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

作     者：Hao Tang Stephen Kershaw Xiu-Cheng Tan Hong Liu Fei Li Cheng Shen Fei-Fan Lu Xue-Fei Yang 

作者机构：Division of Key Laboratory of Carbonate Reservoir of CNPCSouthwest Petroleum University Shandong Provincial Key Laboratory of Depositional Mineralization and Sedimentary MineralShandong University of Science and Technology Department of Life SciencesBrunel University 

出 版 物：《Journal of Palaeogeography》 (古地理学报（英文版）)

年 卷 期：2019年第8卷第2期

页      面：170-180页

核心收录：

学科分类：0303[法学-社会学] 0710[理学-生物学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0813[工学-建筑学] 0833[工学-城乡规划学] 

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) 

主　　题：Microbialites Archaeocyaths Reefs Cambrian Series 2 Southwest China 

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 ***,a new section at Tangjiahe site,northern Sichuan Province,contains very well-preserved microbial fabrics that provide these details,and is described in this *** Tangjiahe section contains three levels of reefal buildups that were constructed by a consortium of archaeocyaths and calcimicrobes in varying *** 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 *** middle reefal buildup is a high-relief calcimicrobial mound,enclosed by oolites,that was built by intergrown Renalcis and *** fossils are uncommon,and were bound into the framework by microbial *** uppermost(youngest) reefal buildup is a low-relief archaeocyathan mound lacking calcimicrobes but partly having microbially-clotted textures attached on *** built or aided archaeocyaths to form the framework of Tangjiahe *** three buildups formed in low-energy lagoons behind ooid shoals,and the environment was nutrient-rich due to terrigenous influx from adjacent *** 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.