Comprehensive Study of the Mid-Cenozoic Liverpool, Australia, Reversal: Construction of a Highly Detailed, Full-Vector Paleomagnetic Record From Southern Hemisphere Lavas
澳大利亚中新生代利物浦逆转的综合研究:从南半球熔岩构建高度详细的全矢量古磁记录
基本信息
- 批准号:1015360
- 负责人:
- 金额:$ 26.94万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2010
- 资助国家:美国
- 起止时间:2010-07-01 至 2015-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
It is well-established that Earth's magnetic field arises from motion within its electrically conducting liquid outer core by way of a dynamo process; however, a complete understanding of field generation remains enigmatic. In particular, the problem of polarity reversal remains elusive. Observation of field behavior (variations in direction and intensity) during reversals comes from laboratory analysis of the magnetic information "fossilized" in rocks at the time of their formation. The bulk of our knowledge about the structure of reversing fields has come from drilled core samples at locations in the Northern Hemisphere. Hence, a complete understanding of transitional field behavior on a global scale, and the dynamo process responsible, requires considerably more input from the Southern Hemisphere. Such is the focus of our study of an extensive sequence of Tertiary lavas from the Liverpool Volcano in eastern Australia, which is known to contain the record of an ancient field reversal at about 40 million years ago. Our goal is to obtain the most complete paleomagnetic documentation of polarity reversal recorded in the Southern Hemisphere, both with regard to the progression of directional swings, as well as the changes in field strength. In addition, we are using isotopic dating techniques to date the lavas in order to determine the precise age and duration of the reversal. Results from the project will be used to develop improved global models of dynamo reversal and to supply needed constraints for sophisticated computer simulation. Studies of the geomagnetic field are important because it shields the Earth from harmful cosmic rays and provides the means for human and animal navigation. The field is decaying in strength at a rate that, if it were to continue, would vanish in less than 2000 years. If this occurred, it could signal the onset of an attempt by the dynamo to reverse polarity. Through our study of the Liverpool Australia Reversal we hope to better understand the nature of transitional magnetic field behavior, which has important implications for our understanding of the processes in the deep Earth's interior that give rise to the geomagnetic field. In addition to the scientific goals of the project, the research is supporting the training of undergraduate students at California State Polytechnic University, and is contributing to research infrastructure at the University of Wisconsin.
