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地质学报  2010 

青藏高原拉萨地体北部的前寒武纪变质作用及构造意义

, PP. 449-456

Keywords: 拉萨地体,念青唐古拉岩群,锆石UPb年龄,前寒武纪变质作用,青藏高原

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Abstract:

青藏高原南部拉萨地体中分布的角闪岩相至麻粒岩相变质岩一直被认为是前寒武纪变质基底,但并没有获得可靠的年代学证据。本文运用原位锆石UPb定年方法,在拉萨地体北部那果地区的变质岩中获得了约720Ma的变质年龄,从而证明拉萨地体北部在新古元代经历了角闪岩相变质作用和近同期的岩浆作用。基于这一成果和在拉萨地体中、南部高级变质岩中陆续获得的中、新生代变质年龄,对拉萨地体变质作用的时、空变化及其成因进行了初步探讨。

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