Collaborative Research: East Antarctic outlet glacier contributions to the Ross Sea from chronology of detrital grains

学术价值：PI建议对罗斯湾的冰川沉积进行来源研究，这将提供对TIL中碎屑矿物的广泛地质年代学调查，以帮助确定东南极冰盖下的基岩特征，并约束南极洲-S冰川历史。该项目利用了以前在实地采样方面的投资。将分析工具应用于从现有冰川冰川收集中提取的单矿物颗粒，将产生指纹？南极东部出口冰川和南极西部冰川，直到改进上一次冰川盛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。新的物源示踪将包括一套地质年代学方法，这些方法共同提供了对该地区造山和剥蚀历史的更深入的了解。该项目将包括碎屑锆石的U/Pb，U/Pb测年锆石的子集上的(U-Th)/He，以及碎屑角闪石、云母和长石的Ar-Ar。更广泛的影响：这项研究将培训IUPUI的一名硕士学生，哥伦比亚大学的一名博士生，以及两所大学的几名本科生。参与该项目的研究生将参与指导本科生研究人员。通过提供具体的例子和适当级别的练习，将把研究发现纳入课堂。利赫特和哥伦比亚大学的研究生E·皮尔斯正在与当地中学教师开展外联项目，以调查当地冰川材料的来源。这项研究将在许多领域具有广泛的适用性。

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.