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大兴安岭柴河流纹质碎斑熔岩锆石U-Pb定年及成因探讨

DOI: 10.3969/j.issn.1005-3026.2014.03.031, PP. 443-445

Keywords: 流纹质碎斑熔岩,锆石U-Pb年龄,地球化学,大兴安岭,柴河地区

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Abstract:

为了研究大兴安岭柴河地区流纹质碎斑熔岩的形成时代和岩石成因,进行了锆石U-Pb同位素年龄测试和地球化学分析.LA-ICP-MS锆石U-Pb定年结果显示,柴河流纹质碎斑熔岩形成于年龄为135~138Ma的早白垩世。岩石地球化学研究表明,柴河流纹质碎斑熔岩具有高硅富碱、贫钙镁的特征;稀土丰度总量∑REE介于1501×10-6~1915×10-6,轻重稀土分馏明显,m(La)/m(Yb)N=118~1445,Eu负异常(δEu=059~075);微量元素以富集Rb,Ba,K,亏损Nb,P和Ti为特征,与I型花岗岩相似;碎斑熔岩原始岩浆来源于地壳岩石的部分熔融.

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