略论广西古岩溶

本文探讨广西古岩溶期序及各期古岩溶发育特征。以构造运动名称命名,将广西古岩溶划分为:郁南—广西、柳江、黔桂、东吴、苏皖、印支等六个古岩溶期。它门的共同特点是:都保留有完好的古剥蚀面;剥蚀面上岩溶现象明显;其上沉积有剥蚀期的典型堆积物,诸如铝土岩(矿)、砾岩或砂砾岩等。其主要不同点是:剥蚀面下古岩溶发育强度和古溶洞层厚度有差异;溶洞充填物不同:剥蚀面的起伏高度相差较大,除印支期古剥蚀面起伏较大具古潜山性质外,其余各期古剥蚀面起伏都较小。古地形多属波状平原性质。

A BRIEF DISCUSSION ON THE PALAEOKARST IN GUANGXI

The palaeokarst in Guangxi is discussed in the paper. Named after tectonisms, the palaeokarst in Guangxi is divided into six epochs: Yunan-Guangxi, Liujiang, Qiangui, Dongwu, Suwan and Indosinian epochs. They possess common characteristics: well-preserved palaeo-erosional surfaces, obvious karst and typical accumulation formation at erosional statges above the palaeo-erosional surfaces such as bauxitic rock, conglomerate or sandy conglomerate. But they are different from one another in the development degree of palaeokarsts and the thickness of soluble strata below erosional surfaces, the cave filling, the relief of erosional surface. Except that the erosional surface of palaeokarst in Indosinian epoch has greater relief and the features of buried hill, the others have a little relief and the features of undulating plains.