Three-Dimensional Seismic Reflection Investigation of Fluid Flow and Structural Evolution: Northern Barbados Ridge

沿着深海增生楔生长的机理 海沟是板块构造学中的一个基本问题。虽然 存在预测海底形状的模型， 存在于变形构造的几何形状、强度 增生沉积物，或剪切阻力沿沿着基地的 控制俯冲的断裂带。人们普遍认识到 流体在沉积物的堆积中起着至关重要的作用， 加积带的变形、成岩和变质作用， 但对液体通道和脱水时间的研究 开始.流体在控制混凝土强度方面的重要性 岩石和剪切阻力是公认的，但很少有数据存在 来研究这些时空特性。 本项目将进行高分辨率的三- 加积棱柱体三维地震反射测量 在巴巴多斯近海，在最初的刮擦区， 底侵作用和沉积物变形。其目标是 表征结构几何形状，并识别流体 在增生棱柱的前部的通道。的 地震数据将受到一套广泛的其他 地球物理数据，以及以前的海洋 在该地区钻井。该项目的成果将用于 计划在巴巴多斯进行更多钻探

The mechanics of accretionary wedge growth along deep sea trenches is a fundamental problem in plate tectonics. Although models exist which predict seafloor shape, sparse information exists on the geometry of deformation structures, strength of the accreting sediments, or shear resistance along the base of the fault zone which controls underthrusting. It is well recognized that fluids play a crucial role in sediment accretion, deformation, diagenesis, and metamorphism in accretionary zones, but study of fluid pathways and timing of dewatering have just begun. The importance of fluids in controlling the strength of rocks and shear resistance is recognized, but little data exists to investigate these properties spatially or temporally. The present project will conduct a high-resolution three- dimensional seismic reflection survey of the accretionary prism offshore Barbados in the zone of initial off-scraping, underplating and deformation of sediments. The objectives are to characterize the structural geometries, and identify fluid pathways in the frontal part of the accretionary prism. The seismic data will be constrained by an extensive suite of other geophysical data, as well as the results of previous ocean drilling in the region. Results from this project will be used in planning additional drilling in Barbados.