Collaborative Research: The Geochemistry of Hydrothermal Sediments, Middle Valley, Juan De Fuca Ridge

在这个项目中，pi将确定从JdF北部中部山谷ODP Leg 139开采的碳酸盐的O、C、Sr和pb同位素组成。他们还将进行全岩心射线照相，以确定井下的结构变化。目的是获得过去和现在热液系统沉积物中过去和现在的热剖面、流体平流和金属来源。他们还希望研究这些沉积物中的硫化矿沉积。pi及其合作者的最终目标是建立热液流体循环和流体与沉积物之间随时间变化的化学交换模型。目前正在计划（与美国地质勘探局的合作者一起）钻探中部山谷沉积物，专门研究硫化物矿化问题。

Baker 9314517 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.