An Analysis of Ordovician Rock Association and Sedimentary Environment in Southern Hunan Province

详细信息   

• 责任者：Luo Wei (School of Geoscience ; Yangtze University ; Jingzhou 434023 ; China) ; He Youbin
• 刊名：Geological Bulletin of China
• 出版年：2012
• 卷期：31(7)
• 关键词：沉积岩相 ; lithofacies ; 沉积环境 ; sedimentary environment ; 湖南 ; Hunan Province
• 页码：p.1105-1114
• 图表：4 illus., 2 tables, 37 refs.
• 分类号：0803
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

摘要

The Ordovician strata in the southern Hunan Province consist mainly of sandstone and mudstone （slate）, with minor siliceous rocks and limestone. According to a comprehensive analysis of lithology, 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 was built and the sedimentary evolution was 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.