, referred herein to as Malanjkhand granitoids (MG), host Cu (±Mo ± Au) deposit. The MG lie in the south of Central Indian Tectonic Zone (CITZ), forming an integral part of the Bastar Craton. Whole-rock geochemistry, zircon U-Pb-Lu-Hf isotopes of MG are presented with an aim to insight into petrogenesis of MG
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Petrogenesis of coeval shoshonitic and high-K calc-alkaline igneous suites in the Eopyeong granitoids, Taebaeksan Basin, South Korea: Lithospheric thinning-related Early Cretaceous magmatism in the Korean Peninsula Lithos (IF 3.39) Pub Date : 2021-03-26 Sunghwan Im, Jung-Woo Park, Jihyuk Kim, Seon-Gyu Choi, Mi Jung Lee
The Early Cretaceous was the initial period of prolonged Cretaceous-Tertiary magmatic episode in the Korean Peninsula, during which a tectonic transition from compression to extension occurred. The Early Cretaceous Eopyeong granitoids in the Taebaeksan Basin consist of two distinct series of magmas: shoshonitic and high-K calc-alkaline series. We investigated the petrology, whole-rock major and trace
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Late Jurassic–Early Cretaceous irregular slab rollback of paleo-Pacific plate beneath southeastern China: Insights from the petrogenesis of volcanic rocks of Moshishan Group in Dazhou volcanic basin, Gan-Hang Belt Lithos (IF 3.39) Pub Date : 2021-03-27 Shui-Yuan Yang, Jia-Peng Liang, Shao-Yong Jiang, Xing Zhang, Ruo-Xi Zhang
The geodynamic model of the paleo-Pacific plate subduction beneath southeastern China during the Late Mesozoic, though generally accepted, remains controversial with respect to the exact plate subduction model. The Moshishan Group volcanic strata are well developed in the Dazhou volcanic basin in the Gan-Hang Belt (GHB). In this study, detailed investigations on geochronology, elemental geochemistry
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Petrological insights on the last 1000 years of explosive activity at La Soufrière volcano, St. Vincent (Lesser Antilles) Lithos (IF 3.39) Pub Date : 2021-04-03 Lorenzo Fedele, Paul D. Cole, Claudio Scarpati, Richard E.A. Robertson
The petrological features of scoria samples and enclosed holocrystalline xenoliths from the last ~1000 years of activity of the La Soufrière volcano of St. Vincent (Lesser Antilles) are described in detail here. The products of the investigated prehistoric eruptions (pre-1440, 1440, 1580 CE) are relatively homogeneous basaltic andesites (with a paragenesis consisting of plagioclase, clinopyroxene,
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Repeated extraction of aphyric melts in a rhyolitic system revealed by zircon age and composition: The Ramadas Volcanic Centre (Puna plateau), NW Argentina Lithos (IF 3.39) Pub Date : 2021-03-31 L. Bardelli, R. Becchio, A. Ortíz, A.K. Schmitt, R. Pereira, W. Báez, F. Reckziegel, J. Viramonte, G. Giordano
Rhyolitic volcanism can provide important information about the mechanisms by which highly-evolved crystal-poor melts can be extracted from silicic crystal-mush reservoirs. In the Altiplano-Puna plateau (Central Andes), rhyolites are volumetrically less abundant than the high-volume, crystal-rich intermediate products emitted during the ignimbritic flare-up (ca. 10–1 Ma), and their geological and temporal
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Multi-phase tectonothermal evolution in the SE Chinese Altai, central Asia: Structures, U-Pb monazite ages and tectonic implications Lithos (IF 3.39) Pub Date : 2021-04-03 Kang Xu, Yingde Jiang, Sheng Wang, Tan Shu, Zhi-Yong Li, Stephen Collett, Chao Yuan, Ling-Zhu Kong
The tectonothermal evolution of the interior of the vast Central Asian Orogenic Belt (CAOB) is poorly understood. In this study, detailed structural observation, combined with petro-structural analysis and U-Pb monazite geochronological investigation were conducted in the southeastern Chinese Altai, aiming to decipher the Paleozoic tectonic evolution of the heartland of the CAOB. The study area is
