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Plagioclase as archive of the incremental assembly of the Quxu batholith, South Tibet: Implication for the nature of magma reservoir Lithos (IF 3.5) Pub Date : 2024-03-08 Bing Ruan, Biji Luo, Hongfei Zhang, Xinfu Zhao, Chao Zhang, He Yang, Wangchun Xu, Fabin Pan, Liang Guo
The formation of magma reservoir and resultant construction of large batholith are increasingly recognized as long-term incremental processes. Here we employed back-scattered electron and cathodoluminescence images, in-situ major and trace elements, and Sr isotopes of plagioclase for five lithological groups from the Quxu complex batholith (south Tibet), which shed new light on the nature and incremental
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Bimodal volcanism in the Hegau region (SW Germany): Differentiation of primitive melilititic to nephelinitic rocks produces evolved nosean phonolites Lithos (IF 3.5) Pub Date : 2024-03-07 Thomas Binder, Michael A.W. Marks, Brian-Eric Friedrichsen, Benjamin F. Walter, Thomas Wenzel, Gregor Markl
Peculiar bimodal volcanism in the Hegau region (SW Germany) comprises two contrasting SiO-undersaturated rock suites.
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Reworking and maturation of continental crust in collision zones: Insights from Early Cretaceous compositionally diverse magmatic rocks in central Tibet Lithos (IF 3.5) Pub Date : 2024-03-07 Wan-Long Hu, Qiang Wang, Jin-Hui Yang, Lu-Lu Hao, Gangjian Wei, Yue Qi, Jun Wang, Zong-Yong Yang, Peng Sun
The reworking of continental crust in collision zones is a key process in the chemical maturation of crustal rocks. However, the mechanisms that cause crustal reworking remain highly controversial. The compositionally diverse magmatic rocks along the Lhasa–Qiangtang collision zone provide a favorable opportunity for studying the mechanism of crustal reworking and maturation in continental collision
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Post-collisional magmatism and local lithospheric thinning in the Neoproterozoic Alto Pajeú Domain, northeastern Brazil: Geochemical and isotopic evidence Lithos (IF 3.5) Pub Date : 2024-03-07 Diego H. Ardila, Valderez P. Ferreira, Bianca T.A. Lima, Alcides N. Sial, Charles H.F.S. Neves, Renan Siqueira
The 595–560 Ma post-collisional magmatism in the Alto Pajeú Domain, Borborema Province, northeastern Brazil, is characterized by the intrusion of voluminous high-K calc-alkaline, shoshonitic and ultrapotassic magmas. The nature of the source rocks and the geodynamic context associated with the generation and emplacement of this post-collisional magmatism is still enigmatic. In this study, we report
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Carbonate metasomatism in sub-continental lithospheric mantle: Insights from decoupled Nd[sbnd]Hf isotopes of Mesozoic gabbros in Jinan, eastern North China Craton Lithos (IF 3.5) Pub Date : 2024-03-07 Jun Guo, Xiao-Long Huang, Le Zhang, Jun-Wei Zhong
The ancient sub-continental lithospheric mantle (SCLM) of the eastern North China Craton (NCC) underwent metasomatism in the Triassic due to fluids derived from subducted Yangtze continental crust, followed by further metasomatism during the Jurassic–Cretaceous caused by fluids originating from subducted Paleo-Pacific oceanic slabs. However, the occurrence of carbonate metasomatism during these two
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Early Cretaceous magmatism archives crustal architecture of northern Lhasa Terrane, central Tibetan Plateau Lithos (IF 3.5) Pub Date : 2024-03-06 Wan-Li Tang, Feng Huang, Zheng-Wei Qin, Yun-Chuan Zeng, Ji-Feng Xu
Identification of continental crustal architecture in orogenic belts is essential for understanding the geodynamic evolution of global continental collision systems. However, ongoing debates surrounding the crustal nature of the Lhasa Terrane in the central Tibetan Plateau impede our comprehension of its tectonic evolution. Mesozoic intermediate-felsic magmatism in the Lhasa Terrane offers key insights
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Subduction of the Sumdo Paleo-Tethys Oceanic Lithosphere and evolution of the Lhasa Terrane: Inspiration from Middle Triassic Magmatism in Sumdo, Tibet Lithos (IF 3.5) Pub Date : 2024-03-01 Meng-Long Duan, Chao-Ming Xie, Yu-Hang Song, Bin Wang, Yu-Jie Hao, Jia-Jun Zhang
Owing to the impact of the Paleo-, Meso-, and Neo-Tethys Oceans, the Triassic evolution of the Lhasa Terrane is complex and remains debated. The little-known subduction of the oceanic lithosphere of the Sumdo Paleo-Tethys Ocean (SPTO) in the Triassic has especially constrained our understanding of the evolution of the Lhasa Terrane. We investigated the newly identified Triassic granite and metabasalt
