碳酸盐岩相与岩溶地貌发育的初步研究──以贵州三叠系为例

A PRELIMINARY RESEARCH ON CARBONATE FACIES AND KARST GEOMORPHOLOGY DEVELOPMENT──A CASE STUDY OF THE TRIASSIC STRATA OF GUIZHOU

本文以地层发育、相交明显、地貌类型齐全的贵州三叠系为例，从分析岩相和发育在各相带上的岩溶地貌入手，应用岩石薄片鉴定、溶蚀试验和化学成分分析等资料，结合野外考察，对非碳酸盐岩夹层、碳酸盐岩的孔隙度、颗粒含量、比溶蚀度、ＳｉＯ＿２和酸不溶物５个影响岩溶发育的主要岩性因素进行岩相与岩溶发育相关分析，基本上查明了岩溶地貌随相带变化的控制规律。

Examples presented in this paper are taken from the Triassic strata of Guizhou that arewidely distributed with distinctive changes of facies and geomorphology types.Rock facies andkarst geomorphology developed on different facies are analysed.Data on analysis of rock piece,corrosion test,chemical composition of carbonate rocks and field view of karst geomorphology areused.The research on ralationship between carbonate facies and karst landforms has been at-tempted.Five factors influencing karst development,i.e.(1)porosity;(2)grain-content;(3)con-tent of SiO_2 and undissoluble rnaterials by acid;(4)specific solubility of carbonate rock and(5)ra-tio of non-carbonate rock thickness to total one in different facies are investigated by regressionanalysis to seek the relationship between rock facies and karst geomorphology.The change of fivefactors with different facies and the control on karst landforms are ascertained.