再论广西桂西、桂西北高峰丛热带岩溶发育历史

A RE-DISCUSSION ON THE DEVELOPING HISTORY OF THE HIGH CLUSTER PEAK IN THE WEST AND NORTHWEST GUANGXI

本文借助桂西、桂西北岩溶高峰丛洼地区内一些不同时代堆积物,对该区热带岩溶发育历史作了一些研究,其结论基本与笔者以前的推论相一致。即桂西、桂西北高峰丛洼地热带岩溶可能由侏罗纪就开始,早白垩纪基本奠定了本区岩溶地貌雏形,以后的岩溶发育是在此地貌雏形基础上的继承发育,一直至今。从中、上新世以来由于两个地壳活动期,使该区更为强烈上升,岩溶垂向发育得到了加强,形成了现在广西最年轻的高峰丛洼地地区。

The tropical karst developing history is studied in the light of some deposits formed in different periods in the enclosed karst peak- depressions in the west and northwest Guangxi. The results are similar to the former deductions by the author of this paper. That is to say the development of the tropical karst probably began in the Jurassic Period, the basic or embryonic landform were formed at the beginning of the Cretaceous Period and the later karst development are carried on the basic or embryonic landform till now. This area was keeping uplifting due to intense tectonic activity from the Later Neocene Period, so the karst development get stronger toward the vertical direct and enable the area became the nowadays youngest high peak cluster depression.