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Single-zircon U[sbnd]Pb geochronology and petrogenesis of Pan-African granitoids associated with gold-bearing quartz veins in the Ngoura-Colomines area, Eastern Cameroon Lithos (IF 3.5) Pub Date : 2024-02-29 Jonas Didero Takodjou Wambo, Arkadeep Roy, Sylvestre Ganno, Donald Hermann Fossi, Oliver D. Wilner, Jean Paul Nzenti, Paul D. Asimow
LA-ICP-MS zircon UPb geochronology was combined with field study, petrography, and whole rock geochemical data to constrain the age of the Ngoura-Colomines granitoid plutons in the central domain of the Pan-African North Equatorial Fold Belt (PANEFB) in Cameroon and to define the relationship between the plutons and gold mineralization in the area. In the field, small plutons of biotite granite, megacrystic
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Magmatism and metasomatism in the formation of the Katugin Nb-Ta-REE-Zr-cryolite deposit, eastern Siberia, Russia: Evidence from zircon data Lithos (IF 3.5) Pub Date : 2024-02-29 Anastasiya E. Starikova, Anna G. Doroshkevich, Eugene V. Sklyarov, Tatyana V. Donskaya, Dmitriy P. Gladkochub, Elena O. Shaparenko, Irina A. Zhukova, Dina V. Semenova, Elizaveta S. Yakovenko, Alexey L. Ragozin
The world-class Katugin deposit (Eastern Siberia, Russia) in the high-F alkaline granite of the Katugin complex is located within the Early Proterozoic Stanovoy orogenic belt on the southeastern periphery of the Siberian craton. The deposit stores economic amounts of Nb, Y, Zr, REE, Ta, Th, U, and cryolite. Its formation was previously interpreted in terms of a single-stage model, but new zircon data
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Early Paleocene diorite and bimodal dykes from the Dagze region, southern Lhasa Terrane: Tectonic implications for the late-stage of Neo-Tethyan subduction Lithos (IF 3.5) Pub Date : 2024-02-28 Yan Tang, Zhidan Zhao, Xiaowei Li, Zhenzhen Wang, Ningyuan Qi, Dong Liu, Qing Wang, Xuanxue Mo
The tectonic transition from oceanic subduction to continental collision is a fundamental process during orogenesis. Yet, the nature of this transition and its deep geodynamic processes for the southern Tibetan Plateau remain contentious. This study presents zircon U-Pb-Hf isotopes, whole-rock geochemistry, and SrNd isotopes for a quartz diorite intrusion and bimodal dykes from Dagze, combined with
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Geochemical evidence for crustal anatexis during intra-orogenic transcurrent tectonics: Insights from Variscan peraluminous granites from the La Bazana Pluton (Ossa–Morena Zone, Iberian Massif) Lithos (IF 3.5) Pub Date : 2024-02-28 Jon Errandonea-Martin, Fernando Sarrionandia, Sonia García de Madinabeitia, Aratz Beranoaguirre, Manuel Carracedo-Sánchez, Idoia Garate-Olave, José Ignacio Gil Ibarguchi
Genetic models for granitoid formation in orogenic environments commonly entail varied mantle participation, with differentiation of mafic magmas typifying an end-member model if mantle input dominates over crustal anatexis. By departing from this model, diverse petrogenetic processes and combination thereof could also produce weakly peraluminous compositions in such domains, deriving in opposite implications
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Genesis and metallogenic potential of the ca.90 Ma Jiangcisha magmatic rocks in the western Shiquanhe suture zone, Xizang, China Lithos (IF 3.5) Pub Date : 2024-02-28 Baoliang Li, Huan Wang, Liqiang Wang, AaoRiGeLe Zhou, Teng Gao, Chenghao Ren
Numerous mineral deposits related to the ca.90 Ma magmatic activity were found in the northern and central Lhasa terrane. Recently, many Late Cretaceous intermediate and felsic magmatic rocks were discovered in the Jiangcisha area in the western Shiquanhe-Nam Tso Mélange Zone, separating the Lhasa terrane into northern and central subterranes. In this study, zircon UPb dating, whole-rock major and
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Garnet and zircon petrochronology reveal coherent subduction and exhumation of eclogites and associated schists in the Changning–Menglian orogenic belt, southeast Tibet Lithos (IF 3.5) Pub Date : 2024-02-20 Ying Zhou, Hao Cheng, Zhi-min Peng, Yu-zhen Fu, Kai-Yang Du
Determining whether high-grade metamorphic eclogites and surrounding metasediments underwent a shared subduction-exhumation cycle or distinct metamorphic paths before their juxtaposition at shallow levels is crucial for deciphering metamorphic processes in orogenic belts. Constructing pressure-temperature-time (t) paths for both rocks is the most straightforward approach. However, current time constraints
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Early Cretaceous intrusive rocks in the Gangdese arc of southern Tibet do not support shallow subduction of the Neo-Tethyan oceanic lithosphere Lithos (IF 3.5) Pub Date : 2024-02-19 Feng Wang, Qing Wang, Di-Cheng Zhu, Shi-Min Li, Peter A. Cawood, Rui-Qiang Wang, Jian-Kang Yi, Liang-Liang Zhang, Jin-Cheng Xie
