辽东南中生代构造演化及其与金矿形成的关系

    TECTONIC EVOLUTION HISTIRY OF SOUTH-EAST LIAONING PROVINCE IN MESOZOIC ERA AND ITS RELATIONSHIP WITH GOLD DEPOSITS

    • 摘要: 辽东南地区中生代受到三期构造运动的影响且各具特色:①三叠纪的印支运动以形成东西向构造线及较多的"S"型花岗岩为特征;②侏罗纪的早燕山运动以近东西向挤压为主,在辽南地区以形成线理走向为北西西向的推覆构造为特征;③晚侏罗世晚期到早白垩世的晚燕山运动产生大量北东、北北东向断裂,同时发生了强烈的左行走滑。上述三期构造运动对金矿的形成均有一定的影响,三个时期均有一定规模的金矿化作用,金矿化的主要时期是在晚侏罗世晚期到早白垩世。

       

      Abstract: There are mainly three period tectonic movements that affect the south-east Liaoning area in Mesozoic Era, besides they are different:(a).The Indosinian movement in Triassic period is characterized by tectonic lines of Wast-East stretching, and "S" type granite. (b).The early Yarishan movement by the end of late Jurassic peroid is characterized by the overthrusting with the lineations trending NWW-SEE, (c). From the end of late Jurassic to early Cretaceous, the late Yanshan movement producted a lot of sinistral displacement faults trending NE or NNE-ward. The gold deposits mainly formed in the end of late Jurassic to early Cretaceous peroid.

       

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