The Geochemistry of Hydrothermal Sediments, Middle Valley Juan de Fuca Ridge

热液沉积物的地球化学，中谷胡安德富卡海岭

• 批准号: 9400751
• 负责人: Catherine Rigsby
• 金额: $ 8.3万
• 依托单位: East Carolina University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-12-01 至 1996-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9400751&HistoricalAwards=false
• 关键词: Geochemistry; Hydrothermal; Sediments; Middle; Valley

Rigsby 9400751 In this project the PIs will determine the O, C, Sr, and Pb-isotopic composition of carbonates recovered from the Middle Valley of the northern JdF at ODP Leg 139. They will also perform whole-core radiography to determine textural variations downhole. The objective is to obtain past and existing thermal profiles, fluid advection, and sources of metals in sediments of past and present hydrothermal system. They also wish to investigate the sulfide ore deposition in these sediments. The PIs' and their collaborators' ultimate goal is to develop models of hydrothermal fluid circulation and chemical exchange between fluids and sediments through time. A second Leg is now being planned (along with USGS collaborators) to drill the Middle Valley sediments to specifically examine the problem of sulfide mineralization.

Rigsby 9400751在该项目中，PI将确定从ODP腿139的北部JDF中部山谷中回收的碳酸盐的O，C，SR和PB同位素组成。它们还将执行全核射线照相，以确定缺乏的文本变量。 。 目的是获得过去和现在的热液系统沉积物中的过去和现有热谱，流体对流以及金属的来源。他们还希望研究这些沉积物中的硫化物矿石沉积。 PIS及其合作者的最终目标是随着时间的流逝，流体和沉积物之间的水热流体循环和化学交换模型。现在（与USGS合作者一起）正在计划第二回合，以钻探中谷沉积物，以专门检查硫化物矿化的问题。