清江石门地区第四纪冰川沉积与岩溶发育期的探讨

RELATIONSHIP BETWEEN KARST DEVELOPMENT AND QUATERNARY GLACIAL DEPOSITS IN SHIMEN DISTRICT, QINGJIANG RIVER

通过对区内第四纪堆积物的研究,为本区岩溶发育期的划分提供了重要依据。丘顶第四纪冰川堆积物的确定,并结合邻近区域古气候环境演变特征,认为大姑-庐山间冰期是本区岩溶地貌基本格架的形成时期。古水文网与岩性是制约岩溶发育的主要因素。同时认为用地文期和阶地来划分岩溶发育期是不合适的。

The Qingjiang river is one of the main southern tributaries of the Yangtze river's middle reach.The Shimen district is located of the landform of the hills between the western Hubei mountainous area and the plain. The carbonate rocks of Cambrian and Ordovician are distributed widely and the karst is quite developed. The study of Quaternary deposits provides much information for identification of the stages of karst development in the area. Based on the analysis of Quaternary glacial deposits on the top of hills and the palaeoclimate environment of neighbouring areas, it can be concluded that the Dagu-Lushan mterglacial stage was the important period forming the basic configuration of the karst geomorphology, and the palaeohydrological network and the properties of the rocks concerned are the main factors influencing karst development. Obviously, it is unreasonable to identify the stages of karst dt-ve topment only by means of the study of the physiographic epoch and terraces