Antarctic Peninsula Exhumation and Landscape Development Investigated by Low-temperature Detrital Thermochronometry

低温碎屑测温法研究南极半岛折返和景观发育

基本信息

批准号：
1246484
负责人：
Gregory Balco
金额：
$ 10.13万
依托单位：
Berkeley Geochronology Center
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-12-01 至 2014-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1246484&HistoricalAwards=false
关键词：
Antarctic Peninsula Exhumation Landscape Development

项目摘要

Intellectual Merit: The PIs propose to use the (U-Th)/He system in apatite to investigate the exhumation history, development of the present topography, and pattern of glacial erosion in the central Antarctic Peninsula. The Antarctic Peninsula has been glaciated since the Eocene and Pleistocene climate cooling is hypothesized to have suppressed, rather than enhanced, glacial erosion. To achieve these goals, the PIs will use a thermochronometric record of when and how the present glacial valley relief formed. A challenge to the proposed research is that, unlike Pleistocene glacial landscapes in temperate areas, the Peninsula is ice-covered and it is not possible to directly sample the bedrock surface. The PIs hope to learn about the timing and process of glacial valley formation through apatite (U-Th)/He and 4He/3He measurements on glacial sediment collected near the grounding lines of major glaciers draining the Peninsula. Learning how the Antarctic Peninsula landscape formed is important to discern how the mechanics of glacial erosion operate on long time scales, and to understand how glaciers mediate the interaction between climate change and orogenic mass balance. This work addresses a fundamental question in Antarctic earth science of how to infer geologic and geomorphic processes active on an ice-covered and inaccessible landscape.Broader impacts: This proposal will bring new researchers into the Antarctic research community. A proposed collaboration with British Antarctic Survey researchers will build an international collaboration. The outcomes of this project have ancillary importance to other fields and addresses fundamental challenges in Antarctic Earth Science.

知识分子的优点：PIS建议使用磷灰石中的（U-Th）/HE系统来研究中央南极半岛中部的挖掘历史，当前地形的发展以及冰川侵蚀的模式。自始新世和更新世的气候冷却以来，南极半岛已被冰川化，以抑制而不是增强的冰川侵蚀。为了实现这些目标，PI将使用热量学记录，以了解当前冰川山谷何时以及如何形成。对拟议的研究的一个挑战是，与温带地区的更新世冰川景观不同，半岛是冰覆盖的，不可能直接采样基岩表面。 PI希望通过磷灰石（u-th）/He和4He/3he/3HE测量在冰川沉积物附近收集的主要冰川的接地线附近收集的冰川沉积物，以了解冰川谷形成的时间和过程。了解南极半岛形成的景观对于辨别冰川侵蚀的力学如何长期尺度运作以及了解冰川如何介导冰川如何介导气候变化与造山机质量平衡之间的相互作用很重要。这项工作探讨了南极地球科学中的一个基本问题，即如何推断在冰覆盖且无法接近的景观上的地质和地貌过程。BROADER的影响：该建议将使新的研究人员将新的研究人员带入南极研究社区。与英国南极调查研究人员的拟议合作将建立国际合作。该项目的结果对其他领域具有辅助性，并解决了南极地球科学中的基本挑战。