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Origin of highly fractionated peraluminous granites in South China: Implications for crustal anatexis and evolution Lithos (IF 3.39) Pub Date : 2021-04-03 Yanjiao Chen, Bin Chen, Xiaoxia Duan, He Sun
Voluminous Mesozoic intra-continental granitic rocks occur in South China, which provide insights into the processes and associated P-T conditions of crustal anatexis and evolution in an intra-continental setting. Most granitic plutons contain multiple phase intrusions, commonly with an early-stage main-phase granite and a late-stage minor-phase highly fractionated granite, and the latter is generally
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Petrogenesis of the late Mesozoic Bashan complex in the Lower Yangtze River Belt, eastern China: Implications for the definition and significance of A-type granite Lithos (IF 3.39) Pub Date : 2021-03-31 Chao Yang, Jun Yan, Sinuo Wang, Shiming Song, Dingyuan Zhang, Jianmin Liu
Many late Mesozoic granites within the Lower Yangtze River Belt (LYRB), eastern China, are defined as A-types based on their geochemical characteristics, although their petrogenesis is unclear. We present an integrated study combining geochronology, whole-rock geochemistry, Sr, Nd, Pb and zircon Hf isotopes and mineral chemistry for a lithologically-diverse suite of A-type granitoids at Bashan. The
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Insights into OIB-like magmatism contemporaneous with oceanic subduction: Petrogenetic constraints on the Kendelong metagabbro in the North Qaidam Lithos (IF 3.39) Pub Date : 2021-03-23 Xiangyu Gao, Shengyao Yu, Yinbiao Peng, Pei Lv, Meng Wang, Yongjiang Liu, Sanzhong Li, Xingzhou Jiang, Wentao Ji, Chuanzhi Li
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Mantle source and magma oxygen fugacity of Permian Ni--Cu sulfide-bearing mafic-ultramafic intrusions in the Inner Mongolia, North China: Controls on the sulfide saturation of magmas in the Andean-style continental convergent margins Lithos (IF 3.39) Pub Date : 2021-03-16 Yonghua Cao, Christina Yan Wang, Bo Wei, Hongtian Bao
Permian Erbutu and Kebu Ni--Cu sulfide-bearing mafic-ultramafic intrusions in the central Asian orogenic belt (CAOB) formed in the Andean-style continental convergent margin adjacent to the northern margin of the North China Craton (NCC). The rocks of the two intrusions show arc-like affinity on the primitive mantle-normalized trace element patterns and have εNd(t) ranging from −8.7 to −4.2, which
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Helium isotopes and olivine geochemistry of basalts and mantle xenoliths in Jeju Island, South Korea: Evaluation of role of SCLM on the Cenozoic intraplate volcanism in East Asia Lithos (IF 3.39) Pub Date : 2021-03-20 Donghwan Kim, Hyunwoo Lee, Wonhee Lee, Jonguk Kim, Jihye Oh, Jung-Hun Song, Haemyeong Jung, Finlay M. Stuart
Jeju Island, South Korea, is a Cenozoic intraplate volcano located in East Asia. The Jeju basalts display ocean island basalt (OIB)-like trace element patterns and enriched mantle type 2 (EM2) radiogenic isotope compositions, but the source that enriched the mantle remains unclear. Here we report new geochemical compositions of basalts and xenoliths, including the first helium isotope and element analysis
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Important role of magma mixing in generating the Late Cretaceous Shima intrusion along the Middle-Lower Yangtze River belt: Evidence from petrology, geochemistry, and zircon U-Pb-Hf isotopes Lithos (IF 3.39) Pub Date : 2021-03-27 Yang Sun, Changqian Ma, Bin Liu
Mafic microgranular enclaves (MMEs) are common in the granodiorites from the Shima intrusion in the Ningzhen region of the Middle-Lower Yangtze River belt (MLYRB). In this paper, we report new zircon U-Pb ages, mineral and whole rock geochemical and Sr–Nd–Hf isotopic data for the Shima MMEs and their host granodiorites to constrain their petrogenesis and tectonic implication. Zircon LA-ICP-MS U-Pb
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Clarifying source assemblages and metasomatic agents for basaltic rocks in eastern Australia using olivine phenocryst compositions Lithos (IF 3.39) Pub Date : 2021-03-19 Zairong Liu, Joshua J. Shea, Stephen F. Foley, Yannick Bussweiler, Arno Rohrbach, Stephan Klemme, Jasper Berndt
