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

该项目的目的是全面研究海洋钻探计划第118阶段在西南印度洋脊亚特兰蒂斯II断裂带钻探的变质岩。钻芯长约500米，辉长岩采收率87%。工作将包括详细的岩石学和二次矿物和矿脉组合的电子显微研究，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，并确定引起不同蚀变阶段的各种变质流体的质量通量。这个项目是第一次尝试描述通过钻探获得的海洋地壳第三层岩石的变质和构造历史。这是一套独一无二的样品。这个项目应该对海洋地壳较深处的性质和演化产生新的认识。该项目补充了其他研究人员在同一岩心上进行的原生矿物组合和整体化学研究。

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.