Alvin Diving on the EPR 9-10 Degrees North: Hydrothermal, Volcanological, and Geochemical Studies in Support of ODP Bare Rock Drilling

海底扩张中心过程的新观点正在出现 综合详细的测深、地球物理和 岩石学数据集岩浆供应的变化沿着 脊轴似乎在控制 地貌、构造、地震和地球化学“分段” 扩散中心这种岩浆分段具有深刻的 对热液过程的影响， 新形成的热渗透特性 地壳。 本项目将支持详细审查 沿着东太平洋海隆南部的热液过程 克利珀顿转换断层这段山脊 使用标准地质和地球物理学方法进行了广泛研究 技术.只有关于喷口流体的化学和性质的数据 本项目所采集到的信息在该山脊段缺乏。 此外，未来的钻探计划将提供一个 火山和热液过程的深度透视。这些 额外的数据将提供第一个完整的三个 脊顶扩展段的尺寸表征。 阿尔文号潜水期间要完成的额外工作 研究包括：结构测绘，玄武岩取样， 评估未来钻探的具体地点。

A new view of sea-floor spreading center processes is emerging from integration of detailed bathymetric, geophysical, and petrological data sets. Variations in the supply of magma along the ridge axis appears to play a fundamental role in controlling morphologic, tectonic, seismic and geochemical "segmentation" of spreading centers. Such magmatic segmentation has profound implications for hydrothermal processes which are controlled by the thermal and permeability characteristics of the newly formed crust. The present project will support a detailed examination of hydrothermal processes along the East Pacific Rise south of the Clipperton Transform Fault. This section of ridge has been extensively studied using standard geologic and geophysical techniques. Only data on the chemistry and nature of vent fluids to be gathered by this project is lacking for this ridge segment. Additionally, future drilling is planned which will provide a depth perspective on volcanic and hydrothermal processes. These additional data will provide the first complete three dimensional characterization of a ridge crest spreading segment. Additional work to be accomplished during Alvin dives in this study includes: structural mapping, basalt sampling, and evaluation of specific sites for future drilling.