众所周知,地球的磁场是通过发电机过程从其导电液体外核的运动中产生的;然而,对磁场产生的完整理解仍然是个谜。 特别是,极性逆转的问题仍然难以捉摸。 对反转期间磁场行为(方向和强度的变化)的观察来自于对岩石形成时“磁化”的磁性信息的实验室分析。 我们对反转磁场结构的大部分认识来自于在北方钻探的岩心样品。 因此,要完全了解全球尺度上的过渡场行为,以及负责的发电机过程,需要南半球提供更多的信息。 这就是我们对澳大利亚东部利物浦火山的第三纪熔岩序列进行研究的重点,已知该熔岩序列包含大约4000万年前的古代磁场反转记录。我们的目标是获得南半球记录的最完整的古地磁极性反转文件,包括方向摆动的进展以及场强的变化。 此外,我们正在使用同位素测年技术来确定熔岩的年代,以确定逆转的确切年龄和持续时间。 该项目的成果将用于开发发电机反转的改进全球模型,并为复杂的计算机模拟提供所需的约束条件。对地磁场的研究很重要,因为它保护地球免受有害的宇宙射线的伤害,并为人类和动物提供导航手段。 磁场强度正在以这样的速度衰减,如果继续下去,将在不到2000年的时间内消失。 如果发生这种情况,它可能表明发电机开始尝试反转极性。 通过我们对澳大利亚利物浦地震的研究,我们希望能更好地理解过渡磁场行为的性质,这对我们理解地球深部内部产生地磁场的过程具有重要意义。除了该项目的科学目标外,该研究还支持加州州立理工大学本科生的培训,并为威斯康星州大学的研究基础设施做出贡献。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Kenneth Hoffman其他文献
Minimal Boundaries for Analytic Polyhedra
- DOI:
10.1007/bf02854580 - 发表时间:
1960-05-01 - 期刊:
- 影响因子:0.900
- 作者:
Kenneth Hoffman - 通讯作者:
Kenneth Hoffman
Kenneth Hoffman的其他文献
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{{ truncateString('Kenneth Hoffman', 18)}}的其他基金
RUI: Paleomagnetic Study of Transitional Fields Recorded Throughout the Cenozoic by Australasian Lavas
RUI:澳大利亚熔岩在整个新生代记录的过渡场的古地磁研究
- 批准号:
0715181 - 财政年份:2006
- 资助金额:
$ 26.94万 - 项目类别:
Standard Grant
RUI: Paleomagnetic Study of Transitional Fields Recorded Throughout the Cenozoic by Australasian Lavas
RUI:澳大利亚熔岩在整个新生代记录的过渡场的古地磁研究
- 批准号:
0230347 - 财政年份:2002
- 资助金额:
$ 26.94万 - 项目类别:
Standard Grant
RUI: Paleomagnetic Phase of a Collaborative Study to Spatially and Temporally Delineate the Matuyama-Brunhes Polarity Reversal as Recorded in Tahitian Lava Flows
RUI:在空间和时间上描绘大溪地熔岩流记录的 Matuyama-Brunhes 极性反转合作研究的古地磁相
- 批准号:
9805065 - 财政年份:1998
- 资助金额:
$ 26.94万 - 项目类别:
Standard Grant
RUI: Paleomagnetic Study of the Matuyama-Brunhes Reversal from Dated Lava Sequences on Tahiti, French Polynesia
RUI:根据法属波利尼西亚塔希提岛已定年熔岩序列对 Matuyama-Brunhes 逆转进行的古地磁研究
- 批准号:
9627927 - 财政年份:1996
- 资助金额:
$ 26.94万 - 项目类别:
Continuing Grant
RUI: Detailed Paleomagnetic Study of the Matuyama- Brunhes Reversal from Lavas on Tahiti, French Polynesia
RUI:法属波利尼西亚塔希提岛熔岩的 Matuyama-Brunhes 逆转的详细古地磁研究
- 批准号:
9418862 - 财政年份:1995
- 资助金额:
$ 26.94万 - 项目类别:
Standard Grant
Paleomagnetic Studies of Transitional Behavior Recorded in Pleistocene Lavas with Emphasis on Long-Lived Field States
更新世熔岩记录的过渡行为的古地磁研究,重点是长寿的磁场状态
- 批准号:
9205603 - 财政年份:1992
- 资助金额:
$ 26.94万 - 项目类别:
Continuing Grant
RUI: Determination of Absolute Paleointensity Using a Multi-Specimen Procedure
RUI:使用多样本程序测定绝对古强度
- 批准号:
8916859 - 财政年份:1990
- 资助金额:
$ 26.94万 - 项目类别:
Continuing Grant
Mathematical Sciences in the Year 2000: Assessment for Renewal in U.S. Colleges and Universities
2000 年的数学科学:美国学院和大学的更新评估
- 批准号:
8851133 - 财政年份:1988
- 资助金额:
$ 26.94万 - 项目类别:
Continuing Grant
Paleomagnetic Studies of Transitional Field Behavior with Emphasis on the Comparison of Different Types of Recordings
过渡场行为的古地磁研究,重点是不同类型记录的比较
- 批准号:
8708524 - 财政年份:1987
- 资助金额:
$ 26.94万 - 项目类别:
Standard Grant
RUI: High-Resolution, Long-Term Behavior of the GeomagneticField from Exposed Pleistocene Sediments of the Wanganui Basin, New Zeland
RUI:新西兰旺加努伊盆地暴露的更新世沉积物中地磁场的高分辨率、长期行为
- 批准号:
8417307 - 财政年份:1985
- 资助金额:
$ 26.94万 - 项目类别:
Continuing Grant
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