Article
Geology
Pei Guo, Huaguo Wen, Changzhi Li, Jun Jin, Haiyan Lei
Summary: In the Late Paleozoic Fengcheng Formation of the NW Junggar Basin, NW China, reedmergnerite primarily forms through temperature control and diagenetic replacement, influenced by boron from original hydrothermal fluids. Enrichment is also affected by lake water pH and salinity.
ORE GEOLOGY REVIEWS
(2021)
Article
Geography, Physical
Thomas Filek, Felix Hofmayer, Iris Feichtinger, Bjoern Berning, Juergen Pollerspoeck, Jennifer Zwicker, Daniel Smrzka, Joern Peckmann, Matthias Kranner, Oleg Mandic, Bettina Reichenbacher, Andreas Kroh, Alfred Uchman, Reinhard Roetzel, Mathias Harzhauser
Summary: The study re-evaluated the fossil fauna and flora, as well as lithology of the Eferding Formation in Upper Austria. It showed the impact of sea-level fluctuations on marine biota and terrestrial climate, with the presence of phosphatic nodules indicating eutrophication in the coastal environment.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geochemistry & Geophysics
Wang Xu, Guodong Zheng, Xiangxian Ma, Danielle Fortin, Ching Chou Fu, Qi Li, Georgy Alekseevich Chelnokov, Valery Ershov
Summary: The analysis of the chemical and stable carbon isotopic composition of seepage gases from three mud volcanoes compared to their corresponding reservoir gases showed clear alterations, mainly due to advective and diffusive processes, gas-water-rock-microbe interactions and seismic activity. The molecular and isotopic fractionations caused by these geochemical processes provide distinctive indicators for understanding gas migration and should be considered when assessing gas origin and source rocks based on seepage gases.
APPLIED GEOCHEMISTRY
(2022)
Article
Geochemistry & Geophysics
Jack G. Murphy, Anne-Sofie C. Ahm, Peter K. Swart, John A. Higgins
Summary: The records of lithium isotopic composition in seawater preserved in shallow-marine carbonate sediments are valuable for studying the links between silicate weathering, clay formation, global carbon cycle, and Earth's climate over geological time. This study presents measurements of lithium isotopic composition in Neogene shallow-marine carbonates and demonstrates the effects of mineralogy and diagenetic alteration on the variability of bulk sediment δ Li-7 values. The findings suggest that robust 'snapshots' of seawater δ Li-7 values in the past can be obtained from shallow-water marine carbonate sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Energy & Fuels
Wenlong Dang, Gang Gao, Xincai You, Jun Wu, Shiju Liu, Qi Yan, Wenjun He, Liulinbo Guo
Summary: Based on geological and geochemical analysis, as well as thermal simulation experiments, the study investigates the source, genesis, and distribution of different types of oils in the Mahu large oil province. It finds that the Permian Fengcheng Formation has the highest hydrocarbon generation potential, while other formations have lower potential with different types of organic matter. The oils in the Mahu Sag can be classified into three types, with different distribution patterns and levels of maturity. The study provides important guidance for oil exploration and prediction in the Mahu Sag.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2023)
Article
Energy & Fuels
Changchun Pan, Jun Wang, Shuang Yu, Xulong Wang, Baoli Xiang, Jiande Liao, Jiangling Ren, Ertin Li, Xuejun Zhang
Summary: The southwestern Junggar Basin in China is an attractive region for oil exploration due to potential source beds in various geological formations. Extensive analysis of crude oils and extracted oils from different reservoir rocks revealed different oil groups and origins based on molecular parameters, with clear distinctions between Permian lacustrine, Jurassic terrigenous, and mixed sources.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Tingting Wang, Jian Cao, Alan R. Carroll, Dongming Zhi, Yong Tang, Xulong Wang, Yuwen Li
Summary: This paper presents a comprehensive data set on sodium carbonate evaporites found in the Fengcheng Formation in northwestern China, offering insights into their mineralogy, age, and formation processes. The study suggests that these deposits were formed in extensional grabens hosting hypersaline lakes, which were influenced by coeval volcanic activity.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Environmental Sciences
Xiangxian Ma, Yong Ma, Li Zhang, Wasim Sajjad, Wang Xu, Yuanyuan Shao, Daniele L. Pinti, Qiaohui Fan, Guodong Zheng
Summary: The study collected muddy water and gas samples from the most active mud volcanism region in China over the course of a year, analyzing them for major molecular compositions. The emitted gases primarily consist of CH4, with higher amounts of cations and anions in water during spring and summer compared to autumn and winter. Additionally, there is a clear seasonal trend in gas fluxes.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Pei Guo, Huaguo Wen, Luis Gibert, Jun Jin, Jian Wang, Haiyan Lei
