Thermal Structure of the Cascadia Subduction Zone on the Washington Margin

为了从卡斯卡迪亚吸积棱镜获得准确的导热热通量估计，pi计划了冗余方法，以在单一纬度沿边缘的2.5 D剖面获得热和流体通量测量。在该剖面中，他们将使用适用于不可穿透地层的热毯、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沿着2900米至500米深度的边缘，在10个特定的等间距深度区间获得。热流剖面也将与NSF计划在47°N华盛顿走廊的其他大型项目在空间上一致，包括OBSIP（海底地震仪）重点部署地点，OOI的耐力阵列系缆，高分辨率EM302测深测量，以及使用LANGSETH的开放存取3-D MCS体积。目标将是获得足够质量的数据，以便能够以合理的信心向下预测地表热梯度到CSZ的过渡段和火成岩基底。MCS社区开发的开放数据访问策略是地球物理数据的新范例，具有广泛的社区兴趣，我们计划遵循该模型。计划中的热流、流体通量和伴生地球物理数据将在巡航结束后的3个月内以初步形式公开（通过GeoPRISM和西澳大学网站）。该项目还将包括西澳大学的研究生和本科生，以及来自其他机构的学生参与邮轮和设备开发。格雷斯峡谷地区位于奎诺特印第安人民族的条约捕鱼区内，私人警察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.