Article
Energy & Fuels
Zixuan Liu, Detian Yan, Duoen Yuan, Xing Niu, Haijiao Fu
Summary: This study investigates the paleoenvironments, hydrothermal activity, and seawater restriction of the lower Cambrian Shuijingtuo Formation. The results suggest that hydrothermal activity and restricted water conditions are beneficial for organic matter accumulation.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Zhanghu Wang, Jingqiang Tan, Jason Hilton, Jeffrey Dick, Zhigang Wen
Summary: This study investigates the host and geochemical cycle of redox-sensitive elements (V and Zn) in the Niutitang Formation shale in South China during the early Cambrian. Results show that sphalerite is the primary host of Zn, while organic matter, illite, and anatase minerals contribute to the V-rich host. The study suggests that redox conditions, organic matter, and the trace element inventory of seawater control the V and Zn geochemical cycles in the early Cambrian paleo-ocean.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Kaixun Zhang, Xiaoshi Li, Yuxuan Wang, Wen Liu, Yuxi Yu, Lei Zhou, Weiping Feng
Summary: A comprehensive study of the organic-rich shales in the Lower-Middle Cambrian Niutitang and Wunitang Formations in South China found that organic matter enrichment was mainly controlled by redox conditions and paleo-productivity. The restrictive paleogeographic setting allowed for limited water interchange between the outer shelf and open ocean, resulting in high nutrient flux and enhanced primary producer blooms in surface waters. The intermittent renewal of connections to open ocean water during sea level rise accelerated the consumption of organic matter in the depositional area.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Bixiao Xin, Fang Hao, Wenzhong Han, Qilu Xu, Bojie Zhang, Jinqiang Tian
Summary: The Ek(2) shale is an excellent hydrocarbon source rocks interval with abundant thermally mature Type I and II kerogen. Changes in paleoclimate conditions and terrigenous detrital input played a critical role in controlling organic enrichment in the Ek(2) shale. Primary productivity was identified as the most important factor influencing organic matter enrichment, with anoxic bottom water conditions leading to the greatest enrichment of organic matter in the lower part of the Ek(2) shale.
MARINE AND PETROLEUM GEOLOGY
(2021)
Review
Geosciences, Multidisciplinary
Bei Liu, Maria Mastalerz, Juergen Schieber
Summary: This article reviews the petrographic characteristics of dispersed organic matter (DOM) in black shales under the scanning electron microscope (SEM). The correlative microscopy technique combining reflected-light and electron microscopy is found to be the most effective method for identifying both the types and hosted pores of organic matter. Factors controlling the formation and preservation of organic matter-hosted pores are also discussed. The findings suggest that the specific surface area and pore volume of organic matter in black shales follow parabolic patterns with increasing thermal maturity.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Huifei Tao, Zhen Qiu, Yongqiang Qu, Jun Liu, Zhen Qin, Zaibo Xie, Junli Qiu, Bei Liu
Summary: This study investigates the influence of hydrothermal activity on the enrichment of organic matter in lacustrine shales through an analysis of the Middle Permian Lucaogou Formation (LCGF) in the Jimusar Sag, Northwest China. The results show that hydrothermal activity enhances organic matter production and leads to its enrichment in the studied sediments.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Zijian Li, Devon B. Cole, Sean M. Newby, Jeremy D. Owens, Brian Kendall, Christopher T. Reinhard
Summary: Stable thallium (Tl) isotope data from organic-rich sedimentary rocks in Australia suggest that the Tl isotope composition of seawater at 1.36 Ga was homogeneous on a global scale, reflecting a low-O2 ocean-atmosphere system during the Mesoproterozoic. In contrast, the Tl isotope system in the older Wollogorang Formation may have been perturbed by post-depositional hydrothermal alteration.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Energy & Fuels
Juan Teng, Maria Mastalerz, Bei Liu
Summary: This study investigates the characteristics of two types of AOM in marine black shales from the Illinois Basin, finding that low-reflectance AOM is the dominant organic matter, while micrinized AOM is rare in the New Albany Shale. There are significant differences in reflectance, petrographic characteristics, and chemical structure between the two types, and they have different formation mechanisms.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Energy & Fuels
Zixuan Liu, Detian Yan, Xuebin Du, Shuangjian Li
Summary: The study reveals that the organic-rich shales of the Niutitang Formation in the Micangshan-Hannan Uplift area are primarily influenced by factors such as sea level changes, climate, and sediment flux. The enrichment of organic matter in the shales is mainly controlled by bottom water oxygen conditions, primary productivity, and paleoenvironmental conditions.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Guangyou Zhu, Kun Zhao, Tingting Li, Zhiyao Zhang, Shunlin Tang, Pengju Wang
Summary: The lower Cambrian black shales reflect a significant anoxic event during a global transgression, recording synergistic changes in the marine environment and biological evolution. High Hg contents observed in the Danquan section of South China suggest extensive volcanic activities during the early Cambrian, with redox conditions being euxinic. Volcanic activities and geographical settings constrain the evolution of life, as well as redox conditions.
JOURNAL OF ASIAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Yaowen Wu, Hui Tian, Tengfei Li, Sui Ji, Zeyang Liu, Xianming Xiao, Luhua Xie
Summary: The study in South China during the early Carboniferous period found that terrestrial organic matter played a significant role in paleo-environmental changes and organic matter deposition in black shales. Key indicators such as sedimentary delta N-15 values and the organic matter compositions highlighted the contribution of terrestrial OM to marine sediments. In summary, the transportation of large quantities of TOM from land to ocean may have led to a significant decrease in atmospheric pCO(2) levels and subsequent cooling climate.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Energy & Fuels
V. Laranjeira, J. Ribeiro, N. Moreira, P. Nogueira, J. G. Mendonca Filho, F. Rocha, D. Flores
Summary: This study aims to investigate the association between Silurian black shales and Cu ore deposition in the Sousel-Barrancos metallogenic belt. Petrographic, geochemical, and mineralogical analysis of the black shales reveal significant Cu enrichment in the supergene enrichment domains, which is not directly related to organic carbon content. The mobilization of hydrothermal fluids, possibly of magmatic source, contributed to the discrepant maturation of organic matter in black shales.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
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
Yufei Hao, He Liu, Qian Chen, Weidong Sun, Jing Huang
Summary: Studies have shown that the Ediacaran shales in South China do not exhibit high enrichments of redox-sensitive elements (RSEs), suggesting a widespread anoxic ocean during that time. However, outliers with high RSE enrichments are closely tied to anoxic conditions. The high RSE enrichments in the Doushantuo Formation are primarily related to the ocean environment and intermittent RSE-enriched events in the Nanhua Basin.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Tian Dong, Chuan Wang, Xing Liang, Gaocheng Wang, Shu Jiang
Summary: This study investigates the relative importance of productivity and anoxia in the accumulation of organic matter in the Wufeng-Longmaxi black shales. The research combines various analytical methods to understand the evolution of factors controlling organic matter accumulation across the Ordovician-Silurian boundary. The findings highlight the significance of elevated productivity driven by upwelling in the accumulation of organic matter.
MARINE AND PETROLEUM GEOLOGY
(2022)
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)
