Geochemical and Tectonic Studies of Accretionary Magmas and Associated Massive Sulfide Deposits: Galapagos Rift and Juan de Fuca Ridge

本提案是对加拉帕戈斯群岛和轴向海山热液区岩石样本研究的延续。他们希望将新鲜玻璃、热液蚀变熔岩和由挖泥船、阿尔文号和双鱼座四号回收的矿化样品的岩石学和地球化学研究与精细的现场研究结合起来，包括海束、深缆摄影、磁场和电阻率测量。PI将担任项目协调员，将在工作的所有阶段进行合作，并将对样品进行许多地球化学分析。同位素研究将由共同调查人员进行。如果由美国国家海洋和大气管理局资助，PI还将参与到南胡安德富卡的阿尔文潜水活动。人们希望，来自死热液系统（加拉帕戈斯群岛）和一个非常年轻的热液系统（轴向海山）的数据将进一步约束PI开发的模型，即矿床与热液系统有关，这些热液系统是由海底以下2公里深处的小而高度分块的岩浆体的热量驱动的。

This proposal is a continuation of studies of rock samples from the Galapagos and Axial Seamount hydrothermal areas. They wish to integrate petrologic and geochemical studies of fresh glasses, hydrothermally altered lavas and mineralized samples recovered by dredge, ALVIN and Pisces IV with fine scale field studies including Sea Beam, deep-tow photography, magnetic and resistivity measurements. The PI will act as project coordinator, will collaborate on all phases of the work, and will perform many of the geochemical analyses on the samples. Isotopic studies will be carried out by co-investigators. The PI will also participate on an ALVIN dive to the Southern Juan de Fuca if it is funded by NOAA. It is hoped that the data from a dead hydrothermal system (Galapagos) and a very young one (Axial Seamount) will further constrain the models developed by the PI that the ore deposits are associated with hydrothermal systems that are driven by heat from small, highly fractionated magma bodies at depths of 2 km beneath the seafloor.