| 黔桂地区石炭纪I型层序界面沉积记录及成因分析 |
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| 关键词:sedimentary record Type I boundary surface genetic analysis Carboniferous Guizhou and Guangxi |
| 基金项目:中国石油天然气总公司“九五”攻关项目;“中国南方海相古中生界碳酸盐岩层序地层及油气勘探目标评选研究”(编号95050104) |
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| Genetic Analyses and Sedimentary Records of Carboniferous Type I Sequences in Guizhou and Guangxi |
| This paper describes sedimentary recorrds and genetic analyses of the boundary surfaces of Carboniferous Type I sequences in Guizhou and Guangxi.Studies have revealed that native soils of ferralitic and/or bauxite clays,residual breccia of limestone with freshwater diagenetic facies,dolomitization,paleosol and paleokarst are extensively distributed on boundary surfaces of different Type I sequences.δ 13 C,δ 18 O and 87 Sr/ 86 Sr change obviously across the boundary surfaces.There are also apparent differences beween the fossil assemblages existent at the end of previous HSTs and those existent at the beginning of late TSTs,suggesting that the extinction and rebirth of marine invertebrates probably took place in the periods represented by the gaps of Type I boundary surfaces. The sediments on the boundary surfaces of Type I depositional sequences are of important significance in analyzing the origin and related geological events.It has been demonstrated that sediments on the basal boundary surface of S 1 and the top boundary surface of S 10 were probably associated with the tectonic uplift event,which was accompanied by the falling of global sea level at the beginning of S 1.The sediments on the basement of S 3,S 6,S 9 and S 10 could be attributed primarily to the large scale falling of sea level,material supply and carbonate production. |
| PENG Jun,CHEN Jing-shan,CHEN Hong-de,TIAN Jing-chun,HOU Zhong-jian.2000.Genetic Analyses and Sedimentary Records of Carboniferous Type I Sequences in Guizhou and Guangxi[J].Acta Geoscientica Sinica,21(4):433-439. |
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