湖南石门杨家坪剖面震旦纪岩石类型、沉积微相构成及垂向演化作者：谭苏等来源：《中国科技纵横》2014年第08期 【摘 要】 通过野外详细的剖面实测及室内岩矿鉴定等综合分析，对湖南石门杨家坪剖面震旦系陡山沱组和灯影组的岩石类型进行了系统分析，在此基础上，结合沉积相标志开展了沉积相类型及微相类型构成及特征研究，共识别出4种相类型，进一步细分为15822uu个微相类型，分别为陆棚相（硅质浅水陆棚微相、泥质灰岩浅水陆棚微相、泥质深水陆棚微相、粉砂质深水陆棚微相）、局限台地相（云坪微相、含膏云坪微相、藻云坪微相）、台地边缘相（鲕粒滩微相、砂屑滩微相、磷质砂屑滩微相、滩间微相）和台缘斜坡相（含泥灰岩微相、泥质云岩微相、硅质灰岩微相）。并进一步开展了沉积微相组合特征分析。沉积微相的垂向演化记录了海平面变化过程，剖面震旦纪总体上表现为由深水陆棚逐渐演化为台缘斜坡-台地边缘aloe extract-局限台地的海平面下降旋回，可进一步识别出两期二级海平面水进和水退旋回及8期三级海平面升降旋回。 目击证人 【关键词】 岩石类型饮用水水质标准 沉积微相 海平面变化 震旦纪 通风管道杨家坪剖面
【Abstract】 There is few research on the precise composition of rock types、detailed investigation of the sedimentary microfacies and the response of sea level change of Sinian in Shimen， Hunan. Through detailed field survey and indoor rock mineral determination，the rock typesof Doushantuo and Dengying Formation of Sinian at yangjiaping section in Shimen， Hunan were fine analyzed.On this basis ，combining withsedimentary facies marks to carry out research on the types of sedimentary facies and characteristics of microfacies.Four sedimentary facies and fifty microfacies were identified ，The four sedimentary facies are continental shelf （including Siliceous Shallow shelf、argillaceous limestone Shallow shelf、pelitic deep shelf、Silty deep shelf microfacies）、restricted platform （including dolomite tidal flat、gypseous dolomite tidaland algae dolomite tidal microfacies）、归化城platform margin （including oolitic beach、Sand beach、PhosphorusSand beach、and inter beachmicrofacies）、slope of platform margin （including argillaceous limestone 、pelitic dolomite、siliceous limestone microfacies）. And then the combination characteristic analyzed of sedimentary microfacies. The vertical evolution process of Sedimentary microfacies records of sea lev
el changing .The Section of Sinian shows decreasing cycle from deep shelf gradually evolved into the platform margin slope platform margin restricted platform ，and the section is divided into two 2nd grade sequencesand eight 3rd grade sequences.
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