Summary: This study describes and interprets the mineral and facies assemblages of lacustrine shales that occurred in an ancient volcanic-related alkaline playa-lake, considering the importance of diagenetic pathways. Differentiated laminated lithofacies in the Early Permian Fengcheng Formation were influenced by depositional environments, affecting subsequent diagenetic pathways.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geography, Physical
Dadong Liu, Qingqing Fan, Chen Zhang, Yang Gao, Wei Du, Yan Song, Ziya Zhang, Qun Luo, Zhenxue Jiang, Zhixin Huang
Summary: This study systematically investigated the Lucaogou Formation in different sag areas of the southern Junggar Basin and found that it was generally deposited under semiarid to arid conditions with dysoxic-anoxic conditions prevailing. The salinity levels varied in different sag areas, with the Jimsar Sag exhibiting the highest salinity. The deposition of the Lucaogou Formation was influenced by the deglaciation of Gondwanaland, resulting in a lake transgression trend.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Wenbin Tang, Yuanyuan Zhang, Georgia Pe-Piper, David J. W. Piper, Zhaojie Guo, Wei Li
Summary: By analyzing seismic reflection profiles, detrital petrology, zircon U-Pb ages, and other regional geological data, this study investigates the tectonic evolution and geodynamic mechanics of the Junggar Basin, revealing the Permian rifting processes and thinning of the crust beneath the basin. The study highlights the location of initial rift axis controlled by the juxtaposition of thin and weak crust beneath the basin and relatively strengthened thick crust, attributing it to the cooling of A-type granites.
Article
Geochemistry & Geophysics
Jun Wang, Yangtong Cao
Summary: The sulfate isotope record of marine sedimentary sulfate can determine global variations in seawater sulfate composition, with Paleocene sulfur isotope composition showing influence from oxidation events and seawater sulfide. Gypsum samples from the Yarkand Basin indicate an average sulfur isotopic composition of 17.7 parts per thousand, reflecting potential oxidation events or bacterial reduction of seawater sulfide during the Paleocene epoch. Additionally, the sulfur isotopic composition of seawater in the northeastern part of the eastern Paratethys ocean ranged from 15.0 parts per thousand to 20.6 parts per thousand in the Paleocene, suggesting potential existence of a biological sulfur cycle in this region.
Article
Geosciences, Multidisciplinary
Fan Yang, Jianzhong Li, Shan Lu, Baoli Bian, Hailei Liu, Yanzhao Wei, Xuefeng Qi, Hao Yang
Summary: The discovery of Carboniferous hydrocarbon source rocks in the Mahu-Shawan Sag indicates significant exploration potential in the Carboniferous strata in the western Junggar Basin. However, the closure of the Junggar Ocean has been a subject of controversy, resulting in a limited understanding of the basin's evolution. In this study, stratigraphic and geochronologic analyses were conducted to establish the chronostratigraphic framework of the western Junggar Basin during the Carboniferous-Early Permian. The results suggest three tectonostratigraphic units and a three-stage tectonic-sedimentary evolution in the southern West Junggar region.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Energy & Fuels
Xiu-Jian Ding, Wen-Jun He, Hai-Lei Liu, Xu-Guang Guo, Ming Zha, Zhong-Fa Jiang
Summary: In this paper, geological and geochemical research techniques were used to evaluate the geochemical variability of the lacustrine shale in the Jimsar Sag, Junggar Basin. The study found that the organic matter primarily originated from phytoplankton, aquatic algal-bacterial organisms, and cyanobacteria. Based on the comprehensive analysis of the origin and production of organic matter, as well as its depositional environment and preservation conditions, two organic matter accumulation models were proposed to explain the distribution of the organic-rich shale.
Article
Energy & Fuels
Mao-Guo Hou, Ming Zha, Xiu-Jian Ding, He Yin, Bao-Li Bian, Hai-Lei Liu, Zhong-Fa Jiang
Summary: Biodegradation can obscure or alter the original characteristics of oil biomarkers, making it difficult to trace the source of biodegraded oil. This study investigated the impacts of biodegradation on oil-source correlation and oil charging history to trace the source and reveal the mixing process of biodegraded oil. The results showed that biodegraded oil in the study area was a mixture sourced from two different formations.