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OALib Journal期刊
ISSN: 2333-9721
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马里亚纳南部弧内坡橄榄岩的岩石学及地球化学特征:对弧前地幔流体交代作用的指示*
Keywords: 马里亚纳,橄榄岩,俯冲带,交代作用
Abstract:
？马里亚纳俯冲带弧内坡由于俯冲的太平洋板片的侵蚀而出露了相当于弧下地幔成分的橄榄岩,这些橄榄岩是研究岛弧岩浆作用及弧下地幔流体交代作用难得的样品。报道了马里亚纳南部关岛以南的弧内坡橄榄岩的矿物组成、主量元素以及微量元素地球化学特征。这些岩石具有非常难熔的矿物组成:橄榄石具有很高的mg,斜方辉石中的al2o3含量极低,尖晶石具有很高的cr。滑石、蛇纹石和角闪石(透闪石为主,有少量镁角闪石和浅闪石)则指示了流体在中低温度下对橄榄岩的交代作用,并表明流体可能含有较高的sio2、al2o3和na2o。全岩的主量元素中,cao和al2o3的质量百分比含量很低,而mgo的含量较高(干体系下多在43%左右),显示岩石经历了高度熔融。微量元素中,u和sr的含量较高,相对富集,可能是来源较浅的板片流体化学特点的反映。
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