论塔里木地台北缘中元古宙兴地运动

在塔里木地台北缘库鲁克塔格断隆上,发现晚元古宙帕尔岗群与其下伏兴地塔格群之间为角度不整合。进一步研究了中元古宙兴地塔格群和晚元古宙帕尔岗塔格群在沉积建造、变质作用、构造样式和岩浆活动等方面的差异,证明中元古宙末期曾发生强烈构造运动——兴地运动。它在1.3～1.4Ga达到高潮,0.95～1Ga时结束,形成塔里木地台基底。根据构造要素的叠加关系和变形特征,将这次构造运动划分为三个变形幕。

MIDDLE PROTEROZOIC XINGDI MOVEMENT IN NORTHERN TARIM PLATFORM

A unconformity interface has been found between the late Pargangtagc formation and underlying Xinyditagc formation at Kulukctagc uprise, in northern Tarim platcform. According to the comparisions of sedimentary formation mctamorphismustruc-tural style and magmatism,between middle protcrozoic Xingditagc formation and late Pro-tcrozic Pargangtagc formation,a strong tectonic movement that took place in later of middle Protcrozic has been proved. The lsotopic age data showed that the Xingdi movement activity is from 1. 3-1. 4Ga to 0. 95-1Ga. It is the Xingdi movement that made middle Protcrozic gcosynclinc fold and inverse, and formed the whole basement of the Tarim platform.According to the supcrosition of structure clement and deformation style, the Xingdi movement can be divided into three tectonic phase.