Thermal Structure of the Cascadia Subduction Zone on the Washington Margin

为了获得准确的估计传导热通量的卡斯卡迪亚增生棱镜，PI计划冗余的方法来获得热和流体通量测量沿着2.5 D的配置文件的边缘在一个单一的纬度。在这一剖面中，他们将使用适用于不可穿透下层的隔热层、连续流体流量计、用于沉积物孔隙水化学和热梯度测量的多芯部署以及Jason-II热流探头。热流和流体通量数据将在沿着2900米至500米深度的10个特定等间距深度间隔处获得。热流剖面在空间上也将与美国国家科学基金会计划在北纬47度的华盛顿走廊进行的其他大规模项目相吻合，包括OBSIP（海底地震仪）重点部署地点、OOI的耐久性阵列系泊、高分辨率EM 302测深勘测以及使用LANGSETH的开放获取三维MCS体积。我们的目标是获得足够质量的数据，地表热梯度的CSZ沉降和火成岩basement的向下投影可以与合理的confidence.The开放数据访问战略开发的MCS社区是地球物理数据的新范式，具有广泛的社会利益，我们计划遵循该模型。计划的热流、流体通量和伴随的地球物理数据将在巡航结束后3个月内以初步形式提供（通过GeoPRISM和华盛顿大学网站）。该项目还将包括华盛顿大学的研究生和本科生，以及来自其他机构的学生在邮轮和设备开发。格雷峡谷地区位于奎诺印第安民族的条约捕鱼区内，PI计划将塔霍拉高中和卡斯卡迪亚社区学院的学生和教师纳入实地项目。

To obtain an accurate estimate of conductive heat flux from the Cascadia accretionary prism, the PIs plan redundant methods to obtain both thermal and fluid flux measurements along a 2.5 D profile of the margin at a single latitude. In this profile they will use thermal blankets suitable for impenetrable sub-stratum, continuous fluid flow meters, multi-core deployments for sediment pore-water chemistry and thermal gradient measurements, and Jason-II heat flow probes. The heat flow and fluid flux data will be obtained at 10 specific equally-spaced depth intervals, along the margin from 2900 m to 500 m depths. The heat flow profile would also coincide spatially with other large-scale NSF programs planned for the Washington corridor at 47°N, including the OBSIP (Ocean Bottom Seismometer) focused deployment site, Endurance Array moorings for OOI, high resolution EM302 bathymetry surveys, and an Open Access 3-D MCS volume using the LANGSETH. The goal would be to obtain data of sufficient quality that downward projection of the surficial thermal gradients to the CSZ décollement and igneous basement can be made with reasonable confidence.The Open Data Access strategy developed by the MCS community is the new paradigm for geophysical data that has wide community interest, and we plan to follow that model. The planned heat flow, fluid flux and companion geophysical data will be made publically available (via GeoPRISM and UW web sites) in preliminary form, within 3 months of the end of the cruise. The project will also incorporate UW graduate and undergraduate students, as well as students from other institutions in the cruises and equipment development. The Grays Canyon area is within the treaty fishing zone of the Quinault Indian Nation, and the PIs plan to include students and teachers from the Tahola High School and Cascadia Community College in the field program.