Collaborative Research: Pleistocene East Antarctic Ice Sheet History as Recorded in Sediment Provenance and Chronology of High-elevation TAM Moraines

合作研究:沉积物来源和高海拔 TAM 冰碛年代记录的更新世南极东部冰盖历史

基本信息

  • 批准号:
    0944578
  • 负责人:
  • 金额:
    $ 17.79万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2010
  • 资助国家:
    美国
  • 起止时间:
    2010-06-01 至 2013-05-31
  • 项目状态:
    已结题

项目摘要

Intellectual MeritThe proposed work will investigate changes in the compositional variation of glacial tills over time across two concentric sequences of Pleistocene moraines located adjacent to the heads of East Antarctic outlet glaciers in the Transantarctic Mountains (TAM). The chronologic framework for this work will be generated from cosmogenic exposure ages of boulders on prominent morainal ridges. The PIs hypothesize that variations in till composition may indicate a change in ice flow direction or a change in the composition of the original source area, while ages of the moraines provide a long-term terrestrial perspective on ice sheet dynamics. Both results are vital for modeling experiments that aim to reconstruct the East Antarctic Ice Sheet and assess its role in the global climate system and its potential impact on global sea level rise. The variation of till compositions through time also allows for a more accurate interpretation of sediment cores from the Ross Sea and the Southern Ocean. Additionally, till exposures at the head of some East Antarctic outlet glaciers have been shown to contain subglacial material derived from East Antarctic bedrock, providing a window through the ice to view East Antarctica?s inaccessible bedrock. Till samples will be collected from two well-preserved sequences of moraine crests at Mt. Howe (head of Scott Glacier) and Mt. Achernar (between Beardmore and Nimrod Glaciers). Each size fraction in glacial till provides potentially valuable information, and the PIs will measure the petrography of the clast and sand fractions, quantitative X-ray diffraction on the crushed 2mm fraction, elemental abundance of the silt/clay fraction, and U/Pb of detrital zircons in the sand fraction. Data collection will rely on established methods previously used in this region and the PIs will also explore new methods to assess their efficacy. On the same moraines crests sampled for provenance studies, the PIs will sample for cosmogenic surface exposure analyses to provide a chronologic framework at the sites for provenance changes through time. Broader ImpactThe proposed research involves graduate and undergraduate training in a diverse array of laboratory methods. Students and PIs will be make presentations to community and campus groups, as well as conduct interviews with local news outlets. The proposed work also establishes a new, potentially long-term, collaboration between scientists at IUPUI and LDEO and brings a new PI (Kaplan) into the field of Antarctic Earth Sciences.
本研究将研究横跨横跨横贯南极山脉(TAM)的两个同心圆更新世冰碛层序的冰碛物成分随时间的变化。这项工作的年代学框架将由突出的山脊上的巨石的宇宙暴露年龄产生。pi假设,冰碛物成分的变化可能表明冰流方向的变化或原始源区成分的变化,而冰碛物的年龄提供了长期陆地冰盖动力学的视角。这两个结果对于旨在重建南极东部冰盖和评估其在全球气候系统中的作用及其对全球海平面上升的潜在影响的模拟实验至关重要。随着时间的推移,土壤成分的变化也使得对罗斯海和南大洋沉积物岩心的解释更加准确。此外,一些东南极洲出口冰川顶部的暴露物已被证明含有来自东南极洲基岩的冰下物质,这为透过冰层观察东南极洲提供了一个窗口。难以接近的基岩。Till样本将从两个保存完好的冰碛峰顶序列中收集,分别位于Howe山(Scott冰川的头部)和Achernar山(Beardmore和Nimrod冰川之间)。冰碛物中的每一种粒度都提供了潜在的有价值的信息,pi将测量碎屑和砂组分的岩石学,破碎2mm组分的定量x射线衍射,粉砂/粘土组分的元素丰度,以及砂组分中碎屑锆石的U/Pb。数据收集将依赖于以前在该地区使用的既定方法,并且pi还将探索评估其有效性的新方法。在相同的冰碛垄上取样进行物源研究,PIs将取样进行宇宙形成表面暴露分析,以提供一个时间框架,在这些地点进行物源随时间的变化。更广泛的影响拟议的研究涉及研究生和本科生的各种实验室方法的培训。学生和pi将向社区和校园团体进行演讲,并接受当地新闻媒体的采访。拟议的工作还在IUPUI和LDEO的科学家之间建立了一种新的、潜在的长期合作,并为南极地球科学领域带来了一位新的PI (Kaplan)。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Chemical weathering signatures from Mt. Achernar Moraine, Central Transantarctic Mountains I: Subglacial sediments compared with underlying rock
  • DOI:
    10.1016/j.gca.2020.06.005
  • 发表时间:
    2020-08
  • 期刊:
  • 影响因子:
    5
  • 作者:
    J. Graly;K. Licht;N. Bader;D. Bish
  • 通讯作者:
    J. Graly;K. Licht;N. Bader;D. Bish
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Kathy Licht其他文献

