Article
Geosciences, Multidisciplinary
Guibin Zhang, Lei Han, Lifei Zhang, Shuguang Song, Shuaiqi Liu
Summary: This study collected ultrahigh-pressure eclogites with coesite inclusions from the northern Dulan terrane in the North Qaidam orogen. Through zircon U-Pb dating and pressure-temperature calculations, it was found that these eclogites represent a continuous record from oceanic subduction to continental collision.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geology
Ji-Lei Li, Reiner Klemd, Gao-Feng Huang, Jay J. Ague, Jun Gao
Summary: The study reveals that the sulfur isotope compositions in subduction zones are influenced by the protolith of the subducting slab, and can be altered during high-pressure metamorphism. This suggests that the behavior of sulfur in subduction zones is influenced by pre-subduction processes.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
C. E. Seyler, J. D. Kirkpatrick, C. Faber, A. Licht, D. Silerova, C. Regalla
Summary: The Leech River Shear Zone (LRSZ) on southern Vancouver Island separates different types of rocks and may have originated as a subduction plate boundary. However, its tectonic context has yet to be fully determined. This study presents observations and analyses that provide insights into the structural and metamorphic history of LRSZ, suggesting its activity during the Eocene period.
Article
Geochemistry & Geophysics
Salviano da Silva, Andres Bustamante, Camilo Bustamante, Agustin Cardona, Caetano Juliani
Summary: The origin of the Raspas Metamorphic Complex and its metamorphic conditions have been unclear. This study provides new data on the geochemistry, metamorphism, and cooling age, shedding light on the protolith, metamorphic conditions, and tectonic implications for the Northern Andes.
Article
Geochemistry & Geophysics
Pan Tang, Shun Guo, Yueheng Yang, Yi Chen, Bin Su
Summary: This study investigates the compositions and behaviors of fluids/melts in subduction zones by detailed petrological and geochemical studies on UHP eclogites and epidote-quartz veins. The results reveal multistage metamorphic-fluid/melt evolution in the UHP eclogites and provide evidence linking fluid liberation to partial melting in eclogites. The occurrence of vein systems in HP-UHP rocks may provide high-permeability channels for the flow and escape of melts formed during later-stage processes.
Article
Geosciences, Multidisciplinary
Wasja Bloch, Bernd Schurr, Xiaohui Yuan, Lothar Ratschbacher, Sanaa Reuter, Sofia-Katerina Kufner, Qiang Xu, Junmeng Zhao
Summary: The research data suggests that the location and shape of the Pamir plateau may be caused by the forceful indentation of the Indian mantle lithosphere, resulting in complex interactions with the Asian slab. The Indian mantle indenter may lead to the delamination and overturning of the Asian slab, while also affecting the lithosphere of the Tarim basin.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Xianbin Lu, Bin Xia, Qin Yang, Yuanbao Wu
Summary: Lawsonite formation and preservation during continental subduction and exhumation were explored through the analysis of HP-LT eclogite samples from Gaoqiao in western Dabie. The presence of lawsonite in subduction zones is significant for understanding fluid activity, element migration, and crust-mantle interactions.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Fumiko Higashino, Tetsuo Kawakami, Shuhei Sakata, Takafumi Hirata
Summary: In this study, multiple periods of garnet-forming metamorphism in the Ser Rondane Mountains (SRM), East Antarctica were determined using in situ U-Pb dating of zircon and petrochronological approach utilizing distribution coefficient of rare earth elements (DREE) between zircon and garnet and REE patterns of zircon. This is the first report of multiple timings of garnet formation detected within single samples from the SRM. The results suggest that the SRM may be affected by a single long-lived regional metamorphism or polymetamorphism.
