Article
Geosciences, Multidisciplinary
Aditya Naik, Naresh Chandra Pant, Jeev Jatan Sharma, Anubha Bhandari, Nilanjana Sorcar
Summary: This study investigates the metamorphism of rocks in the Alwar and Khetri sub-basins of the North Delhi Fold Belt (NDFB) and challenges the previous assumption of westward increasing metamorphic grade in the NDFB. By using petrological tools, the researchers reconstruct the P-T paths of these two sub-basins and propose a schematic P-T-t path for the NDFB. The findings suggest a subduction setting for the orogeny and support the previous hypothesis of the continuance of the Delhi Fold Belt with the Central Indian Tectonic Zone.
GEOLOGICAL JOURNAL
(2022)
Article
Geology
Helga De Wall, Anette Regelous, Bernhard Schulz, Gregor Hahn, Michel Bestmann, Kamal Kant Sharma
Summary: The study of Erinpura Granites in NW India reveals that they can be divided into two types based on their geological characteristics and formation processes. The research suggests that magmatic activity and tectonic movements occurred in the southern sector of the South Delhi Fold Belt, indicating multi-stage geological evolution in the region.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geosciences, Multidisciplinary
Priyanka Mishra, Rajagopal Krishnamurthi, Balbir Singh Bisht, Deepak Kumar Sinha
Summary: The Jahaz prospect in the North Delhi Fold Belt, Rajasthan, is characterized by uranium mineralization closely associated with deformed and metasomatized meta-sediments. Petrographic and electron microprobe studies reveal a complex mineral assemblage and evidence of brittle-ductile deformation. Fluid-induced alterations play a significant role in the formation of mineral assemblages, providing insights into the geological processes responsible for uranium mineralization.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2022)
Article
Geosciences, Multidisciplinary
Rajeev K. Yadav, Stacey S. Martin, Vineet K. Gahalaut
Summary: The Aravalli-Delhi Fold Belt is a prominent ridge on the Indian plate with seismic activity and is potentially related to the relative motion between two cratons in the northern Indian shield. The earthquakes occur on steep faults parallel or oblique to its structural trend, and the entire crust appears to be seismically active. The proximity of large cities to poorly-studied seismic hazard sources in this region calls for further scientific research and policy intervention.
JOURNAL OF EARTH SYSTEM SCIENCE
(2022)
Article
Geochemistry & Geophysics
Danda Nagarjuna, Amit Kumar, G. Pavankumar, C. K. Rao, Ajay Manglik
Summary: The evolution of the Cambay rift basin (CRB) is associated with the separation of Indian and African continents and interaction with the Reunion plume. Analysis of magnetotelluric data reveals a heterogeneous lithosphere in the CRB, with resistive blocks indicating the presence of Archaean lithosphere and conductive anomalies suggesting magmatic underplating associated with the Reunion plume. The sedimentary thickness within the CRB correlates with the contact of Archaean and Proterozoic lithospheres, playing a role in the basin structure and sediment deposition.
Article
Geosciences, Multidisciplinary
Jun-ya Okazaki, Kaushik Das, Anupam Chattopadhyay, Jun-ichi Ando, Arindam Sarkar
Summary: The gneisses from the Sarwar-Junia Fault Zone in India underwent two phases of metamorphism, with pelitic gneiss mainly composed of biotite, sillimanite, garnet, quartz, K-feldspar and plagioclase, and granitic gneiss mainly composed of quartz, plagioclase, K-feldspar and biotite. Geochronology revealed that the pelitic gneiss was deposited on basement granitic gneiss and metamorphism occurred at around 950 Ma. P-T conditions and pseudosection modeling showed that the peak metamorphic condition was at approximately 850 degrees C and 7 kbar pressure, followed by near-isobaric cooling. The presence of pseudotachylyte veins and cataclastic fabric in the gneisses indicated subsequent shallow crustal brittle faulting, possibly occurring between 905 Ma and 750 Ma.
GEOLOGICAL JOURNAL
(2023)
Article
Geosciences, Multidisciplinary
Debojit Talukdar, Ashish Kumar Raul, Madiwalappa Mallappa Korakoppa, Manoranjan Mohanty
Summary: The study reveals the presence of scattered and deformed serpentinite bodies at the western margin of the north Delhi fold belt, Rajasthan, with the chemistry of anhedral spinel aiding in genetic reconstruction and indicating the presence of an ancient forearc environment.
