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Zircon in tin granite as tracer for fluid metasomatism and Sn mineralization Lithos (IF 3.5) Pub Date : 2024-04-06 Zhen-Peng Duan, Hui-Min Su, Shao-Yong Jiang
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Syn- and post-collisional mafic igneous rocks from the East Kunlun Orogenic Belt: Implications for recycling of subducting continental crust during the Silurian-Devonian Lithos (IF 3.5) Pub Date : 2024-04-04 Li-Tao Ma, Guo-Chao Sun, Li-Qun Dai, Zi-Fu Zhao, Ye-Dan Hu, Qing-Cheng Yang, Lei Qin, Bing Gong
Syn- to post-collisional mafic igneous rocks are widely distributed along continental collision orogenic belts and can be used to constrain the nature of the orogenic mantle and relevant chemical geodynamic processes during orogenesis. However, there is uncertainty about the mechanisms of recycling of continental crustal materials in continental subduction channels. We report chronological and geochemical
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Silicate melt immiscibility as the cause of large-scale rare-metal mineralization in a peralkaline granite system: The case of the Baerzhe deposit in NE China Lithos (IF 3.5) Pub Date : 2024-04-04 Hui-Min Su, Shao-Yong Jiang, Tao Jin, Yu-Ying Che, Xin-You Zhu
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Hf-Nd isotope decoupling in S-type granitoids caused by disequilibrium melting of metasedimentary rocks: Evidence from the North Qinling Terrane, Central China Lithos (IF 3.5) Pub Date : 2024-04-02 Fang-Yuan Sun, Shao-Bing Zhang, Yong-Fei Zheng, Zhen-Xin Li, Ting Liang
The intrinsic assumption of radiogenic isotope tracing is that isotope systems maintain equilibrium between melt and source. However, this assumption is not naturally correct, particularly for S-type granites, which are formed by partial melting of metasedimentary rocks. The S-type metagranites from the North Qinling Terrane show various degrees of HfNd isotope decoupling and discrepancies between
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Stratigraphy, geochronology, geochemistry and Nd isotopes of the Ouarzazate Group, Anti-Atlas, Morocco: Evidence of a Late Neoproterozoic LIP in the northwestern part of the West African Craton Lithos (IF 3.5) Pub Date : 2024-03-29 Mehdi Ousbih, Moha Ikenne, Brian Cousens, Cyril Chelle-Michou, Hafida El Bilali, Abdelaziz Gaouzi, Sava Markovic, Fatiha Askkour, Mohamed Mouhajir, Salim El Mouden, Nasrrddine Youbi, Richard Ernst
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Are the Fe-rich-clay veins in the igneous rock of the Kansas (USA) Precambrian crust of magmatic origin? Lithos (IF 3.5) Pub Date : 2024-03-26 Valentine Combaudon, Olivier Sissmann, Sylvain Bernard, Jean-Christophe Viennet, Valentine Megevand, Corentin Le Guillou, Julia Guélard, Isabelle Martinez, François Guyot, Hannelore Derluyn, Eric Deville
The North American Mid-Continent rift (MCR) is a 1.1 Ga aborted rift, which has recently become an area of intense focus for energy resource exploration following the report of H emissions. To document the nature of the producing rocks, we conducted a multi-scale study on preserved drill-core samples from the DR1-A well located in the same area as the H-producing wells in Kansas. We showed that this
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Disequilibrium melting of recycled phosphate-rich crust in Yunkai Massif, South China Lithos (IF 3.5) Pub Date : 2024-03-26 Zhiwang Ma, Feng Guo, Liang Zhao, Xin Huang, Yaqian Wen, Feng Zhang
We conduct a comprehensive study including bulk-rock and mineral geochemical analyses, Rhyolite-MELTS and phase equilibrium modeling on Caledonian (422–436 Ma) granitic plutons from the Yangchun region of Yunkai Massif, South China, aiming to estimate the melting P-T-HO conditions and decipher the mechanism for crustal anatexis. These rocks are typical S-type granites with presence of muscovite and
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Evolution of A-type granites during the Late Paleoproterozoic orogenic cycle of North China craton: Implications for post-collisional magmatism Lithos (IF 3.5) Pub Date : 2024-03-26 Dongjian Ouyang, Shujuan Jiao, William J. Collins, Yang Qi, Hao Liu, Jinghui Guo
“A-type” granites were originally considered anorogenic, however current consensus closely associates them with orogenic settings. The correlation between the prolific emergence of A-type granites and the assembly of the Columbia (Nuna) supercontinent during the Late Paleoproterozoic remains ambiguous possibly being indicative of a geodynamic shift from the amalgamation to the fragmentation of the
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Carboniferous–Early Permian volcano-sedimentary units from the northern margin of the North China Craton recorded subduction initiation in the Paleo-Asian Ocean Lithos (IF 3.5) Pub Date : 2024-03-22 Qingxiang Du, Jinrui Han, Sainan Wu, Guangsu Li, Zuozhen Han, Dawei Lv, Xiaoli Shen
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Multiple-pulse magmatic intrusion and fluid metasomatism in Mesozoic Qianlishan rare metal granite, South China: Records from apatite geochemistry Lithos (IF 3.5) Pub Date : 2024-03-19 Feng Zhang, Feng Guo, Xiaobing Zhang, Liang Zhao, Weicheng Hua, Xin Huang, Xufeng Tian
South China block contains abundant rare metal resources that have widely been considered to be associated with highly evolved granitic magmatism and related fluid metasomatism. Here we perform detailed geochemical analyses on apatite and bulk rock from the ore-bearing granites (equigranular zinnwaldite granite) and ore-barren granites (porphyritic biotite granite and granitic dyke) at Qianlishan pluton
