黔南地区早二叠世大幅度冰川性海平面下降的沉积学新证据  

Sedimentary Records of Early Permian Major Glacial Sea-Level Falls in Southern Guizhou Province,China

作　　者：严雅娟[1] 颜佳新[1] 武思琴 

机构地区：[1]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074

出　　处：《地球科学（中国地质大学学报）》2015年第2期372-380,共9页Earth Science-Journal of China University of Geosciences

基　　金：国家自然科学基金项目(Nos.41472087;41072078);国家重点基础研究发展计划"973"项目(No.2011CB8088004)

摘　　要：众所周知,石炭纪-二叠纪期间冈瓦纳大陆冰盖的推进和消融在低纬度地区形成了许多高频海平面升降变化和广泛分布的旋回沉积.最新研究表明,石炭纪-二叠纪冰室气候时期的大陆冰盖是由一系列不连续的冰期组成.因此石炭纪-二叠纪期间既存在高频低幅的海平面变化,也发育多次大幅度海平面下降.前者在华南地区已有研究证实,后者仍需要深入研究.描述了贵州龙吟和紫云扁平剖面早二叠世碳酸盐岩地层中古岩溶特征,包括垮塌角砾岩及相关沉积构造,分别对应早二叠世两次冰期导致的显著海平面下降,对深入了解华南地区早二叠世古地理演化具有重要意义.As is well-known,the waxing and waning of the Gondwanan ice sheet contributed to high-frequency glacioeustatic sea level fluctuations and widely distributed cyclothems in the low-latitudes during the Carboniferous-Permian Period.Recent investigations suggest that the Permo-Carboniferous Ice Age is composed of a series of distinct episodes of glaciation and interglaciation.It has been confirmed the glacioeustatic sea-level changes controlled the high frequency and low amplitude sea-level changes in South China during the Carboniferous-Permian Period,but the high amplitude sea level falls still needs further exploration.In this paper we describe the characteristics of paleokarst in the Early Permian in Longyin and Bianping sections at south Guizhou,including solution-collapse breccias and related sedimentary structures,which correlate in time with the two major sea level falls in the Early Permian.This study could facilitate our understanding on the evolution of the Early Permian Palaeogeography of South China.

关 键 词：黔南 早二叠世 砾状灰岩 海平面下降 冰期 沉积学 

分 类 号：P588.245[天文地球—岩石学]