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西藏芒康盆地新生代高钾火山岩的主元素和同位素地球化学研究

, PP. 502-511

Keywords: 新生代高钾火山岩,地球化学,芒康盆地,西藏

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Abstract:

元素和Pb-Sr-Nd同位素地球化学示踪结果表明,西藏芒康盆地内拉屋乡组高钾火山岩是在转换压缩引起的陆内俯冲背景下产生的,其可能源区为EMII型富集地幔端元。高场强元素Nb和Ta出现明显的负异常,表明在该火山岩源区内有陆壳物质的加入。稀土元素模拟结果显示岩浆源区成岩过程中有单斜辉石、斜长石和石榴子石的分离结晶。

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