Many Cenozoic basaltic rocks in Eastern Australia exhibit an age-progressive trend from north to south, leading to the suggestion that one or more mantle plumes passed beneath the Australian plate. Trace element patterns indicate that the source regions have been metasomatised by infiltrating melts, but the source rock assemblages have never been closely identified. Here, trace element analyses of
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Middle–late Permian mantle plume/hotspot–ridge interaction in the Sumdo Paleo-Tethys Ocean region, Tibet: Evidence from mafic rocks Lithos (IF 3.39) Pub Date : 2021-03-24 Bin Wang, Chao-Ming Xie, Yong-Sheng Dong, Jian-Jun Fan, Yun-Peng Yu, Meng-Long Duan
The Sumdo Paleo-Tethys Ocean was the southernmost part of the Paleo-Tethys Ocean and was located on the Qinghai–Tibet Plateau. Doubts exist as to the internal dynamics and evolution of the Sumdo Paleo-Tethys Ocean region during the Permian, owing to insufficient knowledge regarding the remnants of oceanic crust. Here, we report results for petrology, laser ablation–inductively coupled plasma–mass spectrometry
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Multi-stage garnet formation and destruction in Kimberley harzburgitic xenoliths, South Africa Lithos (IF 3.39) Pub Date : 2021-03-20 Matteo Branchetti, Jonathan C.O. Zepper, Siem T.J. Peters, Janne M. Koornneef, Gareth R. Davies
Thirty-nine garnet harzburgites from Kimberley in the Kaapvaal Craton (South Africa) were studied to constrain the origin, age and evolution of sub-cratonic lithospheric mantle (SCLM). In order to avoid chemical overprinting by recent metasomatism, only garnet harzburgites that appeared clinopyroxene-free to the naked eye were sampled. The majority of garnets were, however, in equilibrium with clinopyroxene
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Enhancing strength-ductility of the aluminum bronze alloy by generating high-density ultrafine annealing twins Lithos (IF 3.39) Pub Date : 2021-03-29 Shuo Ma, Liming Fu, Aidang Shan
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H2O-fluxed melting of eclogite during exhumation: an example from the eclogite type-locality, Eastern Alps (Austria) Lithos (IF 3.39) Pub Date : 2021-03-24 Simon Schorn, Michael I.H. Hartnady, Johann F.A. Diener, Chris Clark, Chris Harris
Epidote eclogites embedded in paragneisses from the Austrian Eastern Alps host rare, decimetre- to metre-sized planar pegmatitic segregations (‘pegmatoids’) that consist of a hornblende–plagioclase–epidote–titanite–quartz assemblage. The pegmatoids cut the primary eclogite foliation at a high angle, show abrupt terminations and exhibit numerous microtextures indicating the former presence of melt,
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Petrology and geochemistry of the Texenna ophiolites, northeastern Algeria: Implications for the Maghrebian flysch suture zone Lithos (IF 3.39) Pub Date : 2021-02-01 El Hachemi Boukaoud, Gaston Godard, Moulley Charaf Chabou, Youcef Bouftouha, SidAli Doukkari
This study presents the first geochemical, mineralogical and petrological data on the mafic and ultramafic rocks of Texenna (Lesser Kabylia, north-eastern Algeria) with the aim of constraining their tectonic setting in the context of the Maghrebide belt. The magmatic-sedimentary complex of Texenna comprises serpentinite, metabasites (metagabbro, metadolerite and metabasalt with pillow-lava structures)
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Phlogopite-rich and phlogopite-poor kimberlite intrusions within the Du Toitspan kimberlite pipe, South Africa: Petrogenetic relationships and localised source heterogeneity Lithos (IF 3.39) Pub Date : 2021-03-23 Lesego Ramokgaba, Anton le Roex, Jock Robey
Samples from three petrographically distinct, intrusive kimberlite bodies and associated kimberlite dykes from the eastern lobe of the Du Toitspan kimberlite pipe, Kimberley, South Africa, have been analysed for their bulk rock major and trace element compositions and their olivine and phlogopite compositions. The two dominant intrusive bodies (D13, D14) are distinguished by the one (D13) being phlogopite-rich
