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

俄勒冈俯冲带构造样式与流体来源、迁移和喷发的关系

• 批准号: 8813970
• 负责人: J. Casey Moore
• 金额: $ 10.89万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8813970&HistoricalAwards=false
• 关键词: Relation; Structural; Style; Fluid; Source

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.

增生棱柱沿着深海海沟的陆地一侧形成，是岩石圈俯冲过程中海洋沉积物脱落的响应。几个相互关联的因素影响这些厚沉积物棱柱的演化，包括沉积物成分、物理性质、逆冲和脱水速率以及刮除沉积物堆内的流体迁移。流体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具有重要作用。 先前沿着俄勒冈州边缘的研究已经确定了重要的液体排放和通风区域。本研究的目的是获取侧扫声纳和多道地震数据，用于检查俄勒冈州边缘和喷口位置的结构设置。将尝试确定吸积棱镜中流体的来源和传输路径。