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

综合大洋钻探计划（IODP）第341次考察队从阿拉斯加湾北方的U1417-U1421站点恢复了3240米的中新世至现代地层，这些地层被布置在一个跨边缘样带中，以取样在新近纪剧烈气候变化期间从山脉提供的沉积物。这些岩心提供了海洋和陆地系统独特的高纬度沉积记录，因此预计科学界对这些样品的需求量很大。在对这些岩心进行不可逆切割和取样之前，主要调查人员要求获得支持，对选定岩心的高优先级、高分辨率剖面进行非侵入性CT扫描，以优化这些沉积物的利用，实现考察的科学目标。这就需要在主要岩芯取样（2013年11月中旬）之前迅速采取行动，以确保正确取样材料，并确保不对这些复杂的近冰沉积物中肉眼不明显的扰动间隔或关键纹层取样。为了及时完成工作以指导主要采样工作，主要研究者建议在俄勒冈州州立大学兽医学院（毗邻OSU核心储存库）和加拿大魁北克市的国家科学研究中心（INRS-ETE）使用CT扫描仪。这两个设施都是由船上的参与者混合（OSU）和圣翁奇（U。学术价值：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提供纹层尺度上沉积学变化的关键制约因素。了解这些沉积过程的历史是IODP第341次考察的核心目标，也是评估科迪勒拉冰盖动态变化的一部分，以及冰川作用、侵蚀、隆起和沉积之间的联系，以及海洋-冰川-气候相互作用在驱动这些变化中的作用。更广泛的影响：CT扫描将使整个考察队和未来的采样器受益，但必须在2013年11月的主要岩心采样之前完成，因此需要RAPID支持。这项研究将有助于更大的探险目标，包括来自13个国家的研究人员之间的合作。主要研究人员预计，这些CT扫描将提供更大的科学界在未来很长一段时间内使用的遗留数据集。此外，这些数据提供的非凡的可视化将为IODP和地球科学的公共教育和推广提供机会。这些特殊的数据集将作为IODP出版物存档，并将免费向公众提供

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