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Evidence for widespread mid-Permian magmatic activity related to rifting following the Variscan orogeny (Western Carpathians) Lithos (IF 3.39) Pub Date : 2021-03-05 Gabriel Villaseñor, Elizabeth J. Catlos, Igor Broska, Milan Kohút, Ľubomír Hraško, Kimberly Aguilera, Thomas M. Etzel, J. Richard Kyle, Daniel F. Stockli
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Reworking of juvenile crust beneath the Bangong–Nujiang suture zone: Evidence from Late Cretaceous granite porphyries in Southern Qiangtang, Central Tibet Lithos (IF 3.39) Pub Date : 2021-03-08 Zi-Long Wang, Jing-Jing Fan, Qiang Wang, Wan-Long Hu, Zong-Yong Yang, Jun Wang
Crustal reworking in the collisional zones is commonly considered as an important process to result in continental crust differentiation and maturation. However, the reworking mechanism remains unclear. Here, a combined study of zircon SIMS U–Pb age, whole-rock major and trace element, Sr–Nd–Hf and zircon Hf–O isotopic geochemistry was carried out for the Duoma–Namuqie (DM–NMQ) granite porphyry intrusions
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Heavy magnesium isotopes in the Gangdese Magmatic Belt: Implications for magmatism in the Mesozoic subduction system of southern Tibet Lithos (IF 3.39) Pub Date : 2021-03-15 Yuanku Meng, Haoqi Yuan, M. Santosh, Walter D. Mooney, Lei Guo
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Alkaline granitic magmatism of the Western Transbaikalia: Petrogenetic and geodynamic implications from U-Pb isotopic–geochronological data Lithos (IF 3.39) Pub Date : 2021-03-13 A.A. Tsygankov, V.B. Khubanov, O.V. Udoratina, M.A. Coble, G.N. Burmakina
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Age and provenance of the lithospheric mantle beneath the Chidliak kimberlite province, southern Baffin Island: Implications for the evolution of the North Atlantic Craton Lithos (IF 3.39) Pub Date : 2021-03-23 Yong Xu, D. Graham Pearson, Garrett A. Harris, Maya G. Kopylova, Erica Tso, Jingao Liu
A suite of peridotite xenoliths from the Chidliak kimberlite province provides an ideal opportunity to assess the age of the mantle lithosphere beneath the eastern Hall Peninsula Block (EHPB) in southern Baffin Island, Nunavut and to provide constraints on the lithospheric architecture of this region. The new dataset comprises highly siderophile element (HSE) abundances and ReOs isotopic compositions
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The spatial and temporal evolution of primitive melt compositions within the Lac de Gras kimberlite field, Canada: Source evolution vs lithospheric mantle assimilation Lithos (IF 3.39) Pub Date : 2021-03-27 Madeline Tovey, Andrea Giuliani, David Phillips, D. Graham Pearson, Chiranjeeb Sarkar, Tom Nowicki, Jon Carlson
Kimberlites are the deepest-derived magmas and can provide unique insights into the composition and evolution of the deep Earth. However, this is hindered by contamination of kimberlite melts by mantle and crustal material during ascent. Previous work has shown that the Nd and Hf isotope compositions of the 47–75 Ma Lac de Gras (LDG) kimberlites (western Canada) evolve with time from geochemically
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Elemental and Nd isotopic compositions of zoned titanite in mafic microgranular enclaves of the Early Cretaceous Sanguliu granitic pluton in the North China Craton: Insights into magma mixing process Lithos (IF 3.39) Pub Date : 2021-03-27 Zisong Zhao, Christina Yan Wang, Bo Wei, Jingzhao Dou
Widespread Mesozoic granitic plutons in the North China Craton (NCC) are products of remelting of the crust associated with large-scale Mesozoic destruction of the NCC. Mafic microgranular enclaves (MMEs) are common in these plutons and are attributed to magma mixing. However, the involved magmatic processes of the mixing are poorly known. In this paper, we reported complex zoning patterns, in situ
