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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.

智力优势：项目小组建议利用磷灰石中的(U-Th)/He体系来研究南极半岛中部的挖掘历史、现代地形的发展和冰川侵蚀模式。自始新世和更新世以来，南极半岛一直被冰川覆盖，假设气候冷却抑制了冰川侵蚀，而不是加强了冰川侵蚀。为了实现这些目标，pi将使用热时学记录，记录当前冰川谷地形何时以及如何形成。这项研究面临的一个挑战是，与温带更新世冰川景观不同，半岛是被冰覆盖的，不可能直接对基岩表面进行采样。PIs希望通过对半岛主要冰川接地线附近收集的冰川沉积物进行磷灰石(U-Th)/He和4He/3He测量，了解冰川谷形成的时间和过程。了解南极半岛景观是如何形成的，对于辨别冰川侵蚀在长时间尺度上是如何运作的机制，以及了解冰川是如何调节气候变化和造山物质平衡之间的相互作用的，都是非常重要的。这项工作解决了南极地球科学中的一个基本问题，即如何推断在冰雪覆盖和难以进入的景观上活跃的地质和地貌过程。更广泛的影响：这项提议将为南极研究界带来新的研究人员。与英国南极调查局研究人员拟议的合作将建立一个国际合作。该项目的成果对其他领域具有辅助意义，并解决了南极地球科学的基本挑战。