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地质论评  2012 

雅鲁藏布江缝合带白朗县白岗尖晶石―石榴子石相二辉橄榄岩的相界反应及其意义

Keywords: 蛇绿混杂岩块,尖晶石―石榴子石相界反应,橄榄石中硅镁石出溶物,深俯冲―折返,西藏白岗

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Abstract:

西藏白朗县白岗村蛇绿混杂岩中有一罕见的尖晶石石榴子石二辉橄榄岩小岩块,被松软的蛇纹岩化尖晶石二辉橄榄岩包裹其中。岩块中发育有碎基单斜辉石、斜方辉石中出溶单斜辉石、切过出溶单斜辉石的贯入单斜辉石和外来碎粒单斜辉石及钙质辉石+铬尖晶石钙铁石榴子石相界反应。同时,在岩块和包壳岩石的橄榄石中出现针状硅镁石出溶物。计算这些矿物的温度压力表明,它们的温度压力都处于>800℃,>1?8GPa以上的地幔石榴子石域超高压环境,而且,经历过一个上升俯冲上升的“N”字形历程。

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