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地球学报  2003 

祁连造山带及邻区前寒武纪深变质基底的时代和组成

Keywords: 祁连造山带,年代学,Nd同位素,地球化学,前寒武纪基底

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Abstract:

本文对祁连造山带及邻区前寒武纪深变质基底变泥砂质岩石和壳源花岗质岩石的地质、年代学、地球化学和Nd同位素组成进行了研究。主要结论为:①祁连造山带深变质基底主要由变泥砂质岩石和壳源花岗岩组成,主体形成于0.8~1.0Ga(晋宁期);②大多数变泥砂质岩石和壳源花岗岩具有较强的负铕和负钡异常,tDM和εNd(1.0Ga)分别为1.87~2.26Ga和-8.54~-4.06,显示出较高的成熟度;③花岗质岩石为典型的陆—陆碰撞产物,可能与全球新元古代Rodinia超大陆形成事件有关。本文还探讨了祁连造山带及邻区深变质基底的构造归属,认为祁连—柴北缘地体和阿拉善—敦煌地体在晋宁期以前相互分离,分属华北克拉通和扬子地台不同的板块体系。祁连造山带和秦岭造山带至少在晋宁期就有相同或相似的演化历史。

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