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地球学报  2006 

羌塘中部各拉丹冬二长花岗岩体同位素地质年代学和地球化学研究

DOI: 10.3975/cagsb.2006.03.05

Keywords: 羌塘中部,各拉丹冬,花岗岩,同位素地质年代学,地球化学

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Abstract:

羌塘中部各拉丹冬岩体主要由二长花岗岩组成,其单颗粒锆石U-Pb年龄为40±3Ma,Rb-Sr等时线年龄为47±0.4Ma,斜长石、角闪石、黑云母K-Ar年龄分别为37.1Ma、48Ma和45.8Ma,形成于始新世。岩石富碱高,高钾(K2O>Na2O),属高钾钙碱性系列。微量元素以富集LREE、LILE(Th、U等),相对亏损HFSE为特征,(87Sr/86Sr)i为0.70701~0.70724,εNd(t)为-6.0~-4.1,δ18O值为8.18‰~9.01‰,构造背景为火山弧花岗岩。55Ma以来,印度板块与欧亚板块碰撞,大范围抬升,青藏高原在经历近南北向挤压缩短的过程中,可能在羌塘地体上产生了平行于主压应力方向的张性构造,导致了各拉丹冬花岗岩体侵位。应为青藏高原隆升在北羌塘陆块所表现的构造热事件之一。

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