Carboniferous-Permian sedimentary filling process in eastern North China and its response to tectonic evolution of provenance area
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TE122.2

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    Abstract:

    Affected by the subduction and closure of the Paleo-Asian Ocean and the collision between the northern margin of the North China Plate and the Siberian Plate,the Inner Mongolia Paleo-Uplift underwent important tectonic uplift during the CarboniferousPermian period,and it controls the formation,development,and filling evolution of the sedimentary basin in eastern North China and has become the provenance area of the basin. By studying sedimentology,petrology,mineralogy,and geochemistry of three field geological profiles and a large number of drilling cores in the basin area,detailed sedimentary system and tectonic evolution of provenance area during the Carboniferous-Permian period in eastern North China were analyzed in this article. The results show that the paleogeographic environment of the Carboniferous-Permian sedimentary basin in eastern North China has experienced the evolution process of the epicontinental sea,sea-land transition,and continental facies. Platform-barrier coast sedimentary system,delta sedimentary system,and fluvial sedimentary system have been developed from early to late,and sedimentary facies include carbonate platforms,tidal flat,lagoons,barrier islands,delta,meandering rivers,braided rivers,etc. The composition of detrital particles and geochemical characteristics of sandstone indicate that the provenance area has the characteristics of an active continental margin recycling orogenic belt and island arc. The parent rock assemblage is composed of early Paleozoic flint-rich banded carbonate rocks,early sedimentary cap rocks such as Meso-Neoproterozoic clastic rocks and epimetamorphic rocks,and Late Paleozoic island arc volcanic rocks,plutonic intrusive rocks,and basement metamorphic rocks. The sedimentation,filling rate,sedimentary evolution process,variation of clastic grain composition,and petrogeochemical characteristics of the Carboniferous-Permian basin in eastern North China fully respond to the tectonic evolution process of the provenance area with the orogenic belt. Specifically,the provenance area undergoes intracontinental uplift due to continuous ocean-continent subduction and the formation of an island arc in the continental margin during the sedimentary period of the Benxi and Taiyuan Formations. In the sedimentary period of the Shanxi Formation-Lower Shihezi Formation,the paleo-Asian ocean gradually closes,and the collision between plates makes the uplift of the provenance area intensified with fold and thrust. During the sedimentary period of the Upper Shihezi Formation,the provenance area experiences an intense collision between plates and comprehensive orogenesis.

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MA Shuai, WANG Yongshi, WANG Xuejun, CHEN Shiyue, JING Anyu, TIAN Wen, XIN Yanfang. Carboniferous-Permian sedimentary filling process in eastern North China and its response to tectonic evolution of provenance area[J]. Petroleum Geology and Recovery Efficiency,2023,30(4):1~20

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  • Online: August 02,2023
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