Barbados Accretionary Prism Hydrogeologic Characteristics: Submersible-Based Tests at ODP Sealed Boreholes

巴巴多斯增生棱柱水文地质特征：ODP 密封钻孔的潜水测试

• 批准号: 9415924
• 负责人: Bobb Carson
• 金额: $ 19.39万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9415924&HistoricalAwards=false
• 关键词: Barbados; Accretionary; Prism; Hydrogeologic; Characteristics

Carson 9415924 This program, led by Dr. Bobb Carson of Lehigh University, involves researchers from Indiana University, from Scripps Institution of Oceanography at the University of California, San Diego, and from the French marine research laboratory IFREMER. The study follows Ocean Drilling Program Leg 156, whose primary goal was to assess the hydrogeologic conditions along the decollement (a fluid pathway deeply buried in the sedimentary wedge) of the Barbados accretionary prism. During that drilling program on JOIDES Resolution, sealed boreholes ("CORKs") with temperature and chemical sampling systems were emplaced at two drill sites to isolate the section across the decollement, allowing future study of this horizon along which pore waters are hypothesized to migrate. The present project will carry out hydrogeologic studies and pore water sampling for geochemical study in the summer of 1995, approximately one year after drilling, at one of the two borehole sites; French researchers will conduct similar experiments during the same field program at the second site. The field program will be carried out on the French research submersible Nautile. The research program seeks to determine in situ hydrogeologic characteristics and conditions that will provide realistic parameters to the next generation of fluid flow models for accretionary prisms. The overall objective of this research, as well as that of the ocean drilling leg which emplaced the casings and sampled the sediments, is to understand the nature of the processes by which sediments are transformed in the process of subduction, and how the transport of fluids affects the chemistry of the sediments and the ocean. The Barbados region is one of the best studied accretionary prisms in the world, and it provides a natural laboratory for the investigation of subduction, deformation and lithification of sediments in the context of plate tectonics. Understanding the processes involved in plate subduction is a high priority of the Oce an Drilling Program. ***

卡森9415924该方案由利哈伊大学的Bobb卡森博士领导，参与的研究人员来自印第安纳州大学、圣地亚哥加州大学斯克里普斯海洋学研究所和法国海洋研究实验室IFREMER。 这项研究遵循大洋钻探计划第156航次，其主要目标是评估巴巴多斯增生棱柱体滑脱（深埋在沉积楔中的流体通道）沿着的水文地质条件。 在JOIDES Resolution的钻探计划期间，在两个钻探地点放置了带有温度和化学取样系统的密封钻孔（“软木塞”），以隔离滑脱层的部分，从而允许将来研究假设孔隙沃茨迁移的该层位沿着。 本项目将于1995年夏天，即大约在钻探一年后，在两个钻孔地点之一进行水文地质研究和孔隙水取样，以便进行地球化学研究;法国研究人员将在第二个地点的同一实地方案期间进行类似的实验。 实地方案将在法国研究潜水器Nautile上进行。 该研究计划旨在确定现场水文地质特征和条件，为下一代增生棱柱体的流体流动模型提供现实的参数。 这项研究的总体目标，以及安放套管和对沉积物取样的海洋钻探腿的总体目标，是了解沉积物在俯冲过程中发生变化的过程的性质，以及流体的迁移如何影响沉积物和海洋的化学性质。 巴巴多斯地区是世界上研究得最好的增生棱柱体之一，它为研究板块构造背景下的俯冲、变形和沉积物石化作用提供了天然实验室。 了解板块俯冲的过程是大洋钻探计划的一个高度优先事项。 ***