The subduction geometry of the Neo-Tethyan oceanic lithosphere during the Early Cretaceous (i.e., shallow vs. steep subduction) remains in dispute due to the limited occurrence of the Early Cretaceous igneous rocks in the Gangdese arc. This study reports petrographical, zircon UPb geochronological, zircon Hf isotopic, whole-rock geochemical, and mineral geochemical data for the ultramafic-mafic and
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Early Paleozoic metamorphism and anatexis of lower retro−/back-arc crust in the western Central Qilian belt, NE Tibet Lithos (IF 3.5) Pub Date : 2024-02-16 Zun-pu Yu, Chao Wang, Nathan R. Daczko, Xiao-ying Liao, Hang Li, Xiao-kui Sun, Xiao-hui Zhu, Chao Shi
The tectonic-thermal mechanism of crustal melting provides vital information on continental differentiation and orogenic evolution. This study aims to understand the evolution and tectonic setting of newly discovered lower crustal leucosome-rich granulites of the Qilian Orogen, NW China. Tonalitic leucosome within garnet amphibolite occurs in net-like arrays or as stringers and has diffuse boundaries
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Identification of Indian crustal melting beneath Gangdese arc during India-Asia collision Lithos (IF 3.5) Pub Date : 2024-02-15 Shao-Xiong He, Christopher J. Spencer, Xiao-Chi Liu, Fangyang Hu, Jia-Min Wang, Wei-Qiang Ji, Fu-Yuan Wu
The continental collision between the Indian and Asian plates constitutes one of the most distinguished convergent systems on a global scale. Geophysical data have revealed that subducted Indian slab lies beneath the Lhasa terrane of the Asian plate. However, whether, when, and how the Indian continental crust contributed to the magmatism in the Lhasa terrane remain unclear. In this study, we present
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A layered gabbro-anorthosite suite from Attappadi: Chemical and isotopic signature of Neoarchean subduction tectonics in the Southern Granulite Terrane, India Lithos (IF 3.5) Pub Date : 2024-02-14 K.V. Kavyanjali, Y. Anilkumar, M. Santosh, Cheng-Xue Yang, K.S. Anoop, Anjana Mathew, Sanghoon Kwon
Archean layered complexes offer important windows into early Earth tectonic styles and continental crust building. The Dharwar Craton (3.3–2.7 Ga) in Southern India is bordered by Archean granulite facies crustal blocks and exposes some of the oldest rock suites that are archives of the Archean crust including the Niligiri Block where the major rock types include metapyroxenite, metagabbro, layered
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Subduction zone-related metasomatism of Devonian oceanic lithosphere: Evidence from mineralogical, geochemical, and O-H-Sr isotope characteristics of amphibole-bearing peridotites of the Sowie Mountain Block (SW Poland) Lithos (IF 3.5) Pub Date : 2024-02-13 Ahmed H. Ahmed, Mohamed M. Hamdy, Thomas C. Meisel
The serpentinized peridotite bodies found in gneisses of the Sowie Mountains Block (SMB) in the Central Sudetes of SW Poland (NE segment of the Bohemian massif) are significanly metasomatized. Mineral chemical and whole-rock geochemical data combined with Rb-Sr-Sm-Nd-O-H isotope data suggest that these peridotites are refractory oceanic mantle relics from supra-subduction zone to mid-ocean ridge. They
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Geochemical and isotopic constraints on the origin and evolution of the Matum-Das tonalite and mafic enclaves from the Kohistan Batholith, Northern Pakistan Lithos (IF 3.5) Pub Date : 2024-02-13 Mubasir Ali, Kui-Dong Zhao, Chao Wang, Hafiz U. Rehman, Amjad Hussain, Munazzam Ali Mahar, Muhammad Farhan, Wasiq Lutfi
Granitoids at subduction zones play a significant role in the generation and evolution of continental crust. The Kohistan Batholith in the Kohistan Island Arc is, in large part, comprised of granitoids with various sizes, amongst which the Matum-Das tonalitic pluton stands out as the most enigmatic due to its emplacement age and unique geochemical signatures. The genesis and formation mechanism of
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Rapid switch in geodynamic setting revealed by episodic granitoid magmatism in the Lynn Lake greenstone belt of Paleoproterozoic Trans-Hudson Orogen, Manitoba, Canada Lithos (IF 3.5) Pub Date : 2024-02-12 Xue-Ming Yang, Christopher J.M. Lawley
Bedrock geological mapping indicates that diverse granitoid intrusions occur closely in space and time in the Paleoproterozoic Lynn Lake greenstone belt of the Trans-Hudson Orogen, Manitoba, Canada. These intrusions display distinct geochemical characteristics of I-type, A-type and adakite-like granitoids as revealed by their respective alkalinity, alumina saturation state, and trace element concentrations
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Cenozoic crustal thickness variations and surface uplift in the southeastern Tibetan Plateau: Insights from detrital zircon trace elements in the Gongga Shan region Lithos (IF 3.5) Pub Date : 2024-02-11 Yanglin Zhao, Xiaoming Shen, Zhiyuan He, Xiong Wu, Yingying Jia, Xiudang Tang
