Characteristics and genesis of microbial lumps in the Maozhuang Stage(Cambrian Series 2),Shandong Province,China  

作　　者：YANG RenChao FAN AiPing HAN ZuoZhen CHI NaiJie HAN Yu 

机构地区：[1]Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals,College of Geological Science and Engineering,Shandong University of Science and Technology [2]Petroleum Exploration and Production Research Institute,SINOPEC [3]Shandong Province Experimental Institute of Geological Science [4]School of Earth Sciences and Resources,China University of Geosciences

出　　处：《Science China Earth Sciences》2013年第3期494-503,共10页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China(Grant No.40972043);Ministry of Education Key Project of Science and Technology(Grant No.211097);Shandong Province Young and Middle-Aged Scientists Research Awards Fund(Grants Nos.BS2009HZ020,2010BSE06022);Science Project of Universities in Shandong Province(Grants Nos.G08LD01,J09LE04);SDUST Research Fund(Grant No.2010KYTD103)

摘　　要：Microbial lumps have been found in the Maozhuang Stage(Cambrian Series 2) in the Liangcheng section,Shandong Province,China.Their macro-and micro-scale features distinguish them from other carbonate particles such as intraclasts and oncoids.Most lumps have a coarse sand to pebble size.They were mostly rounded during sedimentation or combined to form irregular shapes.A distinct boundary is present between the lumps and the surrounding cement of sparry calcite.The lumps contain either no core at all or several irregular "cores",without a distinct inner texture.They are composed mainly of calcified(micritized) microbes,most likely cyanobacteria.The microbes drilled holes in carbonate grains,after which lumps formed by micritization,cementation,and agglutination by an extracellular polymeric substance(EPS) in a high-energy shallow-marine,subtidal environment.As the lumps are directly related to microbes,they should be considered as microbialites.Microbial lumps have been found in the Maozhuang Stage （Cambrian Series 2） in the Liangcheng section, Shandong Province, China. Their macro- and micro-scale features distinguish them from other carbonate particles such as intraclasts and oncoids. Most lumps have a coarse sand to pebble size. They were mostly rounded during sedimentation or combined to form irregular shapes. A distinct boundary is present between the lumps and the surrounding cement of sparry calcite. The lumps contain either no core at all or several irregular ＂cores＂, without a distinct inner texture, They are composed mainly of calcified （mi- critized） microbes, most likely cyanobacteria. The microbes drilled holes in carbonate grains, after which lumps formed by micritization, cementation, and agglutination by an extracellular polymeric substance （EPS） in a high-energy shallow-marine, subtidal environment. As the lumps are directly related to microbes, they should be considered as microbialites.

关 键 词：CAMBRIAN Maozhuang Stage MICROBE microbial lump CARBONATE 

分 类 号：P618.13[天文地球—矿床学]