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Mapping tectono-metamorphic discontinuities in orogenic belts: Implications for mid-crust exhumation in NW Himalaya Lithos (IF 3.39) Pub Date : 2021-03-26 Beatriz Benetti, Chiara Montomoli, Salvatore Iaccarino, Antonio Langone, Rodolfo Carosi
A newly identified high-temperature shear zone, the Badrinath shear zone (BSZ), is described within the metamorphic core of the Himalayan belt along the Alaknanda valley, Garhwal Himalaya (NW India). A multidisciplinary approach comprising fieldwork, microstructural analyses, petrology and in situ monazite geochronology was addressed to this high-strain zone to better understand its role in the Greater
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Local variations of metamorphic record from compositionally heterogeneous rocks (Cima di Gagnone, Central Alps): Inferences on exhumation processes of (U)HP–HT rocks Lithos (IF 3.39) Pub Date : 2021-03-20 Stefania Corvò, Matteo Maino, Antonio Langone, Filippo Luca Schenker, Sandra Piazolo, Leonardo Casini, Silvio Seno
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Cryptic zoning in primitive olivine as an archive of mush fluidization at mid-ocean ridges Lithos (IF 3.39) Pub Date : 2021-03-18 Fan Yang, Xiao-Long Huang, Yi-Gang Xu, Peng-Li He
Processes operating within magmatic crystal mushes exert a fundamental control on the physical and chemical evolution of mid-ocean ridge systems. It is widely recognized that mush fluidization in response to magma recharge could produce variable compositional zoning in crystals. However, olivines generally show relatively smooth MgFe zoning in comparison with complex and short-length scale zoning in
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Transformation from oxidized to reduced alkaline magmas in the northern North China Craton Lithos (IF 3.39) Pub Date : 2021-03-15 Kaizhang Yu, Yongsheng Liu, Stephen F. Foley, Yangtao Zhu, Zhaochu Hu, Keqing Zong, Haihong Chen
The oxygen fugacity of a magma controlling element distribution and mobility is influenced by multiple factors including source composition and magmatic processes (e.g., assimilation and degassing). Here, whole-rock and in situ mineral analyses of the alkaline complex from the northern North China Craton are reported to investigate the influence of source composition and magmatic processes on the evolution
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Bimodal volcanic rocks in the northeastern margin of the Yangtze Block: Response to breakup of Rodinia supercontinent Lithos (IF 3.39) Pub Date : 2021-03-18 Xiaoyu Yuan, Manlan Niu, Qianru Cai, Qi Wu, Guang Zhu, Xiucai Li, Yi Sun, Chen Li
Mid-Neoproterozoic protoliths of high–ultrahigh-pressure metamorphic rocks in the northeastern margin of the Yangtze Block preserve one of the best examples of 18O-depleted magmatic provinces worldwide, which is the significant record for lithospheric extension associated with continental rifting. In this contribution, we report the depleted 18O signature of felsic meta-volcanic rocks from the Zhangbaling
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Geochemistry and zircon UPb geochronology of Late Mesozoic igneous rocks from SW Vietnam – SE Cambodia: Implications for episodic magmatism in the context of the Paleo-Pacific subduction Lithos (IF 3.39) Pub Date : 2021-03-16 Anh T.Q. Nong, Christoph A. Hauzenberger, Daniela Gallhofer, Sang Q. Dinh
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The Neoproterozoic to Triassic tectonic evolution of Jangbong Island in the northwestern Gyeonggi Massif on the Korean Peninsula Lithos (IF 3.39) Pub Date : 2021-03-16 Ji Wan Jeong, Chang Whan Oh, Deung-Lyong Cho
Jangbong Island is located in the coastal area of the northwestern Gyeonggi Massif, and its basement is composed of Paleoproterozoic gneiss. The basement is covered by Neoproterozoic metasedimentary rocks such as pelitic schist, calc-schist, and quartz schist. These rocks are intruded by mafic dikes metamorphosed under amphibolite facies conditions. In the study area, two different metamorphic conditions
