The Stratigraphic Expression of the Onset of Glaciation in Eocene-Oligocene Successions on the Antarctic Continental Margin

南极大陆边缘始新世-渐新世序列中冰川作用起始的地层表现

• 批准号: 1245283
• 负责人: Sandra Passchier
• 金额: $ 11.89万
• 依托单位: Montclair State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1245283&HistoricalAwards=false
• 关键词: Stratigraphic; Expression; Onset; Glaciation; Eocene

Intellectual Merit: This project will investigate glacial advance and retreat of the East Antarctic Ice Sheet through the Eocene-Oligocene transition, a major episode of ice growth. In Prydz Bay, East Antarctica, a 130-170 m thick Eocene-Oligocene transition interval of glaciomarine sediments was cored in drillholes of the Ocean Drilling Program at Sites 739, 742 and 1166. Correlations between the Prydz Bay drillholes have recently been made through well-log and multichannel seismic interpretations. Recent drilling on the Wilkes Land margin of East Antarctica recovered earliest Oligocene sediments overlying a major regional unconformity in two drillholes. The PI will study the lithostratigraphy and weathering history of cores in the five drillholes, to establish a unique Eocene-Oligocene transition record within Antarctic continental margin sediments of glacial advance and retreat cycles, the onset of physical weathering, and glacio-isostasy and self-gravitation processes with implications for the margin architecture, sediment routing, and off-shore sediment dispersal. Cores from the five drillholes will be re-examined through detailed core description using an updated classification scheme, so that lithofacies can be compared between drillholes. Samples will be collected for detailed laser particle size and bulk major element geochemistry via ICP-AES to determine the degree of chemical alteration of the sediments. Phases of major ice growth will be recognized as marker beds of physically eroded sediment and will be correlated to isotopic records documenting Antarctic ice growth offshore in the Southern Ocean. Broader impacts: This project will benefit a large minority undergraduate student population through the availability of up to two paid laboratory internships, a classroom exercise, and the availability of research equipment supported by this award. The project also allows support and training of a graduate student.

知识分子的优点：该项目将通过始新世 - 寡世过渡（冰层生长的重大事件）调查南极冰盖的冰川进步和撤退。在东南极东部的普林兹湾，冰川瘤沉积物的130-170 m厚的始世 - 寡新世过渡间隔是在739、742和1166的海洋钻井程序的钻孔中。最近在南极洲的威尔克斯土地边缘进行了钻探，回收了最早的渐新世沉积物，覆盖了两个钻孔的主要区域不整合。 PI将研究五个钻孔中岩心岩的岩石地层学和风化历史，以在冰川前进和撤退周期的南极大陆边缘边缘的沉积物中建立独特的始世 - 寡新世过渡记录，物理风化的发作，物理风化，以及与冰川相关和自我渗透过程的沉积式序列化的序列序列化的序列序列，并进行了序列化序列，并进行了序列化的序列，并进行了序列化的序列，并进行了序列化。将使用更新的分类方案通过详细的核心描述来重新检查五个钻孔的核心，以便可以在钻孔之间比较岩相。将通过ICP-AES收集样品，以获取详细的激光粒径和大量主要元素地球化学，以确定沉积物的化学改变程度。重大冰生长的阶段将被认为是物理侵蚀沉积物的标记床，并将与记录南大洋南极冰上生长的同位素记录相关。更广泛的影响：该项目将通过最多两个有偿实验室实习，课堂练习以及该奖项支持的研究设备的可用性来使大量少数族裔本科生群体受益。该项目还允许研究和培训研究生。