鄂尔多斯盆地西缘中奥陶统克里摩里组深水等深流溢岸混合沉积

doi:10.11743/ogg20180610

Abstract

Abstract: The deep-water contourites are widely developed in the Middle Ordovician Kelimoli Formation in Zhuozishan area,western margin of Ordos Basin.The Shixiagu outcrop thereto is generally regarded as an ideal section for studying the contourites of the Darriwilian stage for its complete stratum and obvious lithological variations.Here we focus on the mechanism of limestone associations alternating with shale in the middle Kelimoli Formation based on outcrop observations,study of thin sections in labs,data from relevant geochemical tests and previous works.The results show that: ① the middle part of Kelimoli Formation consists of ten limestone associations which could be grouped into three cycles; ② the single limestone layer pinches out in shale with different forms and patterns of lens; ③ a succession of parallel layer-homogeneous layer-parallel layer and streaky structures in the shape of gentle ripples are developed in the limestone,displaying alternating zones of lime mud and very fine crystalline under microscope.In combination of previous research,we may conclude that the mixed sequences consisting of limestone and shale in the middle Kelimoli Formation can be divided into two types,one is the mixed sequence of terrigenous clastics with carbonate,and the other is the mixed sequence of carbonate(terrigenous clastics)with diamictite,and their genetic mechanism could be attributed to the periodic overflow of contour current controlled by astronomical cycles in deep-water slope environment.The discovery of mixed sequences caused by deep-water contour currents can be of great significance for the Ordovician shale gas exploration at the western margin of Ordos Basin.

Key words: carbonate rock, mixed deposition, contour current, Ordovician, Zhuozishan area, Ordos Basin

CLC Number:

TE121.3

Li Xiangdong, Que Yi, Huan Yaqi, Chen Haiyan. Mixed carbonate-siliciclastic sequences of deep-water contour current overflow origin of Kelimoli Formation in Zhuozishan area,western margin of Ordos Basin[J]. Oil & Gas Geology, 2018, 39(6): 1201-1212.

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Mixed carbonate-siliciclastic sequences of deep-water contour current overflow origin of Kelimoli Formation in Zhuozishan area,western margin of Ordos Basin

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