Sedimentary characters of carbonate platform marginal slope of the Early Cambrian in northern Sichuan Basin and perspective of deformation structures
Shen Cheng1,2, Tan Xiucheng1,2,3, Li Ling2,3, Shi Kailan2,3, Su Chengpeng2,3 Lian Chengbo2,3, Li Hongwei2,3, Xiao Di2,3
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University,Chengdu 610500,Sichuan 2 Sichuan Province Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,Sichuan 3 The Sedimentary and Accumulation Department of Key Laboratory of Carbonate Reservoirs,PetroChina, Southwest Petroleum University,Chengdu 610500,Sichuan
Abstract In this paper,a case study of the Lower Cambrian Xiannüdong Formation in Tangjiahe,Wangcang County of western Micang Mountain was conducted. On the basis of the observation and analysis with microscope,the bottom of Xiannüdong Formation is composed of six major rock types,such as bioclastic mudstone,silty mudstone,analogous-nodular limestone,rudstone,algal clot limestone and calcareous sandstone with bioclastic,and is characterized by rudstone,analogous-nodular limestone,algal clot limestone,slump deformation structure and slide structure. Further analysis shows that L-M association was mostly deposited in low-energy slope environment. The rudstone,as a part of the L′-R association,deposited by the collapse and slump from the mud mounds in upper slope. The other part,analogous-nodular limestone,deformed from L-M association,was supposed synthetical effects by the collapse and slump from mud mounds,the force of differential compaction and the pressure solution caused by the differences of the components. These effects can be used to break the limestone layer to be rudstone shape,even lead to generate some slightly displacement. As a result,L-M,also be called ribbon rocks,become littery deformation structures. Mb association can be considered a mud mounds environment in upper slope. S-M association was deposited in turbidity environment of upper slope. After establishing the sedimentary model and the four associations of slope,all of the evidences indicate that at least during the Early Cambrian Xiannüdong period,the platform marginal slope was developed in western Micang Mountain.
About author: Shen Cheng,born in 1990,is a master candidate in Southwest Petroleum University. He is mainly engaged in reservoir geology. E-mail: 1287566437@qq.com. About the corresponding author Tan Xiucheng,born in 1970,is a professor and Ph.D. supervisor of Southwest Petroleum University. He is mainly engaged in reservoir sedimentology. E-mail: tanxiucheng70@163.com.
Cite this article:
. Sedimentary characters of carbonate platform marginal slope of the Early Cambrian in northern Sichuan Basin and perspective of deformation structures[J]. JOPC, 2015, 17(3): 321-334.
. Sedimentary characters of carbonate platform marginal slope of the Early Cambrian in northern Sichuan Basin and perspective of deformation structures[J]. JOPC, 2015, 17(3): 321-334.
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