高压—超高压变质流体的一种重要载体:名义上的无水矿物

An Important Carrier of High-Pressure and Ultrahigh-Pressure Metamorphic Fluids: Nominally Anhydrous Minerals

本文运用显微傅立叶变换红外光谱技术对3个大别山榴辉岩中的石榴子石和绿辉石进行了观察,发现它们都含有结构水,以OH^-的形式赋存。结果表明,这些名义上的无水矿物可能是陆壳俯冲过程中将水携带进地球深部的重要载体;这些矿物中的结构水是变质流体的组成部分之一;即使在超高压阶段,变质系统也并不是“干”的。

Garnets and omphacites from three pieces of eclogites from the Dabie Mt. have been investigated by the Fourier transform infrared spectrometer (FTIR). All these minerals contain structural water which occur as hydroxyl (OH- ). The results demonstrate that nominally anhydrous minerals can bring water into the depth during deep crust subduction; the structural water in such minerals can be the part of metamorphic fluids; even in the ultra-high pressure stage, the metamorphic system is not 'dry'.