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Garnet coalescence clogs melt extraction channels in migmatite Lithos (IF 3.5) Pub Date : 2024-03-19 Vincenzo Festa, Richard Spiess, Fabrizio Tursi
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Characteristics and formation of rare-metal pegmatites and granites in the Duanfengshan-Guanyuan district of the northern Mufushan granite complex in South China Lithos (IF 3.5) Pub Date : 2024-03-18 Lu Zhang, Shao-Yong Jiang, Rolf L. Romer, Hao-Xiang Zhang, Song-Lin Wan
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Magmatic cyclicity and episodic continental growth of the Australian Tasmanides Lithos (IF 3.5) Pub Date : 2024-03-16 Qing Zhang, Ross N. Mitchell, Solomon Buckman, Uwe Kirscher, Xian-Hua Li
The hafnium isotopes of zircon have recently been identified as a new means of detecting magmatic cyclicity. A hierarchy of possible magmatic cycles has been verified, ranging from the ∼600 Myr supercontinent cycle to 10–20 Myr plutonic cycles. While the supercontinent cycle is well-established, the shorter mantle convective and plutonic cycles require further work to understand how magmatic dynamics
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Olivine in ultramafic rocks from the Polaris Alaskan-type intrusion: A geochemical record of open-system crystallization, diffusional re-equilibration, mantle source, and redox conditions in primitive arc magmas Lithos (IF 3.5) Pub Date : 2024-03-15 Dylan W. Spence, James S. Scoates, Dejan Milidragovic, James A. Nott, Graham T. Nixon
Olivine in cumulates from the Early Jurassic Polaris Alaskan-type ultramafic-mafic intrusion in the North American Cordillera displays a wide range of textures and compositions produced in a dynamic crystallization environment as part of a transcrustal arc magmatic system. Major, minor, and trace element analyses of olivine were determined using combined electron probe microanalysis (EPMA) and laser
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Final suture of the Palaeo-Asian Ocean domain: Insights from the geochemistry and geochronology of the early to Middle Permian Elitu Formation volcanics Lithos (IF 3.5) Pub Date : 2024-03-15 Jianzhou Tang, Shaohua Zhang, Zhicheng Zhang, Jinzhuang Xue, Cong Ding
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Mineralogical and petrological constraints and tectonic implications of a new coesite-bearing unit from the Alpine Tethys oceanic slab (Susa Valley, Western Alps) Lithos (IF 3.5) Pub Date : 2024-03-15 Stefano Ghignone, Mattia Gilio, Alessia Borghini, Federica Boero, Marco Bruno, Emanuele Scaramuzzo
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Remobilization of carbon in the lithospheric mantle during decratonization Lithos (IF 3.5) Pub Date : 2024-03-15 Ya-Dong Wu, Jin-Hui Yang, Vadim S. Kamenetsky, Hao Wang, Xiao-Guang Li
The sub-continental lithosphere mantle (SCLM) contains considerable amounts of carbon and is responsible for significant CO emissions via magmatism during major heating and rifting events. However, the role of SCLM in Earth's carbon cycle during other geological processes, such as decratonization, a process of major removal and replacement of cratonic SCLM, remains poorly understood. The North China
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The Muskox intrusion: Overview of a major open-system layered intrusion and its role as a sub-volcanic magma reservoir in the Mackenzie large igneous province Lithos (IF 3.5) Pub Date : 2024-03-13 James S. Scoates, R.F. Jon Scoates
The Muskox intrusion in Nunavut, Canada, is one of the archetype mafic layered intrusions globally. It represents a sub-volcanic magma reservoir to flood basalts of the 1.27 Ga Mackenzie large igneous province (LIP), which also includes the coeval Coppermine River flood basalts and Mackenzie dike swarm. Discovered in 1956, the Muskox intrusion was the target of a scientific drilling program in 1963
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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
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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
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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
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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
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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 : 2024-02-10 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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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 : 2024-02-07 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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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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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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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[sbnd]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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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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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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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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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