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

从古爱达荷湖尚未打开的钻芯中探索新的北美普里奥-更新世古气候记录的潜力

• 批准号: 338911195
• 负责人: Professor Dr. Erwin Appel
• 金额: --
• 依托单位: Arbeitsgruppe Geophysik
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/338911195?language=en
• 关键词: Exploring; potential; new; North; American

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.

这里提出了一个跨学科项目，以探索新的，最近钻探的新古气候潜力，但尚未从北美中纬度的关键位置开放高质量的湖泊沉积物核心。提议与明尼苏达大学（美国）的Laccore设施合作，对来自科隆大学，海德堡大学和Tübingen的三个小组进行了互联研究，建议对美国西部的大型ripped lake lake lake lake lake lake lake lake lake lake light-pepleistecene进行多种评估。该湖钻芯被ICDP Project Hotspot恢复，成为了蛇河平原的钻探和上覆的火山序列的“奖励”。在贝加尔湖和Elgygytgyn湖钻井项目之后，古湖爱达荷州的沉积物序列实际上是ICDP资助的第三个由ICDP资助的湖钻核心记录，它恢复了温暖的上新世时期，Plio-Ple-Ple-pely-pelies nortion，以及北半球的启动，北半球的冰川开始。 2.7 mA，全部为一个序列。这是连续北美这种此类记录。提出了三个研究小组的协调努力，以（1）进行核心开放，描述和记录并重建Plio-Pleistecene Paleose-Lake Idaho的沉积历史； （2）使用磁性测量值，玄武岩和tephra和轨道调节技术的绝对约会的组合构建恢复序列的年龄模型； （3）通过元素和稳定同位素地球化学，散装沉积物组成，晶粒尺寸和花粉分析的结合来建立最有希望的古气候代理； （4）开发基于花粉的古气候重建； （5）关于气候触发连接的假设，中期上新世期间热量和水分的子午大气传输的测试序列，以及大气循环在启动北半球冰川时的大气循环变化的潜在作用。 2.7 MA。

项目成果

Downward remagnetization of a ∼74-m-thick zone in lake sediments from palaeo-Lake Idaho (NW United States)—Locating the Gauss/Matuyama geomagnetic boundary within a dual-polarity zone

• DOI: 10.1093/gji/ggaa165
• 发表时间: 2020-08
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: Frederik J. Allstädt;E. Appel;W. Rösler;A. Prokopenko;U. Neumann;T. Wenzel;J. Pross

Late Pliocene to early Pleistocene climate dynamics in western North America based on a new pollen record from paleo-Lake Idaho

• DOI: 10.1007/s12549-020-00460-1
• 发表时间: 2021-01
• 期刊: Palaeobiodiversity and Palaeoenvironments
• 影响因子: 1.4
• 作者: Frederik J. Allstädt;A. Koutsodendris;E. Appel;W. Rösler;T. Reichgelt;Stefanie Kaboth‐Bahr;A. Prokopenko;J. Pross

Reconstruction of environmental and climatic change during the late Pliocene and early Pleistocene in northwestern North America based on a new drill core from paleo-Lake Idaho

基于古爱达荷湖新钻芯重建北美​​西北部上新世晚期和更新世早期的环境和气候变化

• DOI: 10.5194/egusphere-egu2020-14645
• 发表时间: 2020
• 作者: Allstädt;Koutsodendris;Rösler;Prokopenko;Reichgelt
• 通讯作者: Reichgelt