Article
Geochemistry & Geophysics
Jonathan C. Aitchison, Dominique Cluzel, Trevor R. Ireland, Renjie Zhou, Dongyang Lian, Daniel Patias, Zhen Yan, Jingsui Yang
Summary: This study demonstrates the association of zircons and rutiles recovered from ophiolitic rocks in New Caledonia with subducting sediments, indicating the transfer of solid-phase materials between plates. The presence of these minerals in forearc harzburgite suggests their incorporation into the mantle wedge host likely occurred at around 50-60 km depth within the subduction channel. The conveyance of high field strength elements within solid-state accessory mineral phases into suprasubduction mantle wedges represents a significant phenomenon at convergent margins globally.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Katja Bohm, Thomas Stevens, Anu Kaakinen, Yann Lahaye, Hugh O'Brien, Zhaoqun Zhang
Summary: Constraining the provenance of aeolian mineral dust is critical for understanding climate changes, atmospheric dust activity, circulation, and sediment generation. This study reviews the understanding of the provenance of aeolian Neogene Red Clay on the Chinese Loess Plateau (CLP) and introduces detrital rutile geochemistry as a tool to complement zircon U-Pb dating. The analysis suggests that the dominant sources of dust on the CLP are from proximal areas on the North China Craton (NCC), with contributions from other dry areas and the Yellow River. The study emphasizes the importance of multi-proxy single-grain provenance analyses for more reliable results.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Anxia Chen, Yi-Xiang Chen, Xiaofeng Gu, Zhen Zeng, Zicong Xiao, Hans-Peter Schertl, Xiqiu Han, Zi-Fu Zhao, Fang Huang
Summary: Serpentinites in subduction zones act as important fluid reservoirs for crust-mantle interaction and arc magma formation. The behavior of barium isotopes during the interaction between serpentinite-derived fluids and metamorphic rocks is poorly understood. This study investigates the barium isotope behavior during fluid-rock interaction in the Dora-Maira Massif.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Eirini M. Poulaki, Daniel F. Stockli, Megan E. Flansburg, Michelle L. Gevedon, Lisa D. Stockli, Jaime D. Barnes, Konstantinos Soukis, Kouki Kitajima, John W. Valley
Summary: Zircon U-Pb dating is a widely used technique for understanding the timing and rates of magmatic and metamorphic processes, as well as sediment provenance. This study combined various analytical techniques to reconstruct the metamorphic conditions recorded by zircon growth, providing valuable insights into the petro-tectonic evolution of high-pressure/low-temperature metamorphic rocks in subduction zones. The results suggest multiple episodes of non-magmatic zircon rim growth, with implications for the juxtaposition of different rock units during subduction and HP metamorphism.
Article
Geosciences, Multidisciplinary
Zi-Xuan Wang, Ren-Xu Chen, Yong-Fei Zheng, Qiong-Xia Xia, Zhi-Min Wang, Zhuang-Zhuang Yin, Zhaochu Hu
Summary: A combined study of garnet and zircon in metabasites from North Qaidam revealed different episodes of metamorphic processes with varying pressure, temperature, and time paths. Garnet and zircon from different growth stages exhibit distinct trace elements, isotopes, and involved minerals, indicating a complex metamorphic history involving eclogite- and granulite-facies conditions in the region.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Thermodynamics
Livia Majoros, Krisztian Fintor, Tamas Koos, Sandor Szakall, Ferenc Kristaly
Summary: The study aimed to prove the presence of graphite through thermal analysis methods and found that it accounts for 1.5-3% of the samples, often forming in flake-shaped aggregates. Raman spectroscopy results indicated that graphite was mainly formed in organic-rich shales.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Geochemistry & Geophysics
Huining Wang, Fulai Liu, Fang Wang, Lei Ji, Jianjiang Zhu, Ngo Xuan Thanh
Summary: The eastern Paleo-Tethyan Jinshajiang-Ailaoshan-Song Ma orogenic belt in the Southeast Tibetan Plateau represents the tectonic boundary between the Indochina and South China blocks. The lack of petrological evidence, particularly of high-pressure metamorphism, has hindered the tracing of the evolutionary history of the Paleo-Tethyan orogenic belt. This study provides mineralogical, geochemical, geochronological, and thermodynamic modeling data to reveal the protolith origins and metamorphic evolution of eclogite lenses/blocks and garnet-phengite schists from the Song Ma Suture Zone of Northwest Vietnam.
