Metamorphic History and Fluid-Rock Interactions of Layer 3 of the Southwest Indian Ridge

本项目的目标是全面研究 从亚特兰蒂斯二号断裂带钻出来的变辉长岩 在大洋钻探第118航次期间， 程序. 岩芯代表了近500米的 辉长岩，回收率87%。 工作将包括详细的岩相学 次生矿物和脉的电子探针研究 组合、稳定同位素研究和流体包裹体研究。 目的是了解岩石的变质历史 并确定各种变质作用的质量通量 导致不同阶段蚀变的流体。 %%% 这个项目代表了第一次尝试描述 第三层岩石的变质和构造历史 通过钻探获得的海洋地壳。 这是一 独特的样品套房。 该项目将产生新的 理解的性质和演变的更深的部分， 海洋地壳 该项目补充了有待完成的工作， 原生矿物组合和整体化学 其他调查员。

The objective of this project is to comprehensively study the metagabbroic rocks drilled from the Atlantis II fracture zone on Southwest Indian Ridge during Leg 118 of the Ocean Drilling Program. The drill core represents of nearly 500 meters of gabbro with 87% recovery. Work will include detailed petrography and electron microprobe studies of secondary minerals and vein assemblages, stable isotope studies and fluid inclusion studies. The goal is to understand the metamorphic history of the rocks and to determine the mass fluxes of various types of metamorphic fluids that have given rise to different phases of alteration. %%% This project represents the first attempt to characterize the metamorphic and tectonic history of rocks from layer three of the oceanic crust that have been obtained by drilling. This is a unique sample suite. This project should produce a new understanding of the nature and evolution of the deeper parts of the oceanic crust. This project complements work to be done on primary mineral assemblages and bulk chemistry on the same core by other investigators.