The timing and mechanism of uplift in the southeastern Tibet Plateau have long been subjects of debate. The Gongga Shan region, positioned at the convergence of the Songpan-Ganzi, Chuandian, and Yangtze blocks, serves as a crucial vantage point for unraveling the evolutionary history of the southeastern Tibet Plateau. Nevertheless, the uplift history of the Gongga Shan region remains shrouded in uncertainty
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Reevaluating the oxidation effect of garnet crystallization Lithos (IF 3.5) Pub Date : 2024-02-10 Ming Tang, Jiazhen Wang, Cin-Ty A. Lee
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Petrogenetic link between leucogranite and spodumene pegmatite in Lhozhag, eastern Himalaya: Constraints from U–(Th)–Pb geochronology and Li–Nd–Hf isotopes Lithos (IF 3.5) Pub Date : 2024-02-08 Lei Yang, Jia-Min Wang, Xiao-Chi Liu, Fang-Yang Hu, Kang-Shi Hou, Jian-Gang Fu, Guang-Ming Li, Yu-Lu Tian, Fu-Yuan Wu
Rare-metal pegmatite represents the most differentiated magmatic system on earth, containing high concentrations of rare metals (Li, Rb, Cs, Be, Ta, Nb, and Sn) and fluxing components. Recent studies have shown that the Himalayan leucogranite–pegmatite system has considerable potential for rare-metal mineralization. A new spodumene pegmatite-type Li deposit (Gabo) was recently discovered in the Lhozhag
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A genetic linkage between refertilized mantle and REE enrichment in an alkaline-silicate system: A case of nepheline syenite in the Gejiu district, SW China Lithos (IF 3.5) Pub Date : 2024-02-08 Ye Zhou, Jia-Xi Zhou, Min Wang, Yu Miao, Yin Li, Ming-Xiao Li, Bo Xu
Alkaline-silicate rocks represent an important worldwide reservoir of rare earth elements (REE). The weathering of these alkaline-silicate rocks has the potential to create regolith-hosted REE deposits. The factors contributing to the enrichment of REE in these alkaline-silicate rocks remain unclear. A giant regolith-hosted REE deposit, found in the Gejiu district on the western edge of the Youjiang
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Iron isotopic compositions of HIMU Ocean island basalts: Implications for the mantle source lithology Lithos (IF 3.5) Pub Date : 2024-02-07 Cheng-Cheng Dai, Xiao-Jun Wang, Li-Hui Chen, Takeshi Hanyu, Xiao-Yu Zhang, Gang Zeng, Lie-Wen Xie
Basalts from the islands of Mangaia, Tubuai, Rurutu (old stage), and Raivavae (Rairua stage) in the South Pacific, and from St. Helena Island in the South Atlantic, are characterized by extremely radiogenic Pb isotopic compositions (e.g., Pb/Pb > 20.5). These ocean island basalts (OIBs) define the famous HIMU (high μ, where μ = U/Pb) component in the mantle ‘zoo’, which has traditionally been thought
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Constraining the timing of lithospheric thinning during continental collision: A perspective of Cenozoic basaltic rocks from the Baltacık-Günkoru (Patnos-Malazgirt) region in the East Anatolia, Turkey Lithos (IF 3.5) Pub Date : 2024-02-06 Vural Oyan
Geochemical and isotopic markers of the most primitive basaltic melts allow us to understand the temporal evolution of the lithospheric mantle and geodynamic processes. This paper presents the geochemical, Sr-Nd-Pb-Hf isotopic data, KAr dating and the petrological evolution of the petrogenesis of the late Miocene-early Pliocene basaltic volcanism observed in the Baltacık-Günkoru region in the northeastern
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Geochronology and geochemistry of the Gréixer rhyolitic caldera complex: Implications on Permo-Carboniferous magmatism (South-Central Pyrenees, NE Spain) Lithos (IF 3.5) Pub Date : 2024-02-05 Joan Martí, Carmen Rodríguez, Gerardo Aguirre-Díaz, Luigi Solari
The Gréixer Rhyolitic Complex is one of the most important manifestations of the post-Variscan Permo-Carboniferous volcanism of the Catalan Pyrenees. This volcanic complex is represented by a > 800 m thick, > 12 km wide, intra-caldera succession, mostly composed of strongly-welded, lava-like rheomorphic rhyolitic pyroclastic rocks. Previous studies have attributed a Lower Permian age to this caldera
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The Corno Alto complex (Adamello batholith): A modern analogue of the high Ba/K sanukitoids Lithos (IF 3.5) Pub Date : 2024-01-30 A. Mosconi, E. Cannaò, F. Farina, M.G. Malusà, S. Zanchetta, M. Tiepolo
The Corno Alto complex represents the onset of the intrusive igneous activity during the Alpine Orogen and for this reason has particular importance in the interpretation of the geodynamic evolution of the Alps. Whole-rock chemistry of the granitoid rocks of the Corno Alto complex reveals peculiar features with respect to the other units of the Adamello batholith, and to typical I-type and S-type granitoids