JOURNAL OF PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Yu-Wei Tang, Long Chen, Zi-Fu Zhao, Yong-Fei Zheng
Summary: Granitoids at convergent plate boundaries can be formed through either partial melting of crustal rocks or fractional crystallization of mantle derived mafic magmas. The former results in the reworking of pre-existing crust, while the latter contributes to the growth of continental crust. The synthesis of geochemical features indicates that syn-collisional granitoids in the Gangdese orogen are products of both the juvenile arc crust and the ancient continental crust. The compositional evolution from the early to late Eocene suggests a temporal change of magma sources in the continental collision zone.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geology
Qiang He, Shao-Bing Zhang, Yong-Fei Zheng, Ren-Xu Chen
Summary: The deeply subducted continental crust commonly undergoes partial melting during its exhumation, producing peritectic minerals that provide important records of crustal anatexis in continental subduction zones. A combined study was carried out in ultrahigh-pressure metamorphic gneisses from the Sulu orogen, revealing extensive crustal anatexis recorded by various features including folded leucosomes, cuspate K-feldspar and quartz, and multiphase crystal inclusions. The behaviour of peritectic minerals during decompressional melting provides insights into geochemical differentiation in collisional orogens.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Li-Tao Ma, Li-Qun Dai, Yong-Fei Zheng, Zi-Fu Zhao, Wei Fang, Kai Zhao
Summary: This study investigates the petrogenesis of high-Mg andesites (HMA) in northwestern Tianshan, western China and suggests that the mantle source of these rocks contains subducting terrigenous sediment-derived hydrous melts. The HMA samples analyzed are composed of basaltic andesite and andesite and exhibit arc-type trace element distribution patterns and weakly enriched Sr-Nd-Hf isotope compositions. The study also reveals that the mantle source of andesite contains more subducting sediment-derived hydrous melts than that of basaltic andesite. The addition of oceanic crust-derived aqueous solutions and terrigenous sediment-derived hydrous melts into the mantle wedge peridotite can account for the geochemical compositions of the studied HMA.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Geochemistry & Geophysics
He-Zhi Ma, Yi-Xiang Chen, Kun Zhou, Peng Gao, Yong-Fei Zheng, Xiang-Ping Zha, Xiao-Ping Xia, Zi-Fu Zhao, Fang Huang
Summary: The study of syn-exhumation granites in the Sulu ultrahigh-pressure metamorphic belt in east-central China revealed large-scale partial melting of deeply subducted continental crust in the terminal stage of continental collision during the Triassic period. The geochemical composition and zircon ages of the granites provide insights into their origin and evolution, showing significant differentiation mainly through fractional crystallization during magma evolution.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geochemistry & Geophysics
Lin Zhu, Ren-Xu Chen, Yong-Fei Zheng, Jing Wang, Bing Gong
Summary: Accurate determination of water content in garnet is important for understanding water transport to the deep mantle. This study combined FTIR and TC/EA-MS to obtain the infrared absorption coefficients of hydroxyl in garnet with different compositions. The results provide valuable data for future studies on eclogitic garnets.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2023)
Article
Geology
Qiang-Qiang Zhang, Xiao-Ying Gao, Yong-Fei Zheng
Summary: A study of granites from the Tongbai orogen in China reveals the complexity of crustal differentiation and granite petrogenesis. The minerals in these granites have different origins and their crystallization and fractional crystallization processes play important roles in determining the compositions of the granites.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Mei-Shan Zhao, Yi-Xiang Chen, Jia-Wei Xiong, Yong-Fei Zheng, Xiang-Ping Zha, Fang Huang
Summary: Serpentinite plays a crucial role in element mobility and Mg isotope fractionation during the serpentinization of peridotites. A geochemical study of serpentinites and associated peridotites in southern Tibet reveals Mg loss during serpentinization, distinct trace element compositions of serpentinites compared to forearc serpentinites, and the importance of seafloor serpentinization in changing the Mg isotope composition of mantle sources and seawater. These findings contribute to a better understanding of element and isotope dynamics in geological processes.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Zi-Yue Meng, Shan-Yong Zhou, Xiao-Ying Gao, Min Ji, Yong-Fei Zheng
Summary: An integrated study was carried out on orthogneisses and paragneisses from the Yardoi gneiss dome in the Himalaya. The results indicate that the gneisses underwent three metamorphic stages and shared similar P-T paths. The crustal rocks were metamorphosed at 36-40 km during the continental collision, different from UHP eclogites in western Himalaya. There were two episodes of decompressional exhumation, indicating secular changes in thermal state and dynamic regime in the collisional orogen.
