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地质学报  2001 

大别山麻粒岩和TTG片麻岩的Sr,Nd,Pb同位素地球化学

, PP. 379-384

Keywords: 麻粒岩TTG片麻岩大别山锶钕铅同位素地球化学

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Abstract:

北大别4个麻粒岩和4个TTG片麻岩样品的Sr,Nd同位素分析结果表明,样品普遍具有较高的锶同位素比值(^87Sr/^86Sr=0.7066-0.7461),较低的Nd同位素比值(^143Nd/^144Nd=0.5108-0.5124),表现出明显的壳源特征,结合铅同位素的组成来看,北大别麻粒岩及TTG片麻岩的同位素成分相当于-下地壳。岩石的特源为古老的地壳,大约在2-3Ga之间,少数样品的同位素特征可能暗示源区有年轻地壳物质的加入。

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