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西藏泽当蛇绿岩壳层火山熔岩的岩石地球化学及成因

, PP. 270-278

Keywords: 蛇绿岩,西藏,泽当,边缘洋盆

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Abstract:

泽当蛇绿岩位于雅鲁藏布江蛇绿岩带东段,对其壳层火山熔岩的研究表明,该熔岩属亚碱性玄武岩,岩石化学上表现为低Si、Mg,高Al、Na的特征;稀土分布型式表现为LREE微富集,HREE平缓,不具有Eu负异常;Nb、Ta、Zr、Hf等高场强元素较为富集,反映出泽当蛇绿岩的形成并未受到俯冲作用的影响。通过对其构造环境的判别,得出泽当蛇绿岩形成于边缘洋盆环境,由于印度板块向北推进,使边缘海盆俯冲消亡,而蛇绿岩被构造侵位到如今的位置上。

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