Collaborative Research: Erosion History and Sediment Provenance of East Antarctica from Multi-method Detrital Geo- and Thermochronology

合作研究：多方法碎屑地质年代学和热年代学研究东南极洲的侵蚀历史和沉积物来源

• 批准号: 0838729
• 负责人: Sidney Hemming
• 金额: $ 7万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-15 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0838729&HistoricalAwards=false
• 关键词: Collaborative; Research; Erosion; History; Sediment

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Much of the inventory of East Antarctic bedrock geochronology, as well as a record of its erosional history, is preserved in Cenozoic sediments around its margin. This project is to use these sediments to understand their sub-ice provenance and the erosional history of the shield by measuring ages of multiple geo- and thermochronometers on single detrital crystals and on multiple crystals in detrital clasts (U/Pb, fission-track, and (U-Th)/He dating of zircon and apatite, and 40Ar/39Ar dating of hornblende, mica, and feldspar). The combination of multi-chronometer ages in single grains and clasts provides a powerful fingerprint of bedrock sources, allowing us to trace provenance in Eocene fluvial sandstones through Quaternary diamicts around the margin. Multiple thermochronometric (cooling) ages in the same grains and clasts also allows us to interpret the timing and rates of erosion from these bedrock sources. Delineating a distribution of bedrock age units, their sediment transport connections, and their erosional histories over the Cenozoic, will in turn allow us to test tectonic models bearing on: (1) the origin of the Gamburtsev Subglacial Mountains, (2) fluvial and topographic evolution, and (3) the history of glacial growth and erosion.

该奖项是根据2009年《美国复苏与再投资法》（公法111-5）资助的。东南极基岩地质学的大部分库存以及其侵蚀史的记录都保存在其边缘周围的新生代沉积物中。 This project is to use these sediments to understand their sub-ice provenance and the erosional history of the shield by measuring ages of multiple geo- and thermochronometers on single detrital crystals and on multiple crystals in detrital clasts (U/Pb, fission-track, and (U-Th)/He dating of zircon and apatite, and 40Ar/39Ar dating of hornblende, mica, and feldspar).单晶粒和碎屑中多基因计年龄的组合提供了基岩来源的强大指纹，使我们能够通过边缘周围的季化二氧化半径在始新世河流砂岩中追踪出处。相同谷物和碎屑中的多个热化学（冷却）年龄也使我们能够解释这些基岩来源的侵蚀的时机和速率。描述基岩年龄单元的分布，其沉积物传输连接以及它们对新生代的侵蚀历史，反过来又使我们能够测试有关：（1）Gamburtsev subglacial Mountains的起源：（2）河流和地形进化，以及（3）（3）（3）（3）Glacial and Erosion和Erosion的历史。