| 湖南下寒武统层序地层特征与古环境演化变迁 |
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| 引用本文： | 庞维华,丁孝忠,高林志,刘燕学,宗文明,逯永光.湖南下寒武统层序地层特征与古环境演化变迁[J].中国地质,2011,38(3):560-576. |
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| 作者姓名： | 庞维华 丁孝忠 高林志 刘燕学 宗文明 逯永光 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 沈阳地质矿产研究所,辽宁沈阳,110034 |
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| 基金项目： | 中国地质调查局项目“中国地质构造区划与区域地质调查综合集成”(1212010811033)资助 |
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| 摘 要： | 湖南下寒武统发育完整,湘西北和湘中地区主要发育一套从黑色岩系到碳酸盐岩的地层序列,湘南地区相变为一套以杂砂岩和炭质板岩不等厚韵律层为主的地层序列,整体构成一个完整的二级层序,可进一步划分为6个三级层序,对应6个有序的海进-海退沉积旋回,其中三级层序的沉积体系域受沉积古环境的影响由凝缩段(CS)+高位体系域(HST)和海进体系域(TST)+凝缩段(CS)+高位体系域(HST)两种垂向叠加形式组成,下寒武统的层序界面类型主要为Ⅱ型层序界面和淹没不整合型层序界面。在空间上,湘西北和湘中地区为由NW向SE的缓坡环境,随着沉积环境逐渐加深,下寒武统沉积厚度逐渐变薄,至湘南地区沉积厚度增厚,沉积深海相厚层杂砂岩夹板岩,其相序变化系统记录了湖南省早寒武世复杂的被动陆缘古地理环境演化和变迁,其演化和变迁也反映了古环境演化对成矿作用的制约。
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| 关 键 词： | 下寒武统 层序地层 岩石地球化学 古环境演化 |
Characteristics of Sequence Stratigraphy and Plaeoenvironmental Evolution of Lower Cambrian strata in Hunan Province |
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| PANG Wei-hu,DING Xiao-zhong,GAO Lin-zhi,LIU Yan-xue,ZONG Wen-ming,LU Yong-guang.Characteristics of Sequence Stratigraphy and Plaeoenvironmental Evolution of Lower Cambrian strata in Hunan Province[J].Chinese Geology,2011,38(3):560-576. |
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| Authors: | PANG Wei-hu DING Xiao-zhong GAO Lin-zhi LIU Yan-xue ZONG Wen-ming LU Yong-guang |
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| Institution: | PANG Wei-hua1,DING Xiao-zhong1,GAO Lin-zhi1,LIU Yan-xue1,ZONG Wen-ming2,LU Yong-guang1(1.Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,2.Shenyang Institute of Geology and Mineral Resources,Shenyang 110032,Liaoning,China) |
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| Abstract: | Lower Cambrian strata are well developed in Hunan.With the main sedimentary formations of black shale and carbonates in western and central Hunan and a suite of greywacke and carbonaceous slate with different thicknesses of rhythmic layers in southern area,the Lower Cambrian in the study area constitutes a second-order sequence,which can be further divided into six third-order sequences,corresponding to six orderly transgression-regression cycles.Impacted by palaeosedimentary environment,the depositional sy... |
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| Keywords: | Lower Cambrian sequence stratigraphy lithogeochemistry Palaeoenvironment evolution2 |
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