巢北地区中志留统坟头组沉积相与古环境研究  

RESEARCH ON SEDIMENTARY FACIES AND PALEOENVIRONMENT OF FENTOU FORMATION,MIDDLE SILURIAN IN NORTH CHAOHU AREA

作　　者：李德平[1] 韩宗珠[1] 李安龙[1] 衣伟虹[1] 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100

出　　处：《海洋湖沼通报》2010年第3期126-130,共5页Transactions of Oceanology and Limnology

摘　　要：中志留统坟头组在巢北地区出露广,层位稳定,岩性主要为一套黄绿色中层状石英细砂岩、黄绿色粉砂质泥岩、石英砂岩、杂色薄层粉砂岩、粉砂质泥岩和岩屑砂岩,其中黏土含量较高。本文在2007年7月所测巢湖7410工厂——甘露寺剖面及野外观察的基础上,综合室内手标本观察描述、薄片镜下系统鉴定、粘土矿物差热分析及X射线衍射等工作,探讨中志留统坟头组沉积相和古环境特征。中志留统坟头组形成于温湿的弱碱性环境,经历1次大规模海退和1次不完整海侵过程,主要包含三种沉积相类型,按发育时间顺序为:潮控陆棚相、陆棚相和潮坪相。In the research area,Fentou formation of Middle Silurian exposes widely with horizon steady.Lithologically mainly with yellow-green layered quartz sandstone,yellow-green silty mudstone,quartz sandstone,variegated thin siltstone,silty mudstone and lithic sandstone,including a higher clay content were found.Based on the measured profile Factory No.7410-Ganlusi,integrate indoor description of hand specimens,identifications with microscope,whole-rock chemical analysis,differential thermal analysis and X-ray diffraction,the sedimentary facies and paleoenvironment characteristics of Fentou Formation,Middle Silurian were tried to discuss in this paper.Fentou formation of Middle Silurian formed in a humid and weak alkaline environment,which experiences a large-scale regression and an incompletely transgressive process.The research indicates three types of sedimentary facies,which includes tide-controlled continental shelf facies,continental shelf facies and tidal flat facies chronologically.

关 键 词：巢北地区 中志留统 坟头组 沉积相 古环境 

分 类 号：P512.22[天文地球—地质学] P534.43