Sedimentology of reefal buildups of the Xiannüdong Formation(Cambrian Series 2),SW China

查看全文 作　　者：Hao [1,2,3]Tang;Stephen [3]Kershaw;Xiu-Cheng [1]Tan;Hong [1]Liu;Fei [1]Li;Cheng [1]Shen;Fei-Fan [1]Lu;Xue-Fei [1,2]Yang

机构地区：[1]Division of Key Laboratory of Carbonate Reservoir of CNPC,Southwest Petroleum University;[2]Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary Mineral,Shandong University of Science and Technology;[3]Department of Life Sciences,Brunel University

出　　处：《Journal of Palaeogeography》索引2019年第8卷第2期,共11页

基　　金：supported by National Natural Science Foundation of China(41602166);National Scientific and Technology Major Project(2016ZX05004002-001);PetroChina Innovation Fund(2018D-5007-0105);Scientific Research Starting Project of SWPU(2017QHZ005);Shandong Provincial Key Laboratory of Depositional Mineralization(DMsMzO1TO35) 摘　　要：The reefs in the Xiannüdong Formation(Cambrian Series 2) are the oldest archaeocyathan–microbial bioconstructions in China,but the details of their microbial structures have not been previously described.However,a new section at Tangjiahe site,northern Sichuan Province,contains very well-preserved microbial fabrics that provide these details,and is described in this study.The Tangjiahe section contains three levels of reefal buildups that were constructed by a consortium of archaeocyaths and calcimicrobes in varying proportions.The lowest(oldest) reefal buildup is a calcimicrobial biostrome,possibly in the form of a wide mound with a low relief(unconfirmed due to outcrop limitation),which was formed by Epiphyton with rare small archaeocyaths,and is sandwiched by flat-pebble conglomerates.The middle reefal buildup is a high-relief calcimicrobial mound,enclosed by oolites,that was built by intergrown Renalcis and Tarthinia.Archaeocyath fossils are uncommon,and were bound into the framework by microbial carbonates.The uppermost(youngest) reefal buildup is a low-relief archaeocyathan mound lacking calcimicrobes but partly having microbially-clotted textures attached on archaeocyaths.Calcimicrobes built or aided archaeocyaths to form the framework of Tangjiahe reefs.The three buildups formed in low-energy lagoons behind ooid shoals,and the environment was nutrient-rich due to terrigenous influx from adjacent lands.Tangjiahe reefs thus resemble most Early Cambrian reefs,in settings consistent with eutrophic,calm environments,and are characterized by the domination or aid of calcimicrobial components in framework construction. 关键词：MICROBIALITES Archaeocyaths REEFS CAMBRIAN SERIES 2 Southwest China

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Sedimentology of reefal buildups of the Xiannüdong Formation(Cambrian Series 2),SW China

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