Article
Geochemistry & Geophysics
Suranjan Ghosh, N. Prabhakar, Joseph D'Souza
Summary: The study explores the formation processes and metamorphic conditions of multilayer corona textures in the Late Proterozoic mafic granulites of the Sandmata Complex in Rajasthan, northwestern India. It reveals the interplay between steady state and sequential diffusion-controlled mineral growth mechanisms, with diffusion of Mg, Fe, and Ca identified as the main driving force behind the growth of corona textures. The research reconstructs a near-isobaric cooling P-T path and supports the magmatic underplating hypothesis in the Sandmata Complex for the development of granulite facies assemblage.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Martin Robyr
Summary: Most data suggest that the Himalaya is formed by the collision of India and Asia, but recent discoveries of pre-existing geological events challenge this idea. This study presents new evidence of pre-Himalayan metamorphism in a specific region of the Himalayas, providing further support for the existence of a pre-Himalayan orogenic cycle.
SWISS JOURNAL OF GEOSCIENCES
(2023)
Article
Geochemistry & Geophysics
Sampriti Basak, Eric Hasenstab, Santanu Kumar Bhowmik, Axel Gerdes, Somnath Dasgupta, Carsten Muenker, Gr. Ravindra Kumar, Sumit Chakraborty
Summary: Studying high-grade metamorphic rocks in a crustal-scale shear zone can provide insights into the Archean tectonic processes. Petrological investigations reveal different compositions and reaction histories of these rocks. By using thermobarometry, phase equilibria modeling, and geochronology, a multi-stage P-T-t history was reconstructed, suggesting an early form of peel-back styled orogenesis and intracrustal differentiation.
JOURNAL OF PETROLOGY
(2023)
Article
Geology
Yi-Peng Li, Lin Ding, Alexander C. Robinson, De-Liang Liu, Jing Xie, Li-Yun Zhang, Chen-Yuan Zhao, Ya-Hui Yue, Yiduo Liu, Ilhomjon Oimuhammadzoda, Mustafo Gadoev, Negmat Rajabov
Summary: One of the key geological features in the Pamir region is a south-dipping lithospheric slab with an intracontinental Wadati-Benioff zone. Previous studies proposed that the slab represents subducted Asian continental lithosphere, while recent research suggests it is delaminated from the Pamir. To investigate these hypotheses, crustal xenoliths sourced from the deep lithosphere in the eastern Pamir were analyzed. The results show that the xenoliths represent the mid-lower crustal rocks of the Pamir magmatic arc and the lower crustal rocks of Pamir terranes, supporting the delamination hypothesis and the minimal northward translation of the Pamir.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Shashank Prabha Mohan, Ian S. Williams, Sandeep Singh
Summary: The translation mentions that the high-grade Higher Himalayan Crystallines (HHC) have undergone four significant phases of deformation and metamorphism, with the earliest dating back to the Ordovician. It also discusses the age determination results of minerals such as zircon and monazite.
GEOLOGICAL JOURNAL
(2022)
Article
Geochemistry & Geophysics
Satyajeet S. Thakur, Suresh C. Patel, Chandni Chaurasia, Nainika Gour
Summary: Pseudosection modelling provides new insights into pre-Himalayan metamorphism and constrained the hydration P-T conditions in metamorphosed mafic xenoliths from the Kinnaur Kailash Granite, Northwest Himalaya.
JOURNAL OF PETROLOGY
(2022)
Article
Geology
Shashi Tamang, Chiara Groppo, Frederic Girault, Franco Rolfo
Summary: Recent studies have shown that kinetic factors can affect the nucleation of garnet, causing a delay in its appearance compared to equilibrium predictions. This study focuses on the garnet nucleation and growth in aluminous metapelites from the Barrovian inverted metamorphic pile in central Nepal. The results suggest that the bulk-rock composition may influence the degree of garnet nucleation overstepping, and the implications of this overstepping on the P-T evolution of the metamorphic sequence were explored.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Lin-Sen Li, Xiao-Lei Wang, Chris Yakymchuk, Simon Schorn, Jin-Hai Yu, Di Wang, Jun-Yong Li, De-Hong Du, Yu Huang
Summary: The Paleoproterozoic era is a critical period for understanding global geodynamic regimes and plate tectonic processes. However, detailed studies on pressure-temperature-time paths of Paleoproterozoic metamorphic rocks are limited. In this study, zircon U-Pb geochronology was used to identify a prolonged Paleoproterozoic metamorphism in the Kongling Complex of the northern Yangtze Block. The results contradict previous hypotheses and suggest a typical warm subduction/collision in the Paleoproterozoic plate tectonic regime.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Joshua M. Rosera, Ryan E. Frazer, Ryan D. Mills, Kristin Jacob, Sean P. Gaynor, Drew S. Coleman, G. Lang Farmer
Summary: This study investigates the origin and formation of fluorine-rich rocks in the southern Rocky Mountains. The results suggest that these rocks may have originated from the mafic lower crust and that the breakdown of amphibole in high-temperature metamorphic rocks was a key process in their formation. These findings have important implications for understanding the genesis of porphyry Mo mineralization.
