华北地台寒武系芙蓉统均一石沉积组构分析  

Sedimentary fabrics analysis of leiolite in the Cambrian Furongian Series, North China Platform

作　　者：殷振轩 左银辉[1] 肖恩照 KHALID Latif YIN Zhenxuan;ZUO Yinhui;XIAO Enzhao;KHALID Latif(College of Energy Resources,Chengdu University of Technology,Chengdu,Sichuan 610059,China;Key Laboratory for Polar Science,MNR,Polar Research Institute of China,Shanghai 200136,China;National Centre of Excellence in Geology,University of Peshawar,Peshawar 25130,Pakistan)

机构地区：[1]成都理工大学能源学院,四川成都610059 [2]自然资源部极地科学重点实验室中国极地研究中心,上海200136 [3]National Centre of Excellence in Geology,University of Peshawar,25130

出　　处：《东北石油大学学报》2022年第3期45-53,65,I0003,I0004,共12页Journal of Northeast Petroleum University

基　　金：科技部国家重点研发计划项目(2021YFB3900105-7);上海市青年科技英才扬帆计划项目(21YF1452100)。

摘　　要：华北地台寒武系芙蓉统长山组发育系列均一石生物丘,选取河北涞源祁家峪剖面与山西大同口泉剖面,由宏观至微观尺度分析两地同期均一石的形态学及碳酸盐岩微相形成机制与微组构特征。结果表明:宏观上,祁家峪和口泉剖面均一石位于寒武系芙蓉统长山组三级层序顶部,发育于浅缓坡相泥晶灰岩,在相对海平面下降阶段存在均一石的统一建造模式;微观上,两个剖面均一石内部微生物化石种类较为相似,主要包括附枝菌(Epiphyton)、葛万菌(Girvanella)及肾形菌(Renalcis),在均一石形成过程中有微生物席及其内部复杂的钙化作用的参与,黄铁矿颗粒的发育指示在微生物席组成上的复杂性。祁家峪和口泉剖面均一石内部微生物化石存在差异,在相似的形成机制中受局部环境等因素的影响,也代表微生物席内部蓝细菌种类的多样性组合。该结果为进一步探讨均一石的形成机制及微生物席内部钙化作用提供研究思路。Leiolitic bioherms are developed in the Cambrian Furongian Series Changshan Formation at North China Platform,Qijiayu Section and Kouquan Section are selected to analyze the morphology,the formation mechanism of carbonate microfacies and microstructure characteristics of the same period leiolites from macro to micro scale.The results indicated leiolites from two sections are both located at the top of the third-order sequence of the Changshan Formation,and developed in the micrite of shallow ramp facies,representing the same formation mechanism of leiolites in the stage of relative sea level decline.Microscopically,the types of microbial fossils in leiolites from two sections are relatively similar,mainly include Epiphyton,Girvanella and Renalcis,which indirectly proves the participation of microbial mats and the internal complex calcification in the formation of leiolites.And the pyrite particles indicate the complexity of microbial mats composition.Special filamentous cyanobacteria fossils contained in the leiolite bioherms of the Changshan Formation in Kouquan Section,showing the influence of local environment and other factors in the similar formation mechanism,and also representing the diversity combination of cyanobacteria in the microbial mat.The results provide a research idea for further exploring the formation mechanism of leiolites and the internal calcification of microbial mats.

关 键 词：华北地台 寒武系 芙蓉统 均一石 微组构特征 祁家峪剖面 口泉剖面 

分 类 号：P618.13[天文地球—矿床学]