上扬子西部茅口组灰岩顶部古喀斯特地貌的厘定及地质意义  

Paleo-karst landforms on top of limestone of the Maokou Formation in the west of the Upper Yangtze platform and its geological significance

作　　者：何斌[1] 王雅玫[2] 姜晓玮[1] 

机构地区：[1]中国科学院广州地球化学研究所,广州510640 [2]中国地质大学,武汉430074

出　　处：《中国地质》2004年第1期46-50,共5页Geology in China

基　　金：中国科学院知识创新工程项目(KZCX2-101);中国博士后基金项目(200333420)资助。

摘　　要：上扬子西部滇东、黔西茅口组之上多为峨眉山玄武岩所覆盖,长期以来人们一直认为两者不存在沉积间断和地层剥蚀。作者通过野外实地考察和室内综合研究首次系统地厘定上扬子西部茅口组顶部的古喀斯特地貌,其形态多种多样,包括起伏不平的古剥蚀面、溶蚀洼地、溶斗、峰林、溶丘、洞穴以及洞穴充填物和古剥蚀面上红壤土。古喀斯特地貌在一个地区的地质发展中具有重要的意义,它代表了一次地壳上升运动。本区古喀斯特的系统研究不仅丰富了中国古喀斯特研究的内容,而且对确定云南地区东吴运动的存在和峨眉山地幔柱的活动提供了重要佐证。The Middle Permian Maokou Formation is generally overlain by the Late Permian Emeishan basalts in eastern Yunnan and western Guizhou in the west of the Yangtze platform.It has long been taken for granted that there are no sedimentary breaks or erosion between the Maokou Formation and Emeishan basalts.On the basis of the field investigation and indoor integrated study,the authors present various evidence of the paleo-karst land - forms on top of the Maokou Formation,including rugged ancient erosion surfaces,uvalas,dolines or holes,cone karst,tower karst and caves,as well as cave fillings and red soils on the ancient erosion surfaces,and suggest that paleo-karst landforms have great significance in the geological development in an area,which represent a crustal uplift.The systematic study of the paleo-karst not only enriches the content of the study of paleo-karst in China,but also affirms the existence of the Dongwu movement in Yunnan,and also provides important evidence for the activity of the Emeishan mantle plume.

关 键 词：古喀斯特地貌 峨眉山玄武岩 峨眉山地幔柱 上扬子西部 

分 类 号：P931[天文地球—自然地理学]