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地质学报  2006 

新疆东天山彩中花岗岩体锆石SHRIMP年龄及地球化学特征

, PP. 43-52

Keywords: 彩中岩体,锆石SHRIMPU-Pb定年,Nd-Sr同位素,新疆东天山

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Abstract:

对新疆东天山康古尔塔格地区彩霞山一带的彩中岩体黑云母二长花岗岩进行了SHRIMP锆石U-Pb定年、主量和微量元素、Nd-Sr同位素研究。锆石206Pb/238U比值平均加权年龄为316±4(2σ)Ma,表明彩中岩体形成于石炭纪中期,因而修正了前人关于“早二叠世晚期侵入体”的时代划分方案。岩体的主、微量元素研究表明,彩中岩体为铝弱过饱和型钙碱性系列花岗岩,形成于岛弧环境。彩中黑云母二长花岗岩具有高的εNd(t)值(+8.5~+7.4)和低的87Sr/86Sr同位素比值(ISr=0.7034~0.7036),表明其物质来源为亏损的地幔源区。低的Nd模式年龄(TDM=0.38~0.47Ga),暗示其源区物质基本上未受到古老大陆地壳物质的混染。上述特征表明彩中花岗岩与东西准噶尔造山带的花岗岩类有可比性。

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