Article
Geochemistry & Geophysics
William J. Shinevar, Oliver Jagoutz, Jill A. VanTongeren
Summary: The detailed petrographic study of the Gore Mountain Garnet Amphibolite in the Adirondack Highlands, NY, reveals that these rocks formed at ultrahigh-temperature conditions, significantly hotter than previously estimated. This reaction is dated to around 1053.9 Ma, and the peak metamorphic P-T conditions were determined through thermobarometry, diffusion modelling, and thermodynamic modelling.
JOURNAL OF PETROLOGY
(2021)
Article
Geology
Chenghan Xu, Fengyue Sun, Xingzhu Fan, Lu Yu, Depeng Yang, Shahzad Bakht, Dongqian Wu
Summary: The North Qaidam Orogenic Belt is characterized by Paleozoic magmatism and high-pressure metamorphism. The study of granitoids in the Tanjianshan area provides important information about the tectonic evolution and growth of the continental crust. The results show regional differences in magmatism and suggest significant crustal reworking and geodynamic mechanisms in the northern part of the belt.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geology
Jianzhou Tang, Jian Cheng, Zhicheng Zhang, Jinzhuang Xue, Bo Liu, Tiejun Duan, Weijia Zhan, Cong Ding, Qi Wang, Huaihui Zhang, Yunxi Meng
Summary: Through various analytical methods, this study reveals the Late Permian-Carboniferous felsic magmatic rocks in central Inner Mongolia, China, and sheds light on their origin and spatiotemporal distribution. These rocks may originate from the partial melting of juvenile crustal components with subordinate input of mantle-derived melts.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Ya-Dong Wu, Jin-Hui Yang, Hao Wang, Yu-Sheng Zhu, Lei Xu, Bao-Quan Zhou, Rui Li
Summary: The Mesozoic basalts and andesites from the Siziwangqi area in northwestern China show evidence of a mantle-derived origin for the Ol-basalts, and a more differentiated, crust-derived origin for the Pl-basalts and andesites. The geochemical features suggest a mixing and fractionation process, with crustal melting induced by underplating of mafic magmas. The enriched isotopic compositions indicate recent lithosphere enrichment from subduction components, related to intracontinental extension of the North China Craton.
Article
Geosciences, Multidisciplinary
Yufeng Ren, Xuexiang Qi, Cheng Wei, Xufeng Liu, Fengbao Ji
Summary: This paper presents the geological and geochemical data of ophiolitic blocks in the southeast margin of the Gaoligong tectonic belt and discusses their significance in the tectonic evolution of the Meso-Tethys. The ophiolites contain mainly harzburgite peridotites, exhibiting distinct mineral chemistries and occurrences. These peridotites have experienced different geological processes and represent fragments of subcontinental lithospheric mantles.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Yao-Liang Ma, Yun Zhong, Harald Furnes, Qiangba Zhaxi, Jie-Hui Pang, Wei-Liang Liu, Bin Xia
Summary: The Shiquanhe boninite dikes, located in the Meso-Tethyan Bangong-Nujiang suture zone in Tibet, are characterized by high MgO and enrichment in light rare earth elements, indicating their origin from a depleted mantle source replenished by subducted sediments. These newly discovered boninite dikes provide crucial evidence of island arc affinity for the Shiquanhe ophiolite, showcasing their rarity in orogenic belts on Earth.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Pavel Kotler, Sergey Khromykh, Nikolay Kruk, Min Sun, Pengfei Li, Valentin Khubanov, Dina Semenova, Alexander Vladimirov
Summary: The Kalba batholith in Eastern Kazakhstan is composed of granodiorite-granite and leucogranite rocks, formed in two different magmatic events. The granodiorite-granite rocks were produced by large-scale crustal melting, while the leucogranites originated from low-degree partial melting of deep sediments. The formation of the batholith spanned about 21 million years, with granodiorites and granites forming between 297-286 Ma and leucogranites between 288-276 Ma.
Article
Geology
Xia Lei, Yan QuanRen, Xiang ZhongJin, Zheng HongBo, Niu Rui
Summary: The tuffite samples from the Hekou Formation in Napo basin display the geochemical characteristics of island-arc volcanic rock, which are inferred to be derived from the Middle-Late Triassic acidic volcanic rocks in Pingxiang area, Southwest Guangxi. The collision between the South China block and North Vietnam terrane should occur in the middle to late stage of Late Triassic.
