Sediment and Ocean History of the N.E. Pacific During the Pleistocene: A Pilot Study

这项研究（为期一年的试点项目）的目的是研究东北太平洋岩心的沉积物和同位素地球化学以及古地磁，并为后来的沉积学、微古生物学、1990-1991年在该地区结合JOIDES RESOLUTION业务进行了古海洋学和沉积史的地球化学研究。我们的近期目标是利用现有的岩心和1978年8月在加拿大阿拉斯加湾的游轮上收集的材料，建立一个区域同位素和碳酸盐地层。然而，本研究获得的地球化学信息也将为有关东北太平洋历史的悬而未决的问题提供重要的信息。具体而言，我们将1)研究第四纪碳酸盐补偿深度（CCD）的时空行为；2)确定北太平洋底水（NPBW）是否在冰期形成；3)评价海相和弧后火山活动的历史和范围；4)研究气候变化对大陆源物质的来源、供应和扩散途径的影响。如果北太平洋确实是深水形成的场所，那么它的历史对于理解全球气候变化就变得非常重要。REU补编将使华盛顿大学的一名本科生能够参加这项工作，并在海洋地质的观测和分析方面获得宝贵的经验。在项目负责人的指导下，学生将参与岩心的打开、描述和采样，进行沉积学、地球化学、古/岩石磁学和同位素分析。他将协助进行常规的古地磁测量，并学习将定量分析技术应用于地球化学和古地磁数据。他还将与PI合作，利用现有的地球物理数据对结果进行解释和综合，以了解沉积的时间和区域模式。

The purposes of this research (a one-year pilot program) are to examine the sediment and isotope geochemistry and paleomagnetism of cores from the N.E. Pacific Ocean and to establish a framework for later sedimentological, micropaleontological, and geochemical studies of the paleoceanography and sediment history in conjunction with the JOIDES RESOLUTION operations in the region in 1990-1991. Our immediate goal is to establish a regional isotope and carbonate stratigraphy using existing cores and material to be collected on a Canadian cruise to the Gulf of Alaska in August, 1978. However, the geochemical information obtained in this study will also provide important information on outstanding questions concerning the history of the N.E. Pacific. Specifically, we will 1) examine the temporal and spatial behavior of the carbonate compensation depth (CCD) during the Quaternary; 2) establish whether North Pacific Bottom Water (NPBW) was formed during glacial times; 3) evaluate the history and extent of marine and backarc volcanism; and 4) examine the effects of climatic change on the provenance, supply, and dispersal pathways of continentally-derived material. If, indeed, the North Pacific has been a locus of deep water formation, then its history becomes of major importance in understanding global climatic change. The REU supplement will enable a University of Washington undergraduate to participate in this work and gain valuable experience in both observational and analytical aspects of marine geology. Under the guidance of the PI, the student will participate in core opening, description, and sampling for sedimentology, geochemistry, paleo/rock magnetism, and isotope analysis. He will assist in routine paleomagnetic measurements and learn to apply quantitative analytical techniques to geochemical and paleomagnetic data. He will also work with the PI in the interpretation and synthesis of the results with available geophysical data to understand temporal and areal patterns of sedimentation.