Collabortive Research: Fluid Flow Paths in the Costa Rica Accretionary Wedge

[302907] Gieskes该奖项将支持一项关于哥斯达黎加边缘（中美洲海沟的南部延伸）堆积沉积物中流体流动的研究。沿其他增生边缘的流体流动已被证明在控制这些边缘的机械和化学特性方面是极其重要的。哥斯达黎加边缘与其他海沟环境的不同之处在于，在逆冲下的海洋板块上，上层沉积物的输入较少，大陆沉积物的输入较少。相对于其他海沟，洋板块的逆冲下推高，因此它代表了海沟环境的末端成员。该项目的目标是确定流体喷发的地点，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体系外，该项目的数据还将用于该地区未来钻孔的定位。该项目是加州大学圣克鲁兹分校、加州大学圣地亚哥分校和哥伦比亚大学的科学家们的一项合作研究。实地计划将从研究潜水器阿尔文进行。＊＊＊

9302907 Gieskes 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. ***