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地质通报  2002 

南苏鲁造山带根部的物质组成及变质作用

, PP. 609-616

Keywords: 大陆造山带根部超高压变质作用物质组成pT条件南苏鲁地区

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Abstract:

在南苏鲁地区,大陆造山带根部主要由5种不同化学成分的岩石类型组成,分别以石榴石橄榄岩、榴辉岩、片麻岩、石英岩和大理岩为代表。它们的原岩是古老的花岗质侵入岩、表壳岩和基性一超基性侵入岩,并一起经历了超高压变质作用。正变质的花岗质片麻岩是超高压变质带的主要组成部分,构成了花岗质和奥长花岗质岩石组合,不同于典型的TTG岩系。变质火山岩具有双峰式火山岩地球化学特征,很可能形成于大陆裂谷环境。除幔源石榴石橄榄岩以外,其他各种岩石都具有可变的、但均低于正常变质岩的氧同位素值,表明其原岩曾在地壳浅部发生了不同程度的水―岩交换作用,并在整个超高压变质过程中保持其米级尺度的不均匀性。新的温、压计算结果表明,石榴石橄榄岩的形成条件可能是1100―1200℃和6.5―8.0GPa,地热梯度等于或小于5℃/km,即以前认为变质作用不可能达到的“禁区”。

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