Sedimentary Sequence and Depositional Environment Evolution of Upper Jurassic-Lower Cretaceous Strata in the Southern Margin of Junggar Basin

doi:10.7657/XJPG20200109

Abstract

Abstract:

The sedimentary facies of the Upper Jurassic-Lower Cretaceous strata in the southern margin of Junggar basin can be divided into meandering river, alluvial fan, alluvial fan transformed by lake and shallow lake facies. According to the architecture element analysis, 10 main lithofacies is classified, among which polymictic Gm₁ supported by matrix is massive maroon conglomerate with fine-coarse grain size, poor sorting and roundness; polymictic Gm₂ supported by grain is massive brown conglomerate with fine-medium grain size, moderate-poor sorting and roundness; Gm₃ supported by grain is massive greyish green or orange fine conglomerate with good sorting and roundness. Some seismite structures were developed during the depositional periods of Gm₁ and Gm₂. During the Middle to Late Jurassic, the climate was arid, structural activities were active in the northern Tianshan, the basin was filled rapidly and the accommodation space reduced and meandering river deposits were developed in the Upper Jurassic Qigu formation. Under the influence of the rapid closure of the Mongol-Okhotsk Ocean, the extensional tectonic setting evolved to a local compressive setting, structural activities in the northern Tianshan continued, the basin contracted, the accomodation space reduced, and the boundary of the basin withdrew from the central Tianshan to northern Tianshan. During the deposition period of the Upper Jurassic Kalazha formation, brownish red fluvial fan sediments were widely developed in the southern margin of Junggar basin and the filling of the Jurassic basin ended. During the deposition period of the Lower Cretaceous Qingshuihe formation, the Mongolia-Okhotsk Ocean closed, the tectonic setting became stable, the basin expanded and the accommodation space increased, large-scale rapid lake transgression occured, the climate became humid, then fluvial fan deposits were developed in the southern margin, followed by shallow lake deposits, greyish green or orange lacustrine conglomerate and fine deposits, indicating the beginning of the filling of a Cretaceous basin.

Key words: Junggar basin, Jurassic, Cretaceous, basin-range evolution, seismite structure, depositional environment evolution, Qigu forma- tion, Kalazha formation, Qingshuihe formation

CLC Number:

TE111.3

GUAN Xutong, WU Chaodong, WU Jian, ZHOU Jiaquan, JIAO Yue, ZHOU Rong, YU Qingsen. Sedimentary Sequence and Depositional Environment Evolution of Upper Jurassic-Lower Cretaceous Strata in the Southern Margin of Junggar Basin[J]. Xinjiang Petroleum Geology, 2020, 41(1): 67-79.

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