Water in granulites: implications for the nature and evolution of the lower continental crust  

作　　者：YANG Xiaozhi XIA Qunke Etienne DELOULE FAN Qieheng HAO Yantao 

机构地区：[1]CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China [2]CRPG-CNRS, BP20, 54501 VandoeuvreCedex, France [3]Institute of Geology, China Earthquake Administration, Beijing 100029, China

出　　处：《Progress in Natural Science:Materials International》2007年第2期117-130,共14页自然科学进展·国际材料（英文版）

基　　金：Supported by National Natural Science Foundation of China (Grant No. 40473007); the Program for New Century Excellent Talents in University (NCET), the Science and Social Practice Fund for Graduate of CAS and the Innovation Fund for Graduate of University of Science and Technology of China

摘　　要：The lower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulites are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodyramical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some longstanding debates. Combined with the Fourier-transform infrared spectroscopy （FTIR） analysis performed on the mineral assemblages （cpx, opx, plag and grt） in lower crustal granulite xenoliths and terrains （exposed section） from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena （e. g. seismic activities and electrical conductive anomalies）, and influences from these water must be taken into consideration.更低的大陆人外壳是在深地球中的最重要的范围层之一并且是外壳披风相互作用发生的直接地方。 Granulites 是在更低的外壳中的统治岩石并且有批评含意因为深外壳液体的作文，自然和进化的知识是影响许多 geochemical 的重要媒介，更低的外壳的地球物理、地球动力学的特征并且可以也在 granulites 和更低的外壳的形成的 petrogenesis 起一个基本作用。在这篇论文，我们考察涉及深大陆人外壳 granulites 和液体和一些长期的争论的最近的进展。与Fourier变换红外线的光谱学结合了( FTIR 分析从华东在更低的外壳的 granulite 捕虏体和地面(暴露的节)表现在矿物质集合( cpx ， opx ， plag 和 grt )上，结构的水统治了由，这被建议哦在这些，有名无实地无水的阶段可以在深外壳中组成最重要的水水库。这 structual 水可以帮助理解许多降低外壳的地质的过程和现象(例如地震活动和电的传导性的异例) 并且从这些水的影响必须被考虑。

关 键 词：continental lower crust GRANULITES FLUIDS WATER nominally anhydrous minerals. 

分 类 号：P588.34[天文地球—岩石学]