The Fluid Flow Path in the Costa Rica Accretionary Wedge

小行星9302813 该奖项将支持通过哥斯达黎加边缘（中美洲海沟的南部延伸）的增生沉积物进行的流体流动研究。沿其他增生边缘的流体流动沿着已被证明是非常重要的控制机械和化学特性的这种边缘。哥斯达黎加陆缘与其他海沟环境的不同之处在于，在俯冲洋板块上的远洋沉积物输入量低，大陆衍生沉积物输入量低。相对于其他海沟，大洋板块的下冲作用较高，因此它代表了海沟环境的端元。该项目的目标是确定流体排放的地点，对流体进行取样并将其与边缘的结构特征联系起来，并确定沿着边缘的热流及其与流体流动的关系。除了检查该边缘的基本流体低系统外，该项目的数据将用于该地区未来钻孔的选址。该项目是位于圣克鲁斯的加州大学、位于圣地亚哥的加州大学和哥伦比亚大学的科学家之间的合作研究。现场项目将由研究潜水器Alvin进行。 ***

9302813 Langseth This award will support a study of fluid flow through accreted sediments of the Costa Rica margin, the southern extension of the Middle America Trench. Fluid flow along other accretionary margins has been shown to be extremely important in controlling mechanical and chemical characteristics of such margins. The Costa Rica margin differs from other trench environments in having a low input of pelagic sediment on the underthrusting ocean plate and a low input of continental derived sediments. Underthrusting of the oceanic plate is high relative to other trenches and it therefore represents an endmember of trench environments. The objectives of the project are to locate sites of fluid venting, to sample the fluids and relate them to structural features of the margin, and to determine the heat-flow along the margin and its relation to fluid flow. In addition to examining the basic fluid low system on this margin, data from this project will be used for siting future drill holes in the region. The project is a cooperative study between scientists at the University of California at Santa Cruz, the University of California at San Diego, and Columbia University. The field program will be undertaken from the research submersible Alvin. ***