塔里木板块早—中二叠世玄武质岩浆作用的沉积响应

塔里木板块内部发育了大量由早—中二叠世板内岩浆作用所形成的、以玄武岩类为主的基性岩浆岩,包括玄武岩、辉绿岩、玄武安山岩等,残余分布面积约20万km2。而二叠纪时期是塔里木板块演化过程中一个非常重要的转折时期,从早二叠世晚期开始塔里木板块结束了海相沉积,进入了陆相沉积阶段。通过对塔里木板块的岩浆作用特征和石炭纪—二叠纪沉积相的分析,笔者讨论了这一大规模的岩浆作用对板块晚石炭世—二叠纪的沉积作用所起的控制作用,提出了塔里木板块早—中二叠世巨量玄武质岩浆作用的沉积响应过程模式。

Sedimentary response to the Early-Mid Permian basaltic magmatism in the Tarim plate

In the Tarim plate there is a great deal of basic igneous rocks including basalt,diabase and basaltic andesite formed by the Early to Middle Permian intraplate magmatism,and their residuals cover an area of about 200 000 km2.The Permian was a very important transition stage in the evolution of the Tarim plate.In the late Early Permian the Tarim basin ended marine sedimentation and entered the stage of continental sedimentation.On the basis of an analysis of the characteristic of the Early to Middle Permian basaltic magmatism and Carboniferous to Permian sedimentary facies in the Tarim basin,this paper discusses the controls of this large-scale magmatism on the Carboniferous to Permian sedimentation and puts forward a model of the sedimentary response to the Early to Middle Permian basaltic magmatism in the Tarim plate.