塔西北下寒武统肖尔布拉克组层序划分及台地沉积演化模式

doi:10.11743/ogg20170116

Abstract

Abstract:

Based on the outcrop observation and thin section identification,the distribution of microbial carbonate is described and sequence stratigraphy framework is established in the Lower Cambrian Xiaoerbulak Formation in the Aksu area,Tarim Basin.Finally the carbonate platform evolution during the deposition period of the Xiaoerblak Formation is summarized and rebuilt.The results show that the Xiaoerblak Formation can be subdivided into two third-order sequences.The lower part,SQ1,corresponds to a set of microbial mats which are middle-inner ramp deposition corresponding to the stage of ramp carbonate platform.The upper part is SQ2,which is a TST,and represents a transition from ramp carbonate platform to slightly rimmed shelf carbonate platform.On the slope the tempestite deposited without microbial carbonate,while on the paleokarst highland,the large-scale transgressive mircobial reef was built through the microbial skeleton growth and correlatively bonding effect.The HST represents the stage of slightly rimmed shelf carbonate platform,where the margin and inner-platform are sharply different.On the platform margin,the EHST is characterized with chambered Epiphyton bioherm,while the LHST features some small-scale transgressive microbial bonding reefs.The inner-platform developed microbial shoal facies during the high stand,and its EHST is absent.The inner-platform LHST is characterized by laminites,spongiostromata stromatolites and stromatolites.Their formation is related to the sticky microbial mats.

Key words: microbialite, sequence, Xiaoerblak Formation, Lower Cambrian, carbonate platform, Tarim Basin

CLC Number:

TE121.3

Bai Ying, Luo Ping, Zhou Chuanmin, Zhai Xiufen, Wang Shi, Yang Zongyu, Wang Shan. Sequence division and platform sedimentary evolution model of the Lower Cambrian Xiaoerbulak Formation in the NW Tarim Basin[J]. Oil & Gas Geology, 2017, 38(1): 152-164.

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Sequence division and platform sedimentary evolution model of the Lower Cambrian Xiaoerbulak Formation in the NW Tarim Basin

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