期刊论文详细信息
Frontiers in Earth Science
Carboniferous to Early Permian tectono-sedimentary evolution in the western Junggar Basin, NW China: implication for the evolution of Junggar Ocean
Earth Science
Xuefeng Qi1  Shan Lu1  Yanzhao Wei1  Fan Yang1  Jianzhong Li2  Baoli Bian3  Hailei Liu3  Hao Yang4 
[1] PetroChina Research Institute of Petroleum Exploration and Development, Beijing, China;PetroChina Tuha Oilfield Company, Hami, China;PetroChina Xinjiang Oilfield Company, Karamay, China;School of Energy Resources, China University of Geosciences, Beijing, China;
关键词: basin evolution;    western Junggar Basin;    forearc basin;    backarc basin;    closure time;    Junggar Ocean;   
DOI  :  10.3389/feart.2023.1237367
 received in 2023-06-09, accepted in 2023-08-07,  发布年份 2023
来源: Frontiers
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【 摘 要 】

The discovery of Carboniferous hydrocarbon source rocks in the Mahu-Shawan Sag has implied considerable exploration potential in the Carboniferous strata in the western Junggar Basin. However, controversy has long surrounded when and how the Junggar Ocean was eventually closed, leading to a poor understanding of the Carboniferous basin evolution and the continental growth of the Central Asian Orogenic Belt. We performed stratigraphic and geochronologic studies to establish the chronostratigraphic framework of the western Junggar Basin to better understand its tectonic-sedimentary evolution during the Carboniferous-Early Permian. Three tectonostratigraphic units in the southern West Junggar region have been identified as Early Carboniferous shallow-deep marine sequences, Late Carboniferous coast-shallow marine sequences, and Early Permian continental sequences. The Carboniferous strata are similar to forearc and backarc-rift sequences in the Western Fault Belt and the Mahu-Shawan Sag, respectively. The Lower Permian strata in the southern West Junggar region are all continental sequences. Seismic profiles indicate extensional settings in the early stage of Late Carboniferous and Early Permian but a compressional setting at the end of Late Carboniferous. Geochemical data have suggested a Carboniferous continental arc setting and an Early Permian within-plate extensional setting. Meanwhile, calc-alkaline arc magma migrated from the Zhongguai High to the Western Fault Belt at the end of the Late Carboniferous. Collectively, the tectonic-sedimentary evolution in the Carboniferous-Early Permian of the southern West Junggar region can be divided into three stages: 1) Early Carboniferous subduction, 2) Late Carboniferous slab roll-back, and 3) Early Permian intra-continental evolution stage. This model constrains the closure of the Junggar Ocean at the Late Carboniferous.

【 授权许可】

Unknown   
Copyright © 2023 Yang, Li, Lu, Bian, Liu, Wei, Qi and Yang.

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