Relation of Structural Style to Fluid Source, Migration, andVenting along the Oregon Subduction Zone

在岩石圈俯冲过程中，由于海洋沉积物的刮离作用，深海海沟的向陆侧形成了增生棱柱。几个相互关联的因素影响了这些厚沉积物棱柱的演化，包括沉积物组成、物理性质、下冲和脱水速率以及脱落沉积物桩内的流体运移。流体的运移和排出对变形带沉积物的力学行为、流体压力和岩化作用起着重要的作用。先前对俄勒冈州边缘地区的研究已经确定了大量的流体排放和排气区域。本研究的目的是获取侧扫声纳和多通道地震数据，以检查俄勒冈边缘的结构背景和通风口位置。将尝试确定吸积棱镜中流体的来源和输送途径。

Accretionary prisms form along the landward side of deep- sea trenches in response to offscraping of oceanic sediments during lithospheric subduction. Several interrelated factors influence the evolution of these thick sediment prisms, including sediment composition, physical properties, rate of underthrusting and dewatering and fluid migration within the off-scraped sediment pile. Fluid migration and expulsion play an important role in the mechanical behavior, fluid pressure and lithification of sediments in the deformation zone. Previous research along the Oregon margin has identified significant areas of fluid discharge and venting. The purpose of the present study is to acquire side-scan sonar and multichannel seismic data with which to examine the structural setting of the Oregon margin and the vent locations. An attempt will be made to identify both the source and transport pathways of fluids in the accretionary prism.