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地球学报  2001 

青藏高原北缘火山岩中辉石岩包体研究

Keywords: 辉石岩包体,矿物化学,可可西里

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Abstract:

青藏高原北缘可可西里鲸鱼湖、雄鹰台、双泉子火山岩中含有辉石岩包体,其主要矿物组成为单斜辉石和斜方辉石。辉石的化学成分与国内外幔源包体-橄榄岩和辉石岩中的类似,与麻粒岩中的明显不同;辉石温压计计算结果表明,辉石形成的温度为1101~1400℃,压力为30×108~60×108Pa,结合岩浆动力学计算结果,推测岩浆的来源深度大于150km,这与地球物理研究得出本区地下深处存在低速层的结果相吻合。

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