GEOLOGICAL JOURNAL
(2021)
Article
Geology
Debalin Rout, Rajagopal Krishnamurthi, Deepak Kumar Sinha
Summary: The Rohil uranium deposit in Rajasthan, India, is hosted in albitite and associated with Na-metasomatism. The deposit contains uranium minerals such as uraninite, U-silicate, and brannerite, with albitization being pervasive on a regional scale. The alteration of host rocks includes processes like albitization, actinolitization, and carbonatization, with albite-2 being closely related to the main U-REE mineralization stage.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Upama Dutta, Ayan Kumar Sarkar, Sadhana M. Chatterjee, Anirban Manna, Alip Roy, Subhrajyoti Das
Summary: Meta-granites in the South Delhi Fold Belt in northwestern India exhibit remarkable reaction textures formed during metamorphism, with amphibole being sequentially replaced in two stages.
GEOLOGICAL MAGAZINE
(2022)
Article
Geosciences, Multidisciplinary
Suresh Chander
Summary: This study reports the presence of gold-bearing sulfides in a Palaeoproterozoic carbonate-dominated volcanic-sedimentary sequence in the Dugocha area of northwest India. These auriferous sulfides charged with high salinity aqueous phases were deposited in a volcanic environment.
JOURNAL OF EARTH SYSTEM SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Neeraj Kumar Sharma, Tapas Kumar Biswal, Sakthi Saravanan Chinnasamy
Summary: This study investigates the relationship between quartz vein-related sulfide mineralization and paleostress and paleofluid pressure conditions. The South Delhi Terrane in India showcases quartz veins hosted Cu-Pb-Zn mineralization, with stereoplot analysis indicating both high and low paleofluid pressure conditions. Thicker veins are associated with mineralization. Measurements of fluid inclusions in the quartz veins reveal different types and values of pore fluid pressure.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Kunal Kishore Singh, Sunny Kumar Ranjan, Santu Biswas, Bikalpa Chandra Mandal, Joyesh Bagchi
Summary: This study analyzes the subsurface disposition of the northern extremity of the Aravalli Delhi Fold Belt (ADFB) using gravity data and earthquake data. The findings suggest that the deflection of the ADFB may be caused by rotation related to plate collision.
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2022)
Article
Geochemistry & Geophysics
S. Bangaru Babu, A. V. Kulkarni, M. Lakshmana, Dinesh Gupta
Summary: This paper presents the results of regional ground magnetic surveys conducted in Ajmer and Bhilwara districts, Rajasthan, India, to study the geological structures. The surveys revealed a strong magnetic anomaly related to the exposed Archaean basement and the tectonics of the Delhi Fold Belt. The analysis also identified the contacts between different litho units and estimated the depth of the magnetic basement.
JOURNAL OF INDIAN GEOPHYSICAL UNION
(2022)
Article
Geosciences, Multidisciplinary
Ausaf Raza, Shailendra Kumar Gahlot, Prateek Garkhal, Hiten Kumar Jalutharia
Summary: This study presents new geochemical data of the Neoarchaean Jhiri Granite in the North Delhi Fold Belt, along with a discussion on its origin and crustal evolution. The data suggests that the granite belongs to the sanukitoid rock series and has close affinities with 'high-Ti' sanukitoids. The two-stage petrogenetic model proposed explains the formation of the granite through the interaction of melts and fluids derived from subducted oceanic slab and clay-rich terrigeneous sediments with the overlying mantle wedge peridotite.
JOURNAL OF EARTH SYSTEM SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Pavla Stipska, Vit Peresty, Igor Soejono, Karel Schulmann, R. C. Andrew Kylander-Clark, Carmen Aguilar, Stephen Collett, Martin Racek, Jitka Mikova, Otgonbaatar Dorjsuren, Nikol Novotna
Summary: This study investigates the accretionary orogenic processes occurring at the periphery of the Rodinia supercontinent after its assembly. Metamorphic rocks in the Mongolia collage of the Central Asian Orogenic Belt are studied to fill the knowledge gap. It is found that the tectono-metamorphic evolution was mainly characterized by the late Proterozoic-early Cambrian cycle, but a Tonian age metamorphism is documented in the northern part of the Precambrian Baidrag block.
GEOSCIENCE FRONTIERS
(2023)
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)