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Geometry of dissolution trigons on diamonds: Implications for the composition of fluid and kimberlite magma emplacement Lithos (IF 3.5) Pub Date : 2024-02-04 Yana Fedortchouk, Zhuoyuan Li, Ingrid Chinn, Alexandrina Fulop
Volatiles, HO and CO, play an important role in kimberlite magmatism. They facilitate kimberlite production in the mantle by lowering the solidus, drive the fast ascent of kimberlites, fuel their explosive eruptions, and affect preservation of diamonds in kimberlite magma. However, the volatile contents of kimberlite magmas and variations between different kimberlite localities are poorly constrained
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Thermophysical properties of plagioclase amphibolite at high temperatures and pressures and its geophysical implications Lithos (IF 3.5) Pub Date : 2024-02-02 Jiawei Guo, Li Yi, Liang Wei, Duojun Wang
The thermal conductivity () and thermal diffusivity () of plagioclase amphibolite were measured via the transient heat-source method at 298–773 K and 0.5–3.0 GPa, respectively. The experimental results show that the and of the plagioclase amphibolite decrease with increasing temperature but slightly increase with pressure. Combining geothermal parameters with the present results, we calculated the
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Petrogenesis and indicator mineral chemistry of the K-richterite- and leucite-bearing diamondiferous Kareevlei Kaapvaal lamproite Lithos (IF 3.5) Pub Date : 2024-02-02 Zuko Qashani, Sinelethu Hashibi, Geoffrey H. Howarth, Philip E. Janney, Petrus le Roux, Jock Robey
Kareevlei is the first diamond mine to be hosted in a K-richterite- and leucite-bearing Kaapvaal lamproite (formerly termed Group II kimberlite). To constrain the petrogenesis and lithospheric setting of the Kareevlei Kaapvaal lamproites, we present petrography, groundmass mineral compositions, bulk-rock major and trace element concentrations and SrNd isotopes for 13 coherent-textured samples, along
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Late Cretaceous-Eocene exhumation of the northern Lhasa terrane and topographic implications for the Central Tibet Lithos (IF 3.5) Pub Date : 2024-02-02 Gaoyuan Sun, Hugh D. Sinclair, Cristina Persano, Finlay M. Stuart, Xiumian Hu
The central Tibetan Plateau has an average altitude of ~5000 m; its exhumation and chemical weathering greatly influence the global climate and ocean chemistry. The modern central Tibet is characterized by low-relief, high elevation topography with endorheic drainage. When and how these geomorphic characteristics of central Tibet were initiated remains controversial. Here, we have applied zircon UPb
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A Jurassic metamorphic-anatectic event in the Jiaodong Peninsula, eastern China: Zircon and titanite U-Pb ages of migmatites and their implications Lithos (IF 3.5) Pub Date : 2024-02-01 Lishuang Liu, Matthew J. Kohn, Jinghui Guo
Migmatite, generated from anatexis or partial melting, links metamorphism with magmatism and can be used to investigate the source of magmas. Zircon and titanite, as refractory minerals in migmatite, can illuminate both the conditions of partial melting and the sources of associated granites. Mesozoic granitoids in the Jiaodong Peninsula, eastern China, have been studied extensively for their origins
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María Magdalena Island, Mexico: A geochemical, isotopic, and geochronological study of an ocean floor sequence within the shelf of the Gulf of California Lithos (IF 3.5) Pub Date : 2024-02-01 Daniel Villanueva-Lascurain, Peter Schaaf, Teodoro Hernández-Treviño, Gabriela Solís-Pichardo, Bodo Weber, Daniel P. Miggins
María Magdalena Island is part of the Islas Marías Archipelago, located at the mouth of the Gulf of California. The island is composed of a gabbroic and basaltic sill complex that intrudes a sedimentary sequence. Its geology is drastically different to the rest of the archipelago that reflects a protracted geological history with continental affinity. It constitutes a rare example of an exposed ocean
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Talc metasomatism of a magnesite body in response to a granite intrusion: Application of Sm Nd dating of metasomatic dolomite Lithos (IF 3.5) Pub Date : 2024-02-01 Juraj Majzlan, Ivan Dianiška, Stefan Kiefer, Lukáš Ackerman, Veronika Renčiuková
The deposit Gemerská Poloma is located in the Gemeric Superunit of the Western Carpathians and it is currently mined for talc. Talc formed by metasomatic replacement of magnesite, together with dolomite, quartz, pyrite, and accessory minerals. Leachates of dolomite samples in 2.5 M acetic acid yield a SmNd isochron age of 271 ± 7 Ma. This age coincides with the previously published ages of the underlying
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Zircon Hf isotope behavior during the magmatic-hydrothermal processes: A case study from the Yashan pluton, South China Lithos (IF 3.5) Pub Date : 2024-01-26 Yan Wang, Peng Gao, Guo-Chao Sun, Matthew Jason Mayne, Jian Zhang, Changqing Yin, Jiahui Qian
