从威宁草海的演化分析0.73Ma来贵州威宁地区喀斯特环境的演变

根据草海0.73 Ma.B.P的沉积记录和林树基等的草海研究成果,结合威宁地区喀斯特环境特征,以及贵州喀斯特溶洞及层状地貌、新构造运动等,确定了草海泥炭沼泽发育与喀斯特夷平面、层状溶洞、河流阶地之间的关系,大尺度上恢复喀斯特环境的侵蚀速率。建立了威宁地区岩溶发育期次,即经历了较强—缓慢—强烈—缓慢—强烈的五个发育阶段。认为喀斯特岩溶发育严格受构造控制,并且新构造运动是威宁地区喀斯特侵蚀速率主要控制因素。这一大尺度研究方法,为贵州喀斯特环境变迁的研究提供了新的研究思路。

Analysis of the Evolution of Karst Environment of Weining Region,Guizhou Province,West China: A Proof from the Sediment Evolution of Lake Caohai since about 73 Million Years

According to the sediment records of Lake Caohai which has a history of about 700 thousands of years,in combination with investigations into Lake Caohai by Lin Shuji,as well as karst environmental features of the Weining area,cavities,layered terrains and new neotectonic movement and so on in Guizhou Province,the authors determined,on a large scale,the erosion rates of karst environment.The karst development areas experienced strong-slow-strong-slow-strong developmental patterns in the Weining area.The karst development of the Weining region was strictly controlled by tectonic and new tectonic movements,thus promoting karst erosion rate in Weining.The aim of this paper is to study the karst environment evolution on a large scale in Guizhou,and a new research idea is proposed for research on Guizhou karst environmental changes.