Magnetic Studies of Cores from Lakes in Taylor Valley, Antarctica

南极洲泰勒谷湖泊岩心的磁性研究

• 批准号: 0341349
• 负责人: Kenneth Verosub
• 金额: $ 3.5万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0341349&HistoricalAwards=false
• 关键词: Magnetic; Studies; Cores; Lakes; Taylor

This award, provided by the Office of Polar Programs, provides support for a project to conduct magnetic investigations of sediments from ice covered lakes in the McMurdo Dry Valleys in concert with other paleoenvironmental work on the sediment cores. INTELLECTUAL MERITThis award facilitates an extraordinary opportunity to conduct paleomagnetic and environmental studies on a suite of cores from the Dry Valleys. The cores were collected in November 2002 by Dr. Peter Doran and his colleagues as part of the NSF-funded project: "Paleoclimate Inferred from Lake Sediment Cores in Taylor Valley, Antarctica". The magnetic studies will improve the correlation between cores from a given lake, will provide new information about past behavior of the McMurdo-Dry Valley ecosystem, and will contribute to the development of a robust chronology for the cores. The research will significantly augment and enhance planned research on the sedimentology, geochemistry, mineralogy, and biostratigraphy of the cores. Funding under the Small Grants for Exploratory Research (SGER) program is appropriate for this project because practical considerations dictate that sampling of the cores take place at the beginning of August, 2003, and because both research and logistical considerations require that the magnetic sampling be done before other samples are collected.BROADER IMPACTSThe proposed research will contribute to a better understanding of the McMurdo-Dry Valley ecosystem, which is the focus of a Long-Term Ecological Research project. The proposed project will also advance the field of environmental magnetism by demonstrating how magnetic parameters can be used to identify different sources of sediment in a lake core. It will also provide new insights about the behavior of the geomagnetic field at high latitudes, which in turn will lead to development of a master curve of secular variation that can be used for dating Holocene sedimentary sequences in Antarctica. And the project will provide an opportunity for undergraduates to participate in research involving Antarctic materials.

该奖项由极地项目办公室提供，为一个项目提供支持，该项目将对麦克默多干旱山谷冰雪覆盖的湖泊中的沉积物进行磁性调查，并与沉积物岩心的其他古环境工作保持一致。智力功绩这个奖项促进了一个非凡的机会，进行古地磁和环境研究的核心套件从干谷。这些岩芯是彼得·多兰博士和他的同事在2002年11月收集的，作为国家科学基金会资助的项目的一部分：“从南极洲泰勒谷湖泊沉积物岩芯推断古气候”。磁性研究将改善来自给定湖泊的岩芯之间的相关性，将提供有关麦克默多干谷生态系统过去行为的新信息，并将有助于为岩芯制定一个强大的年表。这项研究将大大增加和加强对岩心的沉积学、地球化学、矿物学和生物地层学的计划研究。探索性研究小额赠款（SGER）计划下的资金适用于本项目，因为实际考虑要求在2003年8月初进行岩心取样，因为研究和后勤方面的考虑都要求在收集其他样品之前进行磁性取样。更广泛的影响拟议的研究将有助于更好地了解麦克默多-干谷生态系统，这是一个长期生态研究项目的重点。拟议的项目还将通过演示如何使用磁性参数来识别湖芯中沉积物的不同来源，推进环境磁性领域。它还将提供关于高纬度地区地磁场行为的新见解，这反过来将导致制定一条长期变化的主曲线，可用于测定南极洲全新世沉积序列的年龄。该项目将为本科生提供一个参与南极材料研究的机会。