ACTA PETROLOGICA SINICA
(2022)
Article
Geology
Chenwei Li, Min Zeng, Zhijun Li, Si Chen
Summary: The high-Mg diorites in the Shiquanhe-Num Co ophiolitic melange belt formed in the Late Jurassic period with geochemical characteristics similar to sanukites of the Setouchi volcanic rock belt in southwest Japan. These diorites were likely derived from partial melting of mantle peridotite due to interaction with hydrous melts of subducted sediments during the early evolution of the northward subduction of the Bangong-Nujiang Tethys ocean beneath the Qiangtang terrane.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geology
Tanzil Deshmukh, N. Prabhakar, A. Bhattacharya
Summary: By investigating garnet-staurolite schists and associated lithologies from the central Mahakoshal Belt, a clockwise pressure-temperature-time path was reconstructed to understand the protracted accretionary evolution along the Central Indian Tectonic Zone. The study revealed a mosaic of domains in the CITZ that were accreted together in the Neoproterozoic time, showing evidence of different tectonothermal events at 1.80-1.55 and 0.95-0.85 Ga.
JOURNAL OF GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Alexandra V. Stepanova, Pavel Azimov, Alexander V. Samsonov, Svetlana V. Egorova, Irina I. Babarina, Alexander N. Larionov, Yulia O. Larionova, Anna V. Kervinen, Vladimir S. Stepanov
Summary: This study of the Pechnoy mafic layered sill in the Belomorian province provides new insights into the characteristics of mafic rocks enriched in chlorine elements and originating approximately 2.2 billion years ago, with preserved primary magmatic features. The rocks show signs of in situ fractional crystallization and a common mantle source for ca. 2.2 Ga igneous rocks in the Fennoscandian Shield.
Article
Geosciences, Multidisciplinary
Qiuding Du, Zhipeng Qin, Gangyang Zhang, Jian Wang, Gang Zhou, Yuan He
Summary: Zircon U-Pb ages, geochemical data, and Sr-Nd-Hf isotopic data were analyzed to study the source, petrogenesis, and tectonic setting of the Paleocene Qulong high-Mg dioritic plutons in southern Tibet. The results indicate that these plutons are metaluminous calc-alkaline rocks with sanukitic HMD affinity. They show enrichment in ion lithophile and light rare earth elements, depletion in Nb-Ta, and low (Th/Nb)N ratios, similar to oceanic island basalts. The isotopic data suggest that the Qulong HMDPs originated from a subduction-related lithospheric mantle modified by the asthenosphere and mixed with sediment melt, triggered by the slab roll-back of the subducting NeoTethys slab of the India-Asia collision at ca. 64 Ma.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Colin D. Card, Kathryn M. Bethune, Nicole Rayner, Kenneth E. Ashton
Summary: The northwest-dipping Virgin River shear zone is part of the Snowbird tectonic zone, separating Paleoproterozoic rocks from Archean rocks. The oldest displacement in the shear zone was reverse oblique, with granite plutons deforming the structure. The age of the shear zone is younger than the gneissic fabrics contained within Paleoproterozoic plutonic rocks, indicating a collisional Snowbird orogeny around 1.90 Ga.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Zhongcui Pan, Fengyue Sun, Zhichao Cong, Nan Tian, Wei Xin, Li Wang, Yajing Zhang, Dongqian Wu
Summary: The East Kunlun Orogenic Belt in western China provides valuable geological information for the tectonic evolution of the Paleo-Tethys Ocean. This study focuses on the granitoids in the Ela Mountain area and identifies their types and ages through zircon U-Pb dating. The results indicate that the magmatic activities in the area can be categorized into three peak periods, each corresponding to a specific tectonic setting.
Article
Geochemistry & Geophysics
Shuang Gao, Wei-Feng Chen, Hong-Fei Ling, Li-Qiang Sun, Quan Ren, Guo-Ai Xie, Kai-Xing Wang, Rong-Song Tian
Summary: In this study, an A-type granite (Yingongshan granite) dated at 150 Ma was discovered in the Late Jurassic period in the western part of the northern margin of the North China Craton. The geochemical characteristics suggest that the Yingongshan granite originated from partial melting of preexisting calc-alkaline granitoids in the crust under the influence of magma intrusion from the enriched lithospheric mantle. This discovery indicates local extension occurred as early as 150 Ma in the western North China Craton.