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

西南印度洋中脊第三层的变质历史和流体-岩石相互作用

• 批准号: 8906261
• 负责人: David Vanko
• 金额: $ 2.6万
• 依托单位: Georgia State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-01 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8906261&HistoricalAwards=false
• 关键词: Metamorphic; History; Fluid; Rock; Interactions

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.

该项目的目标是全面研究大洋钻探计划第 118 段期间从西南印度洋中脊亚特兰蒂斯 II 断裂带钻探的变辉长岩。 钻芯代表近 500 米的辉长岩，​​回收率达 87%。 工作将包括对次生矿物和矿脉组合进行详细的岩相学和电子显微探针研究、稳定同位素研究和流体包裹体研究。 目标是了解岩石的变质历史，并确定引起不同蚀变阶段的各种类型变质流体的质量通量。 %%% 该项目是首次尝试表征通过钻探获得的洋壳第三层岩石的变质和构造历史。 这是一个独特的示例套件。 该项目应该会对洋壳深层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本体化学工作。