Article
Geosciences, Multidisciplinary
Yong Fu, Zhen Yang, Chao Li, Peng Xia
Summary: The study focuses on the enrichment of PGEs in polymetallic layers found in lower Cambrian black shales in southern China. Results show that PGEs are enriched in these layers, while the surrounding country rocks are barren, with distribution patterns similar to basic-ultrabasic rocks.
FRONTIERS IN EARTH SCIENCE
(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
Geology
Lingang Xu, Jingwen Mao
Summary: The Early Cambrian black shales in South China exhibit a variety of mineralization, including polymetallic Ni-Mo sulfide and vanadium. Vanadium and polymetallic Ni-Mo sulfide ores have similar stratigraphic correlation and trace element composition, but differ in formation conditions and oxygen content.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Yingnan Zhang, Ziwei Wang, Xin Yang, Linqing Huang, Yiliang Li, Liping Qin
Summary: The Lower Cambrian Niutitang Formation in Southwest China contains black shale enriched in sedimentary exhalative Ni-and Mo-sulfides. High-resolution structures and isotopic compositions of Ni-and Mo-extremely enriched sulfidic spheroids were observed. Ni-sulfides are mineralized by hydrothermal-fluid-addition, while Mo-sulfides have a seawater source. These findings provide insights into the biogeochemical cycles and the Cambrian Explosion.
Article
Geology
Zhen Yang, Pan Wu, Yong Fu, Wenlang Qiao, Yan Qin, Chao Li, Peng Xia, Chuan Guo, Xuanlin Long, Long Wu
Summary: Black shales were widely distributed during the early Cambrian, with Ni and Mo enriched in them, only mined in Guizhou and Hunan, South China. The genesis of the deposits has multiple interpretations, with element migration and precipitation controlled by redox. Fe isotope analysis of pyrite in the Ni-Mo deposit showed that all pyrite were formed in sedimentary and the formation of a polymetallic Ni-Mo layer involves hydrothermal fluid.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
John Parnell
Summary: Vanadium in carbonaceous deposits, developed during the Cryogenian-Cambrian period, became available to the surface when anomalously high levels were introduced in large igneous provinces during the Neoproterozoic. Glacial erosion transported vanadium to the oceans, along with trace elements that engendered organic carbon accumulation. This combination of vanadium and organic carbon provides a model to support exploration for further resources.
ORE GEOLOGY REVIEWS
(2022)
Article
Geography, Physical
Lin Wu, Guangyou Zhu, Lei Yan, Xueqian Feng, Zhiyao Zhang
Summary: This study integrated different data to analyze the tectonic-sedimentary evolution of the Tarim Basin and its impact on the distribution of Lower Cambrian source rocks. The spatial distribution of the Lower Cambrian source rocks was controlled by the paleo-topography of the late Ediacaran basin, with black siliceous shales showing excellent petroleum potential in the northern region.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Guangyou Zhu, Tingting Li, Kun Zhao, Chao Li, Meng Cheng, Weiyan Chen, Huihui Yan, Zhiyao Zhang, Thomas J. Algeo
Summary: This study reports on the Mo isotopic compositions and iron speciation data of black shales from the Tarim block during the early Cambrian, providing insights into the paleoenvironment and oxygenation conditions in the ancient seawater.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Lin Wu, Pengfei Wang, Chunyu Zhang, Xingqiang Feng, Zhuliang Qian, Lei Zhou
Summary: Neoproterozoic-Cambrian black shales in the Shunbei and Fuman regions of the Tarim Basin, China, are important hydrocarbon source rocks. The hydrocarbon generation from these shales is complex, with liquid petroleum found in reservoirs at depths of 6000-8000 m. The ultra-deep tectonic evolution of the northern Tarim Basin and its effects on hydrocarbon generation from black shales were investigated based on drilling, seismic, and well testing data.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Peng Xia, Fang Hao, Jinqiang Tian, Wenxi Zhou, Yong Fu, Chuan Guo, Zhen Yang, Kunjie Li, Ke Wang
Summary: This study investigates the distribution and enrichment mechanism of organic matter in the Early Cambrian Niutitang black shale in the Upper Yangtze Region. The results show that the distribution and enrichment of organic matter are influenced by factors such as primary productivity, redox conditions, and terrigenous input in different sedimentary environments.
Article
Energy & Fuels
Mengjuan Zhang, Chao Wang, Zhennan Han, Kangjun Wang, Zhanguo Zhang, Guoqing Guan, Abuliti Abudula, Guangwen Xu
Summary: The Ni-Mo/Al2O3 catalyst calcinated using infrared radiation heating showed superior catalytic performance in the HDS of shale oil, resulting in lower sulfur content in the product oil compared to the catalyst calcinated in a conventional electric furnace. Characterization of the catalysts revealed that the infrared-heating catalyst had higher BET surface area, smaller and narrower metal particle size distribution, higher binding energy between Mo and S, and more oxygen-deficient sites than the conventionally heated catalyst.
Article
Geography, Physical
Russell D. C. Bicknell, James D. Holmes, Stephen Pates, Diego C. Garcia-Bellido, John R. Paterson
Summary: The Cambrian explosion marked the rapid development of complex marine ecosystems on Earth due to predator-prey interactions, which led to the evolution of biomineralised exoskeletons and shell-crushing predators. Injured trilobite specimens from Kangaroo Island, South Australia show evidence of attacks mostly on the posterior thorax, suggesting predators attacked from behind. Larger individuals were more likely to survive attacks and exhibit healed injuries, indicating smaller individuals were likely consumed during an attack.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geochemistry & Geophysics
Xiangcai Li, Yongbin Wang, Xuance Wang, Jiaqi Cai, Yunkang Guo, Song Lin
Summary: This study focuses on the Mo deposits in the Xianlin area of Zhejiang Province during the Late Jurassic period and investigates the controlling factors and genetic relationship of Re-content variation. The results indicate that the Xianlin polymetallic mineralization is genetically related to the Late Jurassic granodiorite. Analysis of reliable Re contents and Re-Os isotope age data reveals a decreasing trend in Re contents from the Jurassic to Cretaceous period. Based on previous models, the study suggests that the Re-enriched Mo mineralization formed during compressive tectonic setting, while the Re-poorer Mo/Mo-Pb-Zn mineralization formed during extensional back-arc setting.
Article
Geology
Xuerui Fu, Lingang Xu, Hao Yan, Huishou Ye, Jianhua Ding
Summary: The formation of black shale-hosted vanadium deposits is influenced by metal supply, biological processes, and marine sedimentary environments. The mineralogy and mineralization processes of vanadium-bearing minerals in these deposits are still not well understood. This study investigated the geochemistry and mineralogy of the early Cambrian black shale-hosted Zhongcun vanadium deposit. The results suggest the presence of five bearing minerals, dominant roscoelite, and the formation of the vanadium ores in a redox-stratified basin with a redox-variable sedimentary environment.
ORE GEOLOGY REVIEWS
(2023)
Article
Environmental Sciences
Kristina Ahlgren, Viktor Sjoberg, Bert Allard, Mattias Backstrom
Summary: The study demonstrated the potential long-term impact of black shale waste deposits on the surrounding environment, mainly due to the influence of metal elements from shale waste on groundwater quality, including pH and redox conditions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
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)