塑性变形区的构造演化分析

Tectonic evolution character analysis on the plastic deformed area

位于卡拉库姆盆地查尔朱台阶中南部的巴格德雷区块的上侏罗统基莫利阶普遍发育一套巨厚的膏盐层,在高温高压下该膏盐层极易塑性变形,从而造成该类塑性变形区构造发育史的恢复较为困难。基于此,本文从盆地演化、非塑性变形区构造发育史研究、膏盐层的沉积演化和塑性变形机理等方面探讨塑性变形区的构造演化特征,最终消除了塑性层对下伏地层造成的"古构造"假象,总结出适用于塑性变形区构造演化分析的有效方法和手段。

Bagtiyarlyk block is located on the middle-south of the Chareju zone,a tectonic zone of Karakum Basin.There is a set of salt and gypsum with huge thickness in Kimmeridgian formation of upper Jurassic.The huge salt and gypsum could be deformed easily under high temperature and high pressure.Therefore it is very difficult to recover tectonic history on the plastic deformation area.So this study emphasize on verifying the tectonic characters in plastic deformed area by analyzing basin evolution,tectonic history of un-deformed area,deposition history of salt and gypsum,mechanism of plastic deformation.The final purpose is to eliminate the false response of ancient structure on under-layers caused by the plastic deformed layers.According to the above described,we conclude some methods which may clarify the real tectonic history on the plastic deformed area.