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西藏过铝花岗岩锆石群型的成因信息

, PP. 63-71

Keywords: 过铝花岗岩,副矿物,锆石群型,岩石成因,西藏

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Abstract:

锆石是西藏过铝花岗岩最重要的副矿物,为了探讨过铝花岗岩的成因,对西藏过铝花岗岩体中的锆石含量、晶体形态和群型分布特征进行了研究,结果表明,可明显分出5种锆石晶体形态;锆石主要在过铝环境条件下,岩浆结晶温度较低时形成,结晶范围为600~900℃,其中冈底斯带结晶温度高于喜马拉雅带。不同构造-岩浆带锆石群型特征反映的成因信息不同,喜马拉雅带为壳源成因,而冈底斯带除了壳源成因之外,还有幔源成分的加入,反映了青藏高原岩石圈组成和演化的不均一性。

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