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Yong-Fei Zheng
Summary: Plate tectonics is a theory about the movement of the Earth's crust, with the crust being divided into different plates that move relative to each other. This theory explains the processes of continental drift, seafloor spreading, and lithospheric subduction, and how they shape the Earth's surface over time.
SCIENCE CHINA-EARTH SCIENCES
(2023)
Article
Multidisciplinary Sciences
Yi-Xiang Chen, Kun Zhou, Qiang He, Yong-Fei Zheng, Hans-Peter Schertl, Kun Chen
Summary: The ultrahigh-pressure metamorphism in the Sesia zone of Western Alps is reported for the first time, showing deep subduction of continental crust to mantle depths of >80 km. The deep subduction is driven by the distal push of continental breakup or seafloor spreading, rather than by the proximal pull of the subducting oceanic slab. The Sesia Zone provides an excellent target for exploring subduction dynamics in this tectonic setting.
NATIONAL SCIENCE REVIEW
(2023)
Article
Geochemistry & Geophysics
Wei Fang, Li-Qun Dai, Xiang Fu, Zi-Fu Zhao, Bing Gong, Yong-Fei Zheng
Summary: Studies have shown that the mafic arc magmas have higher molybdenum isotope values, which can be attributed to the incorporation of sediment-derived melts during subduction of the Paleo-Pacific Plate. This finding is important for understanding the recycling of crustal components at convergent plate margins.
Article
Geosciences, Multidisciplinary
Zhi-Min Wang, Ren-Xu Chen, Yong-Fei Zheng, Shuning Li, Lin Zhu, Bing Gong, Xiang-Ping Zha, Wan-Cai Li
Summary: By studying water in garnet and omphacite in ultrahigh-pressure metamorphic eclogites, it is found that water can exist as structural hydroxyl and molecular H2O and undergo inter-transformation during subduction zone metamorphism. Molecular H2O in garnet mainly originates from external fluid and transforms to structural hydroxyl during exhumation. There is a positive correlation between molecular H2O and structural hydroxyl in garnet. Hydroxyls in both anhydrous and hydrous minerals transform to molecular H2O during exhumation and redistribute into garnet or retrograde minerals. The addition of molecular H2O increases the structural hydroxyl content in garnet but decreases the delta D value, affecting the accurate estimation of water content in peak garnet. Omphacite tends to be water-saturated at high-pressure conditions and its water content is controlled by Ca-Eskola. The subducting mafic crust can transport a significant amount of water to subarc depths, leading to the formation of relatively water-rich mantle regions.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Guang Yang, Ren-Xu Chen, Yong-Fei Zheng, Qiong-Xia Xia, Yong-Jie Yu, Kun Li, Zhaochu Hu, Bing Gong, Xiang-Ping Zha
Summary: This study investigates the growth conditions and evolution of zircon minerals at different stages of anatectic metamorphism in the Bohemian Massif. The results show that the formation of zircon is closely related to the metamorphic conditions, and the chemical composition and crystallization characteristics of zircon can vary in different metamorphic environments.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yong-Fei Zheng
Summary: Partial melting of crustal rocks contributes to the formation of complementary granulites and granites in collisional orogens, but the petrogenetic relationship between migmatites and granites is still unclear. In this study, a comprehensive analysis of field geology, petrography, and geochemistry was conducted on the leucosomes, leucocratic dikes, and leucogranites in the Cona area of eastern Himalaya. The results show that the leucosomes and leucocratic dikes, which originated from different source rocks, share similarities in composition, while the leucogranites, formed from mixed sources, have distinct geochemical characteristics. The two groups are likely the products of different anatectic processes in the source, linked to hydration and dehydration melting, respectively. The spatiotemporally coupled dehydration-hydration anatectic processes play a crucial role in the formation of coherent granite, migmatite, and granulite in collisional orogens.
Review
Geosciences, Multidisciplinary
Qiangqiang Zhang, Xiaoying Gao, Renxu Chen, Yongfei Zheng
Summary: This study presents an integrated study of metamorphic records along the China Central Orogenic System (CCOS) to shed light on the tectonic evolution of the Eastern Tethys tectonic domain. The results show that continental subduction and collision mainly occurred in the early and later convergent stages, while intracontinental rifting mainly occurred in the post-convergent stage.
SCIENCE CHINA-EARTH SCIENCES
(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)