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地质通报  2002 

内蒙古火成岩Sr―Nd同位素特征及成因

, PP. 817-822

Keywords: 内蒙古,火成岩,高ε_(Nd)(t)低Sri,TDM值,构造背景

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Abstract:

收集了本区不同时期形成的各类火成岩,包括花岗岩、火山岩、岩墙群、堆晶岩、蛇绿岩的Sr-Nd等30组同位素数据,从中可以看到以下两个特征:①研究区从800Ma以来形成的包括蛇绿岩在内的火成岩都有高εNd低Sri的同位素特征,绝大多数Sri集中在0.7045~0.7060之间,εNd(t)集中在1~5之间。②TDM年龄较多集中在800~600Ma,个别为1000Ma。结合该区的地质-地球物理研究成果探讨了这些同位素特征值形成的构造背景。

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