Zircon is a common accessory mineral in granites. Zircon Hf isotope analysis has been widely applied in the studies of crustal evolution and granite genesis. However, previous studies have demonstrated that zircon can be altered by reacting with fluids. At present, it is poorly known how hydrothermal fluids exsolved from evolved magmas may affect the Hf isotope system of zircon. To address this issue
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Recognizing crystal accumulation in plutonic system: Evidence from mafic microgranular enclaves in Early Silurian Qingshan granodiorite, North Qilian Orogenic Belt, NW China Lithos (IF 3.5) Pub Date : 2024-01-24 Maoqiang Yan, Guomeng Li, Wenjie Shi, Jan Marten Huizenga, François Turlin, Chongwen Xu, Robert Moritz, Junhao Wei
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Geochemistry and petrogenesis of gabbroic rocks from the Yap forearc in the western Pacific: Implications for early arc magmatism Lithos (IF 3.5) Pub Date : 2024-01-28 Ling Chen, Limei Tang, Jie Zhang, Xiaohu Li, Wei Wang, Yanhui Dong, Jie Li, Zhenggang Li, Hao Wang, Zhimin Zhu, Xingwei Meng, Wei Yan, Yuan Tian, Zhenggang Wang
Herein, we analyze the elemental composition and Sr–Nd–Pb isotopic data of the gabbroic rocks (gabbros and gabbroic diorites) from the forearc of the Yap trench in the western Pacific to investigate the early arc magmatism. The gabbroic diorites, which exhibit a negative Eu anomaly and relatively flat REE patterns with slight LREE depletion, represent the evolved magma that has undergone varying degrees
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Petrogenesis of the late Cenozoic potassium-rich volcanism in the NW Tibetan Plateau: Constraints on the mantle evolution through post-orogenic events Lithos (IF 3.5) Pub Date : 2024-01-23 Masumeh Sargazi, Chuan-Lin Zhang, Zhi-Hao Song, Hong-Ran Wang, Zahid Hussain, Xian-Tao Ye, Wei Wang, Xiao-Fei Du
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Ages, geochemistry and Sr-Nd-Pb isotopes of alkaline potassic volcanic rocks from the Ahar-Arasbaran region (NW Iran): Evidence for progressive evolution of mantle sources during the Neotethyan subduction system Lithos (IF 3.5) Pub Date : 2024-01-24 C. Natali, M. Aghazadeh, E. Braschi, R. Avanzinelli, Z. Badrzadeh, G. Bianchini, M. Casalini, S. Agostini, M. Mattei, S. Conticelli
The volcanism of the Arasbaran region, northwest Iran, is characterized by multiple magmatic pulses from Cretaceous to Quaternary related to the consumption of the Neotethys oceanic basin and the subsequent continental collision between the Arabia and the Eurasian plates. In this paper we focus on the Eocene igneous products, which show wide compositional variations, ranging from shoshonite to tephrite
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Tholeiitic magmatic record on an extensional passive continental margin: Constraints from Late Paleozoic Woniusi rock associations in the Baoshan block, SE Tibetan Plateau Lithos (IF 3.5) Pub Date : 2024-01-23 Benyan Xu, Dapeng Li, Jifeng Xu, Yang Yu, Jianzhen Geng, Jing Chen, Chao Zhang
The magmatic records on passive continental margins are mostly alkaline-tholeiitic series or bimodal volcanic suites commonly induced by active or passive processes. However, the origin of the relatively rare pure tholeiitic lavas remains poorly understood. In this paper, we document pure tholeiitic records, the Woniusi rock associations, on the passive northern Gondwana margin. During the Late Paleozoic
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Titanite geochemistry traces extreme differentiation of granitic magma in the collisional orogen Lithos (IF 3.5) Pub Date : 2024-01-19 Kun Zhou, He-Zhi Ma, Yi-Xiang Chen, Fang-Yue Wang, Zi-Fu Zhao
The genesis of granitic magma is important for the growth and evolution of continental crust. However, whether and how granitic magma can undergo efficient crystal fractionation from partial melting at the source to magma emplacement in the shallow crust level are still controversial. To address this problem, a combined study of whole-rock and titanite geochemistry was carried out for syn-exhumation
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Fluid metasomatism of subducted continental crust: Insights from Si isotope compositions of metasomatic rocks from the Western and Eastern Alps Lithos (IF 3.5) Pub Date : 2024-01-23 Hui-Min Yu, Zhen Shi, Yi-Xiang Chen, Hans-Peter Schertl, Bao-Liang Wang, Fang Huang
Serpentinite-derived fluids play a crucial role in mass exchange between the Earth's crust and mantle. However, there is currently a limited understanding of how serpentinite-derived fluids influence the Si isotope composition of mantle and subducted crustal materials. Whiteschists in the Dora-Maira Massif of the Western Alps and leucophyllites in Austria of the Eastern Alps were formed through serpentinite-derived