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Multi-stage mantle accretions and metasomatisms related to peripheral subduction or collision in the northern North China Craton: Evidence from the Nangaoya peridotite xenoliths Lithos (IF 3.39) Pub Date : 2021-03-17 Xiao Bian, Yuping Su, Jianping Zheng, Qing Xiong, Xiang Zhou, Hongkun Dai, Abing Lin, Jian Wang, Liang Zhou
Peridotite xenoliths from the northern North China Craton (NCC) are characterized by lithological and chemical heterogeneity, related to mantle accretion and metasomatism. However, the accretion mechanism and origin of metasomatic agent are contentious. Here, we report the petrology, whole-rock major elements and ReOs isotopes, and in situ mineral major- and trace-elements as well as Sr isotopic compositions
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Crustal thickening of the western Tibetan Plateau during the Early Cretaceous: Evidence from adakitic granodiorites, leucogranites, and monzogranites in the Songxi area, western Qiangtang Terrane Lithos (IF 3.39) Pub Date : 2021-03-17 Qiang Ke, Tao Hong, Xing-Wang Xu, Hao Li, Xiao-Xue Tong, Lian-Hui Dong, Ting-Bin Fan, Hang Li, Yu-Hao Li
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Genesis and age of Pb−Zn mineralization from the Ningi-Burra ring complex, North Central Nigeria: Constraints from zircon morphology, U−Pb dating and Lu−Hf isotopes Lithos (IF 3.39) Pub Date : 2021-03-16 Victor Ikechukwu Vincent, Huan Li, Musa Bala Girei, Hafizullah Abba Ahmed, Eyo Eyo Ntekim
The Ningi-Burra Pb−Zn mineralization forms part of the Nigerian Sn-Nb ± (Pb-Zn-Mo)-rich anorogenic alkaline province, also known as the Nigerian Younger Granite Complexes. Six distinct E-W trending magmatic centres have been identified in the Ningi-Burra complex, but the Pb−Zn mineralization is confined to highly evolved biotite granite in Koluki (centre 6). In this paper, a combination of geochronological
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Some trace element ratios hardly modify during metamorphism of pelitic granulites as evidencd from the Highland Complex, Sri Lanka Lithos (IF 3.39) Pub Date : 2021-03-20 Sanjeewa P.K. Malaviarachchi, Prasanna L. Dharmapriya
Earth's deep crustal granulites, in particular, metamorphosed clastic sedimentary rocks, are important to decode the composition of the pelitic lower crust. General understanding is that granulite-facies metamorphism extensively removes trace elements from the protolith sediments, resulting their high depletion in newly generated granulites. However, there has been no systematic appraisal on the budget
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Barium isotope evidence for recycled crustal materials in the mantle source of continental basalts Lithos (IF 3.39) Pub Date : 2021-03-16 Yue-Peng Zhao, Yan-Jie Tang, Juan Xu, Zhen Zeng, Ji-Feng Ying, Heng-Ci Tian, Fang Huang
To investigate the potential of using Barium (Ba) isotopes to trace recycled crustal materials, we report high-precision Ba isotopic compositions for 22 well-characterized samples of Cenozoic basalts from the Taihang Mountains, North China Craton. The basalts have δ138/134Ba [= (138Ba/134Basample/138Ba/134BaSRM3104a – 1) × 1000] of −0.06‰ to +0.03‰(±0.05‰,2SD), lower than the depleted upper mantle
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Zircon U–Pb geochronology and geochemistry of the Lajimiao mafic complex in the Shangdan Suture Zone, Qinling orogen: Petrogenesis and tectonic implications Lithos (IF 3.39) Pub Date : 2021-03-16 Huan Chang, Yuanbao Wu, Guangyan Zhou, Wenxiang Zhang, Yu He, Zhao Yujie, Pan Hu, Zhaochu Hu
The Shangdan Ocean represents the eastern branch of the Proto-Tethys Ocean, which is important to decipher the evolution of the Central China Orogenic Belt. However, its evolution is still in debated. In this contribution, we carried out an integrated study of zircon UPb ages, whole-rock geochemistry, as well as zircon HfO isotope compositions for the Lajimiao mafic complex in the Shangdan Suture Zone
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Origin of Permian mafic intrusions in southern Chinese Altai, Central Asian Orogenic Belt: A post-collisional extension system triggered by slab break-off Lithos (IF 3.39) Pub Date : 2021-03-16 Xing Cui, Min Sun, Guochun Zhao, Yunying Zhang
