Barbados Accretionary Prism: A Seismic, Geothermal, Geochemical Study of Fluid Explusion Features

本研究是对巴巴多斯海脊增生杂岩增生过程及相关现象的早期研究的更新。这项工作最初是美国Lamont-Doherty地质观测站和英国伯明翰大学的科学家们的联合项目，这项扩展工作的主要目标是进一步探索巴巴多斯增生杂岩拖尾附近的流体排出特征、热流和孔隙水地球化学，深海钻探和地热调查显示在该杂岩的下坡处普遍存在。目的是量化通量，并定义流体流动路径的几何形状。拟议的研究将在伯明翰大学科学家已经计划的R/V CONRAD上进行的巡航中进行。当海洋岩石圈俯冲时，位于岩石圈板块顶部的一些沉积物被刮掉，形成增生楔形复合体。楔形增生复合体的变形通常与孔隙流体的排出有关，而孔隙流体排出的地点已被证明是生物群落的所在地。该项目旨在了解各种环境下的孔隙流体化学性质和流体路径，这些环境对东海岸科学家来说很容易接近。

This study is a renewal of an earlier study of accretionary processes and related phenomena on the Barbados Ridge accretionary complex. This work began as a joint program between scientists at Lamont-Doherty Geological Observatory in the U.S. and the University of Birmingham, in the U.K. The principal objective of work under this extension is to further explore fluid expulsion features, heat flow and pore water geochemistry near the tow of the Barbados accretionary complex, which deep ocean drilling and geothermal surveys are shown to be prevalent on the lower slope of the complex. The objective is to quantify the flux from and define the geometry of pathways for fluid flow. The proposed research will be carried out on a cruise that is already planned for University of Birmingham scientists to work on the R/V CONRAD. %%% When oceanic lithosphere is subducted, some of the sediment lying on top of the lithospheric plate is scraped off and forms the accretionary wedge complex. Deformation of the accretionary wedge complex is often associated with the expulsion of pore fluids and sites of pore fluid expulsion have been shown to be locales of biological communities. This project is directed towards understanding the nature of pore fluid chemistry and fluid pathways in a variety of environments on an accretionary wedge complex that is readily accessible to east coast scientists.