Mineralogical and Geochemical Studies of Hydrothermally Altered Rocks from the MARK Area, Mid-Atlantic Ridge

大西洋中脊马克地区热液蚀变岩的矿物学和地球化学研究

• 批准号: 8917352
• 负责人: Geoffrey Thompson
• 金额: $ 32.46万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-15 至 1992-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917352&HistoricalAwards=false
• 关键词: Mineralogical; Geochemical; Studies; Hydrothermally; Altered

Numerous samples have been colected from the axial valley of the Mid-Atlantic Ridge and Kane Fracture Zone intersection (the MARK area) during previous dredging campaigns and Alvin dives. Drs. Thompson and Gillis plan to conduct laboratory analyses on these and corresponding rocks from Site 504B (East Pscific Rise) and the Troodos ophiolite in and investigate therole of metamorphic asemblages in the foramtion of ore-forming hydrothermal fluids within oceanic crust. Throughout the range of environments represented by this collection of samples, the PIs hope to encounter a wide variety of temperatures, water/rock conditions, textures and rock types. Analytical techniques will include petrographic analysis and major, trace, and isotopic measurement of minerals, bulk models, calculate buldk rock exchanges, and calculate fluid compositions from vein precipitates and fluid inclusions.

在之前的疏浚活动和阿尔文潜水过程中，从大西洋中部山脊和凯恩断裂带交汇处(马克地区)的轴谷采集了大量样品。Thompson博士和Gillis博士计划对504b站点(东太平洋隆起)和Troodos蛇绿岩中的这些岩石和相应的岩石进行实验室分析，并研究洋壳内成矿热液形成过程中变质岩浆的作用。在这个样本收集所代表的环境范围内，PI希望遇到各种各样的温度、水/岩石条件、纹理和岩石类型。分析技术将包括岩相学分析和矿物的主要、痕量和同位素测量，整体模型，计算块状岩石交换，以及从脉状沉淀物和流体包裹体计算流体成分。