硬柱石榴辉岩岩石学研究进展  

Progress in petrologic study of lawsonite-bearing eclogites

作　　者：杜瑾雪[1] 张立飞[1] 

机构地区：[1]北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京100871

出　　处：《岩石矿物学杂志》2014年第1期174-184,共11页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金资助项目(41121062,41090371,41272069);国家重点基础研究发展计划“973”资助项目(2009CB825007)

摘　　要：硬柱石榴辉岩是洋壳经历冷俯冲形成的典型低温高压变质岩,硬柱石是俯冲带将水带入地幔深处的重要载体,其具有指示俯冲带深部流体作用的重要科学意义。文中总结了近20年来硬柱石及硬柱石榴辉岩岩石学的主要研究进展及问题:①硬柱石榴辉岩的全球分布;②硬柱石榴辉岩的分类及硬柱石的产状;③硬柱石榴辉岩稳定性的实验及相平衡模拟研究;④硬柱石榴辉岩的形成与保存;⑤硬柱石榴辉岩相关的流体行为。以上几点,特别是硬柱石相关的流体行为,一直是俯冲带研究中的热点领域。西南天山榴辉岩和蓝片岩中广泛发育进变质和退变质脉体,对其进行深入研究,将会对洋壳深俯冲过程中的流体行为进行更好的约束。Lawsonite eclogites are typical low-t and high-p metamorphic rocks formed during cold oceanic subduction. Lawsonite is an important carrier that brings water into deep mantle and hence plays a crucial role in fluid behavior of deep subducted slab, thus attracting widespread attention. This paper provides an overview of the progress in petrologic study of lawsonite and lawsonite-bearing eclogites in the past two decades： ① the distribution of lawsonite eclogites worldwide; ② the classification of lawsonite eclogites and modes of occurrence of lawsonite; ③ experimental studies and thermodynamic modelling upon the stability of lawsonite eclogites; ④ the formation and preservation of lawsonite eclogites; ⑤ fluid behavior in lawsonite eclogites. The above aspects, especially the last one, are long hotspots in the study of the subduction zone. Both prograde and retrograde veins commonly occur in blueschists and eclogites from Southwestern Tianshan. Further research on these veins will provide important constraints on fluid behavior during deep oceanic subduction.

关 键 词：硬柱石 榴辉岩 洋壳冷俯冲 流体行为 变质岩石学 

分 类 号：P578.94[天文地球—矿物学] P588.34[天文地球—地质学]