湖南省西部桑植地区栖霞期相对海平面变化  

Relative Sea level Change in Chihsian Stage in Sangzhi, Western Hunan Province

作　　者：韦恒叶[1] 遇昊[2] 郭兵[3] 汪建国[2] 

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]中国科学院地质与地球物理研究所油气资源重点实验室,北京100029 [3]中国石油长庆油田分公司第一采油厂,陕西延安716000

出　　处：《东华理工大学学报（自然科学版）》2013年第1期43-49,共7页Journal of East China University of Technology(Natural Science)

基　　金：国家自然科学基金(40839907);东华理工大学博士科研启动基金(DHBK201119);东华理工大学核资源与环境教育部重点实验室开放基金(NRE1213)

摘　　要：在全球范围内,中国南方发育的中二叠统地层最为完整,该台地浅海环境的碳酸盐岩地层对于全球海平面变化曲线的重构尤为重要。湖南省西部桑植地区二叠系栖霞组碳酸盐岩地层中地层旋回发育,是层序地层分析和相对海平面变化分析的理想地层。本文通过地层的旋回性分析,将栖霞组和茅口组下部地层划分出三个三级层序S1、S2和S3。在此基础上,结合岩相和相对水深分析结果,重构出桑植地区栖霞期至茅口早期相对海平面变化曲线。该三级海平面变化旋回叠加四级海平面波动,与全球三级绝对海平面变化旋回有着良好吻合性,说明该区栖霞期相对海平面变化与全球绝对海平面变化有关,主要受晚古生代冰期-间冰期旋回的影响,反映二叠纪冈瓦纳大陆百万年级别的气候变化。The Middle Permian stratigraphy outcroped is the most complete in South China all over the world. This shallow shelf carbonate formation would play an important role in reconstructing global sea level change. In Sangzhi area, western Hunan province, carbonate succession of Chihsia Formation （ Middle Permian） display astonishing cyclicity, which is perfect interval for sequence stratigraphy and relative sea level analysis. According to the cyclestratigraphy analysis, the Chihsia and lower Maokou formations can be sudivided into three third-order sequence S1, S2 and S3, in ascending order. Using lithfacies and water-depth analysis, the relative sea level in Chihsia stage in Sangzhi area is reconstructed from the cyclestratigraphy. This third-order relative sea level cycle is superimposed by higher-order sea level fluctuation, and is coincidenct with the global sea level cycle, suggesting that the relative sea level in Chihsia stage in Sangzhi area related to the global sea level change, which is controlled by the Late Palaeozoic glaciationglacial interval cycles. It may reflect Permian million-order climatical ehange in Gondwana eontinent.

关 键 词：栖霞组 二叠系 海平面变化 地层旋回 刚瓦纳冰川 

分 类 号：P532[天文地球—古生物学与地层学]