Exploring the potential of a new North American Plio-Pleistocene paleoclimate record from the yet unopened drill core from paleo-Lake Idaho

这里提出了一个跨学科的项目，以探索古气候的潜力，一个新的，最近钻探，但尚未打开高品质的湖泊沉积物核心在中纬度北美的一个关键位置。来自科隆大学、海德堡大学和蒂宾根大学的三个研究小组与美国明尼苏达大学的LacCore设施合作，对美国西部一个已灭绝的大裂谷古爱达荷州湖的上新世-更新世记录进行了多指标评价。在ICDP项目HOTSPOT的支持下，这个湖钻岩心成为了蛇河平原火山序列下和上覆火山序列钻探的“奖金”。在贝加尔湖和埃尔吉格特金湖钻探项目之后，古爱达荷州湖沉积物序列实际上是第三个由ICDP资助的湖泊钻探岩心记录，恢复了温暖的上新世时期、上新世-更新世过渡期和北方半球冰川的开始。2.7妈，都是一个序列。这是北美大陆的第一个此类记录。建议由三个研究小组联合开展：（1）对爱达荷州上新世-更新世古湖进行岩心开孔、描述和测井，重建沉积历史;（2）结合磁性地层测量、玄武岩和火山灰绝对定年和轨道调谐技术，建立恢复序列的年龄模式;（3）结合元素地球化学、稳定同位素地球化学、沉积物成分、粒度和花粉分析，建立最有希望的古气候代用指标：（4）开展基于花粉的古气候重建;（5）检验上新世中晚期气候遥相关、纬向大气热湿输送以及大尺度大气环流变化在约1000 km/h左右北方半球冰川形成中的潜在作用等一系列假说。2.7 MA.

An interdisciplinary project is proposed here to explore the paleoclimate potential of a new, recently drilled, but not yet opened high-quality lake sediment core from a key location in mid-latitude North America. Interlinked studies of three groups from the Universities of Cologne, Heidelberg and Tübingen in collaboration with the LacCore facility of the University of Minnesota (USA) are proposed to conduct a multi-proxy evaluation of the Plio-Pleistocene record of an extinct large rift paleo-Lake Idaho, Western USA. Recovered by the ICDP Project HOTSPOT, this lake drill core became a 'bonus' of drilling for under- and overlying volcanic sequences of the Snake River Plain. After the Lake Baikal and Lake Elgygytgyn Drilling Projects, the paleo-Lake Idaho sediment sequence is in fact the third ICDP-funded lake drill core record to have recovered the warm Pliocene period, the Plio-Pleistocene transition and the initiation of the Northern Hemisphere glaciations at ca. 2.7 Ma, all in one sequence. It is the first record of this kind in continental North America. Coordinated effort of three research groups is proposed to (1) conduct core opening, description and logging and reconstruct the depositional history of the Plio-Pleistocene paleo-Lake Idaho; (2) construct the age model for the recovered sequence using a combination of magnetostratigraphic measurements, absolute dating on basalts and tephra and orbital tuning techniques; (3) establish the most promising paleoclimate proxies from the combination of elemental and stable isotope geochemistry, bulk sediment composition, grain size and pollen analyses; (4) develop pollen-based paleoclimate reconstructions; and (5) test series of hypotheses on climate teleconnections, meridional atmospheric transport of heat and moisture during the mid-late Pliocene, and the potential role of large-scale atmospheric circulation changes in initiating Northern Hemisphere glaciations at ca. 2.7 Ma.