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LA-ICPMS in situ UPb dating of skarn garnet from the Tongling ore district of eastern China Lithos (IF 3.5) Pub Date : 2024-01-17 Ting Liang, Shao-Bing Zhang, Xiao-Yong Yang, Zhen-Xin Li, Xing-Yu Yao, Yu Wang, Sha-Sha Liu
Accurate dating of metallogenesis is important for understanding the origin of mineral deposits including skarn. This study presents LA-ICPMS UPb dating and trace element analysis of garnets from three skarn deposits in the Tongling district, namely Xiaotongguanshan, Guanyinchong, and Baoshantao. All six skarn garnets give UPb ages of 141–146 Ma, which are consistent with the zircon UPb ages of the
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A revision of the Ni-in-garnet geothermometer with special regard to its pressure dependence Lithos (IF 3.5) Pub Date : 2024-01-20 Paolo Nimis, Alberto Zanetti, Leander Franz
We have explored the effect of temperature (T) and pressure (P) on Ni partitioning between garnet and olivine in well-equilibrated mantle xenoliths from on-craton, marginal-craton and off-craton settings and in high-P–T experiments at natural Ni abundance. Contrary to previous evaluations, the xenolith and experimental data indicate that the P effect is not negligible, consistent with the significant
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Ultrahigh-temperature metamorphism of the felsic granulites in the eastern North China Craton and their implications on the Neoarchean tectonic regime Lithos (IF 3.5) Pub Date : 2024-01-19 Minjie Guo, Jian Zhang, Jiahui Qian, Changqing Yin, Peng Gao, Juiyen Hsia, Shuhui Zhang, Chenying Yu
The studies of the meta-pelitic and mafic rocks of the Eastern Hebei in the North China Craton have proved the existence of Neoarchean ultrahigh temperature (UHT) metamorphism. However, whether the metamorphosed felsic rocks of the area experienced the similar UHT metamorphism remains poorly constrained. Based on our new geological mapping and petrological observations, we identified felsic granulites
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Electrical resistivity, seismic velocity, and porosity of crustal rocks from the Oman ophiolite under brine-saturated ocean floor conditions Lithos (IF 3.5) Pub Date : 2024-01-19 Kazumasa Tanimoto, Yuya Akamatsu, Ikuo Katayama
In order to examine the effects of crack properties on electrical resistivity and seismic velocity, we conducted simultaneous measurements of electrical resistivity, seismic velocity and porosity at brine-saturated hydrostatic pressures using mafic crustal rocks from the Oman ophiolite. The resistivity and velocity of the samples increase systematically with increasing confining pressure owing to the
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Multistage and diverse melt-mantle interaction in dunite-harzburgite channel systems beneath oceanic slow-ultraslow spreading centers: Evidence from the Xigaze ophiolite (Tibet) Lithos (IF 3.5) Pub Date : 2024-01-14 Li Wang, Qing Xiong, Jian-Ping Zheng, Hong-Kun Dai, Lian-Rong Tian, Xiang Zhou
High-porosity, melt-focusing channel systems (comprising reactive dunite and its surrounding harzburgite) reflect an essential type of melt extraction within the mantle under mid-ocean ridges, proposed mainly by investigations of ophiolites produced in fast-spreading centers. However, relevant melt-migration processes from mantle wall rocks into dunitic channels under slow-ultraslow spreading centers
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Two episodes of mid-Neoproterozoic mafic magmatism in the Hong'an Terrane, Central China: Records of continental rifting during the breakup of the Rodinia supercontinent Lithos (IF 3.5) Pub Date : 2024-01-18 Yang Xu, Kun-Guang Yang, Ali Polat, Xin Deng
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OIB-type mafic–ultramafic rocks in South Guangxi, South China: A record of interaction between Paleo-Tethys subduction and Emeishan large Igneous Province Lithos (IF 3.5) Pub Date : 2024-01-11 Lisha Hu, Peter A. Cawood, Yuansheng Du, Dicheng Zhu, Zhiqing Lai, Qing Wang, Jie Yang
Late Permian ultramafic–mafic igneous rocks in the Pingxiang area, Guangxi, South China include wehrlite, gabbro, diabase, and amygdaloidal basalt. Geochemical characteristics document interaction between the Emeishan Large Igneous Province (ELIP) and the mantle wedge related to subduction of the Paleo–Tethys. Gabbro and basalt show chondrite–normalized rare earth elements (REEs) and primitive mantle–normalized
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Strontium concentration spikes as evidence for fluid-driven carbonate dissolution during subduction Lithos (IF 3.5) Pub Date : 2024-01-11 Anne A. Haws, Jay J. Ague
