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
• 负责人: Kathy Licht
• 金额: $ 19.45万
• 依托单位: Indiana University
• 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: 2010-12-15 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1043572&HistoricalAwards=false
• 关键词: Collaborative; Research; East; Antarctic; outlet

Intellectual Merit: The PIs proposed a provenance study of glacial deposits in the Ross Embayment that will provide a broad scale geochronologic survey of detrital minerals in till to help characterize bedrock beneath the East Antarctic ice sheet and constrain Antarctica?s glacial history. This project capitalizes on previous investments in field sampling. Analytical tools applied to single mineral grains extracted from existing collections of glacial till will generate ?fingerprints? of East Antarctic outlet glaciers and West Antarctic till to refine paleo-ice flow models for the Ross Embayment during the last glacial maximum, older records from ANDRILL cores, and to assess IRD sources in the Southern Ocean. New provenance tracers will include a suite of geochronological methods that together provide greater insights into the orogenic and erosional history the region. This project will include U/Pb of detrital zircons, (U-Th)/He on a subset of the U/Pb dated zircons, as well as Ar-Ar of detrital hornblende, mica and feldspars. Broader impacts: This research will train one M.S. student at IUPUI, a Ph.D. student at Columbia, and several undergraduates at both institutions. Graduate students involved in the project will be involved in mentoring undergraduate researchers. Incorporation of research discoveries will be brought into the classroom by providing concrete examples and exercises at the appropriate level. Licht and Columbia graduate student E. Pierce are developing outreach projects with local secondary school teachers to investigate the provenance of glacial materials in their local areas. The research will have broad applicability to many fields.

学术价值：PI 提出了对罗斯海湾冰川沉积物的起源研究，该研究将对耕地中的碎屑矿物进行广泛的地质年代学调查，以帮助描述东南极冰盖下的基岩特征并限制南极洲的冰川历史。该项目利用了之前在现场采样方面的投资。应用于从现有冰川耕种中提取的单一矿物颗粒的分析工具将产生“指纹”。南极东部出口冰川和南极西部冰碛的研究，以完善末次盛冰期罗斯湾的古冰流模型、ANDRILL 岩心的较旧记录，并评估南大洋的 IRD 来源。新的溯源器将包括一套地质年代学方法，这些方法共同提供对该地区造山和侵蚀历史的更深入了解。该项目将包括碎屑锆石的 U/Pb、U/Pb 定年锆石子集的 (U-Th)/He，以及碎屑角闪石、云母和长石的 Ar-Ar。更广泛的影响：这项研究将培养一名硕士学位。 IUPUI 学生，博士哥伦比亚大学的学生，以及两所院校的几名本科生。参与该项目的研究生将参与指导本科生研究人员。通过提供适当级别的具体示例和练习，将研究发现纳入课堂。 Licht 和哥伦比亚大学研究生 E. Pierce 正在与当地中学教师一起开展外展项目，以调查当地冰川材料的来源。该研究将在许多领域具有广泛的适用性。