Distinct types of mafic rocks, including gabbro-norite, gabbro-diorite, and monzogabbro-diorite, are exposed in the southern Chinese Altai. Zircon U-Pb dating of these intrusions reveals that they were emplaced at ca. 283–275 Ma. Geochemical data show that these intrusions are characterized by low Ce/Pb (3.1–10.3), low Nb/U (5.5–38.9), and high Th/Yb (0.4–2.4) ratios. They are slightly LREE enriched
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Petrography, mineralogy, and geochemistry of the Hemrin Basalt, Northern Iraq: Implications for petrogenesis and geotectonics Lithos (IF 3.39) Pub Date : 2021-03-15 Yawooz A. Kettanah, Alan S. Abdulrahman, Sabah A. Ismail, Daniel J. MacDonald, Heider Al Humadi
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Petrogenesis and tectonic implications of the late Paleoproterozoic A-type rhyolites at the southwestern North China Craton Lithos (IF 3.39) Pub Date : 2021-03-08 Lanyin Pang, Yanyan Zhou, Xinyu Gao, Xiaoqin Deng, Junhong Zhao, Taiping Zhao
The late Paleoproterozoic A-type granitoids are important for constraining of the lithotectonic and geodynamic processed involved in the creation of continental crust. The newly identified late Paleoproterozoic felsic extrusive rocks from the southwestern margin of the North China Craton (NCC) consist of rhyolites which show melting corrosion structure, autoclastic texture and fiber structure of mineral
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Early Permian continental arc magmatism in the Zhaojinggou area of the northern North China Craton: Implications for crust-mantle interactions during southward Paleo-Asian plate subduction Lithos (IF 3.39) Pub Date : 2021-03-15 Lu Zhang, Shao-Yong Jiang
Early Permian magmatism in the Zhaojinggou area of Inner Mongolia, northern China produced intrusive gabbroic diorite and granites including biotite granite, K-feldspar granite and fine-grained granite. We present zircon U–Pb geochronology, whole-rock geochemistry, and Sr–Nd–Hf isotopic compositions of these rocks to resolve complex crust–mantle processes beneath the northern margin of the North China
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The ~ 1.87 Ga granulite facies metamorphism of the South Liaohe Group in the Jiao-Liao-Ji Belt and its tectonic implications Lithos (IF 3.39) Pub Date : 2021-03-18 Xiaohan Wang, Chang Whan Oh, Xinping Wang, Mingguo Zhai, Lei Zhao
To further understand the metamorphic evolution in the southern margin of the Jiao-Liao-Ji Belt in the Liaodong area, a detailed petrological and geochronological study was performed on representative metapelites from the South Liaohe Group. The peak metamorphic stage (M1) of the samples is represented by the mineral assemblage of garnet-biotite-plagioclase-sillimanite-quartz-magnetite in sample DD24-1
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Petrogenesis of Early Cretaceous granitoids and mafic microgranular enclaves from the giant Tonglushan Cu–Au–Fe skarn orefield, Eastern China Lithos (IF 3.39) Pub Date : 2021-03-18 Shitao Zhang, Qiang Ma, Huayong Chen, Xiaoping Long, Gaobin Chu, Weifeng Zhang, Jiamin Cheng, Jing Tian
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Magmatic cannibalisation of a Permo-Triassic Ni-Cu-PGE-(Au-Te) system during the breakup of Pangea – Implications for craton margin metal and volatile transfer in the lower crust Lithos (IF 3.39) Pub Date : 2021-03-08 Joshua Chong, Marco L. Fiorentini, David A. Holwell, Marilena Moroni, Daryl E. Blanks, Gregory M. Dering, Alison Davis, Elena Ferrari
The Ivrea Zone of NW Italy records the polyphased evolution of a magmatic sulfide mineral system, which occurred at multiple stages over a >80 Ma time interval. Between 290 and 250 Ma, a series of hydrated and carbonated ultramafic alkaline pipes containing Ni-Cu-PGE-(Te-Au) mineralisation was emplaced in the lower continental crust. At 200 Ma, a subsequent mineralising event occurred in association
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