Carbonate dissolution, the process by which carbonate minerals are stoichiometrically dissolved by an aqueous fluid, likely plays an important role in liberating carbon from subducting slabs and may thus make significant contributions to global carbon fluxes. It is therefore necessary to understand the fluid infiltration and flow geometries associated with this process. Despite its widespread use as
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Transcrustal magmatic processes of the Tianshuigou dolerite sill from the ca. 1.32 Ga Yanliao large igneous province: Insights from zoned plagioclase macrocrysts Lithos (IF 3.5) Pub Date : 2024-01-11 Ling-Hao Kong, Shuan-Hong Zhang, Hong-Yu Wang, Sen Wang, Yu-Hang Cai, Qi-Qi Zhang, Yue Zhao, Guo-Hui Hu
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Origin of the Permian high silica A-type granites in Halajun, South Tienshan, NW China: Implications for crystal-liquid segregation and rare metal fertilization Lithos (IF 3.5) Pub Date : 2024-01-05 Tian-Chu Chen, Ming-Xing Ling, Yu-Long Liu, Xiao-Yan Jiang, Ying Wei, Jia-Jie Chen
High silica A-type granites (HSAGs) are important carriers of rare metal elements. Formation of HSAGs by crystal-liquid segregation would facilitate fertilization of rare metals and rare earth elements (REE). In this work, we present detailed petrology, whole-rock geochemistry, and in-situ zircon UPb ages and HfO isotopic compositions of the Halajun HSAGs in the South Tienshan Orogenic Belt (STOB)
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Age, clinopyroxene geochemistry and petrogenesis of post-collisional magmatic rocks in the Jonob-e-Sechangi area, Lut block, eastern Iran Lithos (IF 3.5) Pub Date : 2024-01-07 Seyed Ali Mazhari, Kwan-Nang Pang, Urs Klötzli, Huichuan Liu
The Lut-Sistan region, eastern Iran has an extensive record of Eocene-Oligocene magmatism the origin of which is not fully understood. In this study, we analyze a set of volcanic rocks in the Jonob-e-Sechangi area of the Lut block. U-Pb zircon analyses demonstrate that magmatism can be divided into two age groups. Group 1 formed at ∼45 Ma and involved different felsic (calc-alkaline rhyolitic to dacitic)
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Detrital UPb zircon geochronology, zircon LuHf and SrNd isotopic signatures of the Lopingian volcanic-ash-derived Nb-Zr-REY-Ga mineralized horizons from eastern Yunnan, SW China Lithos (IF 3.5) Pub Date : 2024-01-07 Ning Wang, Shifeng Dai, Victor P. Nechaev, David French, Ian T. Graham, Xiaolin Song, Igor Yu. Chekryzhov, Irina A. Tarasenko, Sergey Y. Budnitskiy
The Lopingian altered volcanic-ash horizons in southwest China have attracted significant attention due to highly-elevated concentrations of critical element Nb-Zr-REY-Ga. Despite extensive investigation, the provenance of these distinctive horizons remains controversial. Are they a product of air-born volcaniclastic, erosional source sedimentation, or a complex mixture of multiple sources? This investigation
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Late Cretaceous high Sr/Y rocks and local crustal thickening in the eastern Gangdese batholith, southern Tibet Lithos (IF 3.5) Pub Date : 2024-01-06 Guangxu Li, Lingsen Zeng, Li-E Gao, Lilong Yan
The voluminous Late Cretaceous calc-alkaline magmatic rocks in the Gangdese batholith provide an important record on the mechanisms of the thickening and growth of the continental crust in a continental arc environment. Here, we report data from zircon UPb geochronology and geochemical (whole-rock element and SrNd isotopes and zircon Hf isotope) analyses for the granodiorite and granite from Langxian
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Petrology of the Cretaceous Riacho do Cordeiro dike swarm: Unraveling the giant low-Ti tholeiitic plumbing system of the Equatorial Atlantic Magmatic Province Lithos (IF 3.5) Pub Date : 2024-01-08 Alana R. Dantas, Maria Helena B.M. Hollanda, Antomat A. Macêdo Filho, Alisson L. Oliveira, Carlos J. Archanjo
The formation of the Early Cretaceous Equatorial Atlantic Magmatic Province (EQUAMP), northeastern Brazil, is related to the fragmentation of the West Gondwana supercontinent that culminated in the separation of South America and Africa, during the Lower Cretaceous. The EQUAMP is characterized by its intrusive nature, where mafic dike swarms intrude the Proterozoic basement of the Borborema Province
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Reaction path model of the formation of abiotic immiscible hydrocarbon fluids in subducted carbonated serpentinites, Lanzo Massif (Western Italian Alps) Lithos (IF 3.5) Pub Date : 2024-01-08 Jingyi Huang, Dimitri A. Sverjensky, Isabelle Daniel, Alberto Vitale Brovarone
Fluids generated from subducted slabs participate in the cycling of deep carbon in the crust and upper mantle. In these fluids, aqueous carbon species vary in oxidation state between +IV and -IV depending on whether the fluids are oxidizing or reducing, respectively. Most studies of subduction-zone fluids have focused on oxidized carbon species. However, recent studies of natural samples have demonstrated