地质通报2012，Vol.31Issue(7)：1105-1114,10.
湘南地区奥陶系岩石组合及其沉积环境
An analysis of Ordovician rock association and sedimentary environment in southern Hunan Province
摘要
Abstract
The Ordovician strata in southern Hunan Province consist mainly of sandstone and mudstone (slate), with minor siliceous rocks and limestone. According to the rock components,they can be further divided into two sub-rock association types,i.e., rhythmically alternate sandstone and mudstone type,which is mainly developed in Jueshangou, Qiaotingzi and Tianmashan formations; and mudstone (slate)—siliceous rocks type, which is mainly developed in Yanxi Formation. According to a comprehensive analysis of lithol-ogy, palaeontology and sedimentary structures, it is held that the sedimentary environment should be deep-water slope to basin,where deep-water autochthonous (in situ) deposits and turbidite deposits were developed. On such a basis, the sedimentary model has been built and the sedimentary evolution has been analyzed. The sedimentary evolution indicates that the water became gradually deeper on the whole, and there existed an Ordovician sedimentary cycle of transgression-regression in this section. The first transgression began in Qiaotingzi stage of Early Ordovician, and the regression began in Tianmashan stage of Late Ordovician.关键词
湘南地区/奥陶系/沉积环境/深水沉积Key words
southern Hunan Province/ Ordovician/ sedimentary environment/ deep-water deposit分类
天文与地球科学引用本文复制引用
罗薇,何幼斌,蒋金晶,游国庆..湘南地区奥陶系岩石组合及其沉积环境[J].地质通报,2012,31(7):1105-1114,10.基金项目
中国地质调查局项目《中国构造区划及其在全国地质志中的应用》(编号:121201112011)和《华南早古生代沉积-构造演化史》专题 （编号:121201112011）
