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地质论评  2012 

西藏普兰超镁铁岩体东部铬尖晶石矿物学特征及其地质意义

Keywords: 西藏普兰,拉昂错,尖晶石,蛇绿岩,超镁铁岩

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Abstract:

尖晶石是地幔橄榄岩中一种非常重要的矿物,虽然含量很低,却可以作为其寄主岩石――地幔橄榄岩――的成因指示剂。普兰岩体东部铬尖晶石分布广泛,几乎在所有岩石类型中都有出现。通过矿物学特征的研究,认为尖晶石可分为两类,一类较自形,颜色较深;另一类多呈不规则状和蠕虫状,颜色较浅。根据其化学特征,又可分为富铬型的尖晶石(Cr#>60)和富铝型的尖晶石(Cr#<60),富铬型尖晶石主要出现在纯橄岩、蛇纹岩和辉石岩中,富铝型尖晶石主要出现在二辉橄榄岩中。其中,方辉橄榄岩中的尖晶石形态、化学成分变化比较大,说明它经历了较为复杂的形成和变化过程。通过对尖晶石矿物学和化学特征的综合研究,认为该区尖晶石具有深海橄榄岩和上部俯冲板片(SSZ)构造环境橄榄岩特征,普兰岩体可能先后经历了MOR和SSZ两种构造环境。

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