Collaborative Research: The hydrogeological architecture of basaltic ocean crust: CORK experiments for the initial IODP expedition on the flank of the Juan de Fuca Ridge

Juan de Fuca RidgePI/研究所：迈阿密大学的Keir Becker、太平洋地球科学中心Earl Davis、阿拉斯加大学费尔班克斯分校的Geoff Mcand、蒙特利湾水族馆研究所的Hans Jannasch摘要：Juan de Fuca扩张脊的东侧是对脊侧环境中地壳热液过程研究最好的地点之一。研究人员试图通过在2004年夏季综合海洋钻探计划(IODP)的一次探险期间安装新的地球物理和地球化学监测设备，以及后来对钻孔观测站进行潜水访问以下载数据和恢复流体样本，来解决有关这一水文地质系统的主要问题。为了监测压力和温度，将在两个现有的胡安德富卡钻孔和一个新的IODP钻孔中铺设软木，以便隔离地层内的多个区域。在这些紧密排列的钻孔中获得的数据将约束高度不均匀和破裂的洋壳的三维水文地质结构。在2004年年中安装科克之后，研究人员将在2005年和2007年的访问期间使用潜水平台检索数据和流体样本。在这些潜水作业期间，还将从该地区的其他3个现有软木塞(ODP孔1024C、1025C和857D)下载数据。

Title: The Hydrogeologic Architecture of Basaltic Oceanic Crust: CORK Experiments for the Initial IODP Expedition to the Flank of the Juan de Fuca RidgePI/Institution: Keir Becker, University of Miami-RSMAS; Earl Davis, Pacific Geoscience Center; Geoff Wheat, University of Alaska, Fairbanks; Hans Jannasch, Monterey Bay Aquarium Research InstituteAbstract:The eastern flank of the Juan de Fuca spreading ridge is among the best studied sites for understanding crustal hydrothermal processes in a ridge-flank environment. The researchers seek to resolve primary questions about this hydrogeologic system through the installation of new geophysical and geochemical monitoring equipment during a summer 2004 expedition of the Integrated Ocean Drilling Program (IODP) and through later submersible visits to the borehole observatories to download data and recover fluid samples. To monitor pressure and temperature, CORKs that permit isolation of multiple zones within the formation will be deployed in two existing Juan de Fuca boreholes and a new IODP borehole. The data acquired in these closely-spaced boreholes will constrain the three-dimensional hydrogeologic structure of highly hetereogeneous and fractured oceanic crust. Following the CORK installations in mid-2004, the researchers will use a submersible platform to retrieve data and fluid samples during visits in 2005 and 2007. During these submersible operatins, data will also be downloaded from 3 other existing CORKs in the area (ODP holes 1024C, 1025C, and 857D).