RAPID: CT-imaging of IODP Expedition 341 Plio-Pleistocene Strata from the Gulf of Alaska

综合大洋钻探计划(IODP)341考察队在阿拉斯加湾北部的U1417-U1421遗址发现了3240米的中新世至新近地层，这些地层以跨边缘断面的形式排列，以采集新近纪气候变化剧烈时期山脉提供的沉积物样本。这些岩心提供了海洋和陆地系统独特的高纬度沉积记录，因此预计科学界对样品的需求将非常高。在这些岩心被不可逆转地切割和取样之前，首席调查员请求提供支持，以便在选定的岩心中获得高优先级、高分辨率的非侵入性CT扫描，以优化对这些沉积物的利用，以实现探险的科学目标。这需要在进行主要岩心采样之前迅速采取行动(11月中旬)。2013)，以确保正确采样材料，并且不采样在这些复杂的近冰层沉积物中肉眼看不到的扰动间隔或关键纹层。为了及时完成指导主要抽样工作的工作，首席调查人员提议在俄勒冈州立大学兽医学院(毗邻俄勒冈州立大学核心资料库)和位于加拿大魁北克市的国家科学研究所(INRS-ETE)使用CT扫描仪。船上的参与者Mix(OSU)和St.Onge(U·魁北克·里穆斯基)都可以访问这两个设施，他们是更大的科学团体的代表。智力价值：用CT图像记录相并建立与阿拉斯加现代沉积环境的联系将在纹层尺度上提供沉积学变化的关键约束。了解这些沉积过程的历史是IODP考察队341的中心目标，这是评估科迪勒冰盖动态变化的一部分，冰川、侵蚀、隆起和沉积之间的联系，以及海洋-冰盖-气候相互作用在驱动这些变化中的作用。广泛影响：CT扫描将使整个考察队和未来的采样者受益，但必须在2013年11月主要岩心采样之前完成，因此需要快速支持。这项研究将为更大的探险目标做出贡献，包括来自13个国家的研究人员之间的合作。首席调查人员预计，这些CT扫描将提供一个遗留数据集，供更大的科学界在未来很长一段时间内使用。此外，这些数据提供的非凡可视化将为IODP和地球科学提供公共教育和宣传的机会。这些特殊的数据集将作为IODP出版物存档，并向公众免费提供

Integrated Ocean Drilling Program (IODP) Expedition 341 recovered 3240 m of Miocene-to-recent strata from Sites U1417-U1421 in the northern Gulf of Alaska, arranged in a cross-margin transect to sample sediment supplied from the mountains during a period of dramatic Neogene climate change. These cores provide a unique high-latitude sedimentary record of both marine and terrestrial systems and thus the demand for the samples from the scientific community is expected to be very high. Before these cores are irreversibly cut up and sampled, Principal Investigators request support to acquire non-intrusive CT-scans of high-priority, high-resolution sections in selected cores to optimize utilization of these sediments for achieving the scientific objectives of the expedition. This requires rapid action before the main core sampling occurs (mid-Nov. 2013) to insure that the material is correctly sampled and that disturbed intervals or critical laminae that are not obvious to the eye in these complex ice-proximal sediments are not sampled. To accomplish the work in time to guide the main sampling work, Principal Investigators propose to use CT scanners at the Oregon State University College of Veterinary Medicine (adjacent to the OSU Core Repository) and the at the Institut National de Recherché Scientifique, Centre Eau, Terre et Environnement (INRS-ETE) in Quebec City, Canada. Both facilities are accessible by shipboard participants Mix (OSU)and St. Onge (U. Quebec Rimouski), who are acting as representatives of the larger scientific party.Intellectual Merit:Documenting facies with CT-images and establishing the links to the modern sedimentary environment of Alaska will provide key constraints of sedimentological changes at the scale of laminae. Understanding the history of these sedimentary processes is a central goal of IODP Expedition 341, part of assessing the dynamic changes in the Cordilleran Ice Sheet, and the linkage between glaciation, erosion, uplift, and sedimentation, and the role of ocean-icesheet-climate interaction in driving these changes.Broader Impacts:The CT-scans will benefit the entire expedition party plus future samplers, but must be done prior to the main core sampling in November 2013, thereby necessitating RAPID support. This study will contribute to larger expedition goals, including collaborations among researchers from 13 countries. Principal Investigators expect that these CT-scans will provide a legacy dataset used by the larger scientific community long into the future. In addition, the extraordinary visualizations provided by these data will provide opportunities for public education and outreach for IODP and geosciences. These exceptional datasets will be archived as an IODP Publication and will be freely available to the public