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地质学报  2003 

江苏东海榴辉岩向斜长角闪岩转化的研究

, PP. 510-521

Keywords: 东海榴辉岩渗滤交代显微结构成分迁移估算后成合晶

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Abstract:

东海榴辉岩曾被俯冲到上地幔,而后又折返回地表,经历了宽广的温度、压力、应力、流体条件等变化范围,形成了大量矿物反应结构,为研究岩石矿物反应提供了很好的素材。本文选取东海地区一个保留从初始榴辉岩到斜长角闪岩完整退变质序列的榴辉岩体作为研究对象,通过详细的显微结构观察、矿物成分分析、成分空间分析、成分迁移估算,揭示了东海榴辉岩向斜长角闪岩的转化过程。该过程可划分为两个阶段:早期为替代绿辉石的后成合晶形成阶段,通过绿辉石内部端元组分间的反应实现,反应产物之一的Fe^2与金红石结合形成钛铁矿,Ca、Mg被排出到绿辉石体系之外。晚期退变为流体的渗滤交代作用,表现为石榴子石被角闪石部分取代、后成合晶的角闪石化,以及黝帘石、白云母的形成。退变质的最后阶段为石榴子石被绿帘石角闪石赤铁矿完全替代。榴辉岩转化成含帘石的斜长角闪岩。

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