Carbonate rock microbial construction of the Lower Cambrian Xiaoerblak Formation in Sugaitblak area，Tarim Basin
Song Jinmin1, Luo Ping1, Yang Shisheng1, Zhai Xiufen1, Zhou Gang2, Lu Pengpeng3
1 Research Institute of Petroleum Exploration and Development，PetroChina，Beijing 100083 2 Institute of Sedimentary Geology，Chengdu University of Technology，Chengdu 610059，Sichuan 3 College of Earth Sciences，Chengdu University of Technology，Chengdu 610059，Sichuan
Abstract：There are three kinds of carbonate rock microbial(cyanobacteria)constructions in the Lower Cambrian Xiaoerblak Formation in Sugaitblak area，Tarim Basin，including microbial mounds and laminated constructions at the lower part，microbial reefs in the middle and upper part and stromatolite constructions at the top.The microbial mounds or laminated constructions are characterized by the stromatactoid cavities and laminated texture formed in the subtidal high energy zone.The constructions with a wide and stable occurrence were related with sticky microbial mats.The microbial dendritic or shrub structure and its cohesive action are developed in reefs，formed by microbial growth and sticky microbial mats.They are widely spread in the study area.There are two stages of microbial reefs.At the first stage macroscopic massive buildups are developed during the regression setting，while at the second stage，two stages of point reefs are developed during the transgression setting.The stromatolite constructions are formed during a more broad transgression setting，overlapped on the point microbial reefs，when the hydrodynamic force was stronger.This type of microbial buildups is formed by microbial bonding and characterized by stromatolite and oncolite.They are only developed at the top of Su Ⅱ，Su Ⅲ and Su IV sections.
Song Jinmin,Luo Ping,Yang Shisheng et al. Carbonate rock microbial construction of the Lower Cambrian Xiaoerblak Formation in Sugaitblak area，Tarim Basin[J]. JOPC, 2012, 14(3): 341-354.
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