| 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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| 引用本文：彭军,陈景山,陈洪德,田景春,侯中健.2000.黔桂地区石炭纪I型层序界面沉积记录及成因分析[J].地球学报,21(4):433-439. |
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| 摘要点击次数: 2186 |
| 全文下载次数: 2022 |
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| 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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| 中文摘要:黔桂地区石炭纪 10个层序中的S1、S3、S6、S9、S10 5个Ⅰ型层序底界面和S10 层序顶界面具有特征的沉积记录 ,表现为岩性岩相的突变 ,侵蚀平行不整合和上超不整合发育 ,风化残积硅铝、铁铝和铝土质粘土层、残积角砾岩、淡水成岩相及白云岩化广泛发育 ,生物化石组合的巨大变化和C、O、Sr同位素值的明显差异。这些Ⅰ型界面是由不同的成因事件形成的。研究结果表明 ,S1底界面对应的是构造事件 ,即柳江运动 ;S10 顶界面反映的构造事件是黔桂运动 ;S3、S6、S9、S10 底界面均是由海平面下降事件形成的。 |
| 中文关键词:沉积记录 Ⅰ型界面 成因分析 石炭纪 黔桂地区 |
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| Genetic Analyses and Sedimentary Records of Carboniferous Type I Sequences in Guizhou and Guangxi |
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| Abstract: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. |
| keywords:sedimentary record Type I boundary surface genetic analysis Carboniferous Guizhou and Guangxi |
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