AMERICAN MINERALOGIST
(2023)
Article
Geology
Francesco Nosenzo, Paola Manzotti, Marc Poujol, Michel Ballevre, Jessica Langlade
Summary: This study investigates the Palaeozoic history of the northern Dora-Maira Massif involved in Alpine continental subduction. The results show the presence of a low strain domain in the region where the pre-Alpine amphibolite-facies foliation has been preserved. Thermodynamic modeling based on garnet isopleths constrains the pre-Alpine pressure-temperature (P-T) evolution, while the analysis of garnet and metamorphic zircon provides insights into the peak Barrovian metamorphic conditions and early exhumation or cooling processes.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Gozde Altuntas, Bulent Bostan
Summary: In this study, the effects of pre-deformation on the retrogression and re-aging (RRA) and 17500 h natural aging (NA) heat treatment were investigated. Multiple analysis methods were used to study the distribution and geometric changes of phases, elemental ratios in precipitates, calculation of crystallographic parameters, and changes in phase transformation temperatures. The results showed that pre-deformation had an impact on the hardness, dislocation density, and lattice strain of the material.
KOVOVE MATERIALY-METALLIC MATERIALS
(2022)
Article
Geosciences, Multidisciplinary
V. M. Grigorieva, A. L. Perchuk, V. S. Shatsky, N. G. Zinovieva
Summary: This study reconstructs the retrograde metamorphic P-T paths of mafic granulites from the Yubileinaya and Novinka kimberlite pipes using mineral geothermobarometry. The results show the subisobaric transition of the rocks from low-grade granulite facies to low-grade amphibolite facies at the middle crust depth. The compositions of garnet, clinopyroxene, and orthopyroxene are found to depend on the adjacent mineral. The thermodynamic conditions of the low-grade amphibolite facies are determined using phase equilibria modeling.
DOKLADY EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
S. S. Thakur, S. C. Patel, A. K. Singh
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2015)
Article
Geochemistry & Geophysics
Azhar M. Shaikh, Satya P. Kumar, Suresh C. Patel, Satyajeet S. Thakur, Subramanian Ravi, Duryadhan Behera
MINERALOGY AND PETROLOGY
(2018)
Article
Geosciences, Multidisciplinary
S. C. Patel, S. Ravi, Y. Anilkumar, A. Naik, S. S. Thakur, J. K. Pati, S. S. Nayak
JOURNAL OF ASIAN EARTH SCIENCES
(2009)
Article
Geosciences, Multidisciplinary
P. Nandini, S. S. Thakur
JOURNAL OF ASIAN EARTH SCIENCES
(2011)
Article
Geosciences, Multidisciplinary
S. S. Thakur, S. C. Patel
JOURNAL OF ASIAN EARTH SCIENCES
(2012)
Article
Geochemistry & Geophysics
S. S. Thakur, K. Madhavan, S. C. Patel, D. Rameshwar Rao, A. K. Singh, S. Pandey, P. Nandini
Article
Geosciences, Multidisciplinary
C. Chaurasia, K. Madhavan, S. S. Thakur, S. C. Patel, A. K. Samal, S. Nema, P. K. Dixit
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2020)
Article
Geochemistry & Geophysics
Satyajeet S. Thakur, Suresh C. Patel, Chandni Chaurasia, Nainika Gour
Summary: Pseudosection modelling provides new insights into pre-Himalayan metamorphism and constrained the hydration P-T conditions in metamorphosed mafic xenoliths from the Kinnaur Kailash Granite, Northwest Himalaya.