Petrographic signature of the gravel fraction from late Quaternary glacigenic sediments in the Ross Sea (Antarctica): Implications for source terranes and Neogene glacial reconstructions
  • DOI:
    10.1016/j.sedgeo.2024.106742
  • 发表时间:
    2024-10-01
  • 期刊:
  • 影响因子:
  • 作者:
    Matteo Perotti;Luca Zurli;Kathy Licht;Gianluca Cornamusini
  • 通讯作者:
    Gianluca Cornamusini

Kathy Licht的其他文献

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{{ truncateString('Kathy Licht', 18)}}的其他基金

NSFGEO-NERC:Collaborative Research: Chemistry and Biology under Low Flow Hydrologic Conditions Beneath the Greenland Ice Sheet Revealed through Naturally Emerging Subglacial Water
NSFGEO-NERC:合作研究:通过自然涌出的冰下水揭示格陵兰冰盖下方低流量水文条件下的化学和生物学
  • 批准号:
    2039854
  • 财政年份:
    2021
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Interdisciplinary Antarctic Earth Science Meeting 2019 plus Deep Field Planning Workshop; October 2019; Julian, CA
2019跨学科南极地球科学会议加深场规划研讨会;
  • 批准号:
    1924060
  • 财政年份:
    2019
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Subglacial Chemical Weathering under East Antarctica
东南极洲冰下化学风化作用
  • 批准号:
    1744879
  • 财政年份:
    2018
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Collaborative Research: East Antarctic Glacial Landscape Evolution (EAGLE): A Study using Combined Thermochronology, Geochronology and Provenance Analysis
合作研究:东南极冰川景观演化(EAGLE):综合热年代学、地质年代学和起源分析的研究
  • 批准号:
    1443342
  • 财政年份:
    2016
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Interdisciplinary Antarctic Science Meeting; Loveland, CO; September 2015
跨学科南极科学会议;
  • 批准号:
    1541814
  • 财政年份:
    2015
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Collaborative Research: Multidisciplinary Analysis of Antarctic Blue Ice Moraine Formation and their Potential as Climate Archives over Multiple Glacial Cycles
合作研究:南极蓝冰碛形成及其作为多个冰川周期气候档案的潜力的多学科分析
  • 批准号:
    1443433
  • 财政年份:
    2015
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Collaborative Research: Deglacial Ice Dynamics in the Weddell Sea Embayment using Sediment Provenance
合作研究:利用沉积物来源研究威德尔海海湾的冰川消融动力学
  • 批准号:
    1342251
  • 财政年份:
    2014
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
TAM Camp Workshop
TAM营工作坊
  • 批准号:
    1214592
  • 财政年份:
    2012
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Collaborative Research: East Antarctic outlet glacier contributions to the Ross Sea from chronology of detrital grains
合作研究:从碎屑颗粒年代学来看东南极出口冰川对罗斯海的贡献
  • 批准号:
    1043572
  • 财政年份:
    2010
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant
Collaborative Research: Integrated Study of East Antarctic Ice Sheet Tills (ISET): Tracers of Ice Flow and Proxies of the Ice-covered continental shield
合作研究:东南极冰盖蒂尔综合研究(ISET):冰流示踪剂和冰覆盖大陆盾的替代物
  • 批准号:
    0440885
  • 财政年份:
    2005
  • 资助金额:
    $ 17.79万
  • 项目类别:
    Standard Grant

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