JOURNAL OF PETROLOGY
(2022)
Article
Geochemistry & Geophysics
S. C. Patel, S. Ravi, S. S. Thakur, T. K. Rao, K. V. Subbarao
MINERALOGY AND PETROLOGY
(2006)
Review
Geosciences, Multidisciplinary
Fuquan Yang, Xinxia Geng, Zhixin Zhang, Guoren Liu, Hanqing Zhang
Summary: Northern Xinjiang in China is an important part of the Central Asian Orogenic Belt, characterized by multiple episodes and types of mineralization. Cu and Au deposits are mostly found in Altay, Junggar, and Tianshan, with minor occurrences in Beishan. The most common types of Cu-Au deposits are volcanogenic and porphyry deposits. The formation of Cu-Au deposits can be divided into five mineralization episodes, with the Devonian and Carboniferous being the main periods. These deposits developed in various tectonic settings, including island arc, continental arc, collision, and postcollisional extensional tectonics.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Jiang Zhu, Dan-yang Liu, Chao Chen, Song Chen, Yuan-bing Zou, Leonid Danyushevsky, Jing-meng Huang, Xiang-wei Tang
Summary: Numerous lode gold and silver deposits have been discovered in orogenic belts in China. This study focuses on the formation and fluid evolutions of the super-large Yingdongpo gold and giant Poshan silver deposits in the Tongbai-Dabie orogen. The results suggest that both deposits were formed concurrently with Early Cretaceous granitic magmatism and the ore-forming fluids were primarily of magmatic origin with meteoric water inputting. The gold mineralization is related to a change in the physicochemical properties of the fluids, while the silver mineralization is favored by progressive deposition of sulfides in a slowly cooling hydrothermal system.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Arun Bhadran, B. P. Duarah, Drishya Girishbai, Mohammad Atif Raza, Avi Mero, Sandeep Lahon, A. L. Achu, Girish Gopinath
Summary: The Brahmaputra foreland basin, known for its dynamic tectonism and sediment load, exhibits a variety of seismically generated soft sediment deformation structures (SSDS) such as clastic dikes, sand sills, and micro-faults. These structures, influenced by multiple strong seismic events, are characterized by their dimensions, intrusion angles, cross-cutting relations, wall shattering, and age. The study suggests that a significant earthquake with high intensity and magnitude might have caused liquefaction features in the area. The findings highlight the importance of studying SSDS in tectonically active regions with limited surface ruptures and dense alluvial cover.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Huan Wang, Lirong Dou, Xingyang Zhang, Jiquan Yin, Beiwei Luo, Haigang Duan, Peiguang Yang, Yifan Song
Summary: Quantitative analysis of sediment composition and microfacies helped identify changes in facies belts in the Cretaceous Mishrif Formation. The study demonstrated the importance of carbonate microfacies quantification and its implications for paleogeographic research.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Boran Wang, Zhilong Huang, Dongsheng Xiao, Haiyue Yu, Wenren Zeng, Xin Wang, Tong Qu, Zhiyuan Li, Yizhuo Yang
Summary: By systematically analyzing the source rocks of the Sangonghe Formation in the Taibei Sag, NW China, and using kerogen kinetics modeling, this study reveals the influence of geological conditions on hydrocarbon generation and expulsion. The source rocks in different environments show distinct geochemical characteristics and hydrocarbon generation potential.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Haiying Yang, Zhifang Zhao, Haifeng Fan, Min Zeng, Jiafei Xiao, Xiqiang Liu, Shengwei Wu, Jiangqin Chao, Yong Xia
Summary: This paper investigates the REE enrichment and the role of Fe/Mn (oxyhydr)oxides in marine phosphorites from the early Cambrian period in South China. The study reveals that Fe/Mn (oxyhydr)oxides play a crucial role in REE enrichment and are controlled by Fe-redox pumping.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Qing Li, Hongbin Wang, Feng Cai, Di Luo, Fanxing Kong, Ang Li, Xiting Liu
Summary: The elemental and isotopic compositions and abundance of carbonates in marine sediments are used to reconstruct ancient climate and ocean conditions. This study analyzed sediment samples from the Okinawa Trough to examine the relationship between carbonates' compositions and methane seepage and sea-level changes. The results indicate that both biogenic and authigenic carbonates are important factors in understanding paleoclimate and paleoceanography.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Maryam Akbarzadeh Aghdam, Abdolreza Ghods, Farhad Sobouti, Khalil Motaghi, Keith Priestley, Mohammad Enayat
Summary: The Makran subduction zone is difficult to monitor due to limited seismic activity, but a temporary seismic network was installed to investigate the relationship between different regions and detect seismicity. The observed seismicity suggests the presence of structural boundaries and seismically inactive areas.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Zhen-Yu Wang, Hong-Rui Fan, Hai-Dong She, Kui-Feng Yang
Summary: This study conducted detailed geochemical, geochronological and isotopic analyses on the Songxian syenite in the Qinling Orogen. The results revealed the magma sources, petrogenesis and geodynamic implications of this alkaline intrusion. The study suggests that the syenite was formed through multiple stages of magmatism, involving the partial melting of the enriched lithospheric mantle and mixing with melts derived from the lower crust.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Yu Li, Wen-Liang Xu, Xiao-Ming Zhang, Jie Tang
Summary: This study presents new zircon U-Pb-Hf and whole-rock geochemical data for Jurassic intrusive rocks in the Yanbian area of NE China, providing insights into the subduction history of the Paleo-Pacific Plate. The study reveals three stages of Jurassic magmatism in the area, indicating the presence of an active continental margin related to the initial subduction of the Paleo-Pacific Plate beneath the Eurasian continent.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Lina Ai, Shengfa Liu, Shuai Cong, Hui Zhang, Peng Cao, Kaikai Wu, Wenxing Ye, Che Abd Rahim Mohamed, Xuefa Shi
Summary: This study investigates the depositional configurations and sedimentary environments of the Malacca Strait through analyzing grain size characteristics and hydrographic data. The results show that residual sediments are concentrated in the central region, while modern terrigenous sediments are distributed along the coast of Malaysia and the northern region. The sedimentary environments are influenced by seasonal variations and hydrodynamic conditions.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Liang Xiao, Jia-qi Liang, Li-yan Guo, De-shuang Ji, Man Yuan, Xiang-chuan Li, Nan Sun, Zuo-chen Li
Summary: This study investigates the correlation between stable carbon isotopes of plant fossils and CO2 levels in the Jurassic period. The results suggest a weak correlation between the two, indicating caution is needed when using stable carbon isotopes to reconstruct high paleo-CO2 concentrations.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xuli Yang, Feng Huang, Jifeng Xu, Xijun Liu, Liying Zhang, Zhao Zhang, Benyan Xu, Man Zhang, Yunchuan Zeng, Qian Liu, Mingda Lv
Summary: The extensively developed Early Cretaceous intermediate-felsic rocks in the northern North China Craton provide valuable insights into the nature of Paleo-Pacific subduction and associated geodynamic processes. Geochemical and geochronological analyses of trachyandesites and rhyolites from the eastern Hebei, northern NCC suggest that the trachyandesites likely originated from enriched mafic lower crust and the rhyolites are derived from the trachyandesitic magmas through fractional crystallization. The migration direction change of these rocks is believed to be primarily attributed to slab rollback of the subducting Paleo-Pacific Plate.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Wei Liu, Ping Gao, Xianming Xiao, Yanming Zhao, Yijie Xing, Jinku Li
Summary: The organic-rich shales of the Shuijingtuo Formation in China are an important target for shale gas exploration. The upper section of the formation, primarily consisting of limestone, silty shale, and black shale, has been rarely studied but recently showed promising results for shale gas exploration. Geochemical investigations of the upper section shale deposits revealed that the organic matter enrichment mechanism underwent dynamic changes due to relative sea-level changes and episodic upwelling activities.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Xin Wang, Chen Zhang, Zixin Xue, Qianyou Wang, Zhenxue Jiang, Kun Zhang, Xiangye Kong
Summary: This study analyzed the heterogeneity of gas compositions and the effects of magmatism on gas accumulation in shale gas exploration in the Yangtze plate. The results showed that magmatism caused the development of micro-fractures in shale reservoirs and accelerated the thermal evolution rate of organic matter. The impact of magmatism on shale gas accumulation varied in different regions, either favoring or compromising efficient gas accumulation in shale reservoirs.
JOURNAL OF ASIAN EARTH SCIENCES
(2024)