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Multiple High-resolution Records of Geomagnetic Field Reversals from Plio-Pleistocene Sediments in Confidence Hills, Death Valley, California

Multiple High-resolution Records of Geomagnetic Field Reversals from Plio-Pleistocene Sediments in Confidence Hills, Death Valley, California
加利福尼亚州死亡谷信心山上皮奥-更新世沉积物的地磁场反转的多个高分辨率记录
批准号:
9419041
负责人:
Joseph Kirschvink
金额:
$9.94万
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1995
资助国家:
美国
项目状态:
已结题
起止时间:
1995-06-01 至 1997-05-31

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英文摘要
Kirschvink 9419041 Recent high-resolution studies of geomagnetic reversals have generated heated debate concerning whether or not their transitional Virtual Geomagnetic Pole positions (VGPs) fall along two preferred longitudinal bands, one centered over the Americas and an antipodal one over Australasia. If these preferred bands are indeed real, it would suggest control of the transitional field geometry by geological structures at the core/mantle boundary. However, alternative interpretations of these data include the suggestion that the banding is an artifact of the process through which the sediments acquire their remanent magnetization, and/or an artifact of the non-random distribution of sampling sites. Resolution of these questions will require the detailed study of additional high-resolution records of geomagnetic reversals, particularly from sites located within the preferred longitudinal bands where data are scarce. Work conducted previously on the Plio-Pleistocene lake sediments in the Confidence Hills of southern Death Valley, California, has provided multiple, high-resolution records of the top and bottom reversals of the Olduvai event. In addition, tectonic deformation of the strata make it easy to distinguish the present field direction form the characteristic directions, and allow a classic paleomagnetic 'fold test' to be conducted on the transitional directions. These results demonstrate that the two reversals are quite different -- the lower Olduvai is consistent with confinement of the intermediate VGP directions to the Australasian regions whereas VGPs from the upper Olduvai lie 90 degrees away from these bands. The PI will extend this detailed study and comparison to reversals associated with the Reunion and Jaramillo subchrons. This is the only way in which a sufficient quantity of fully reliable data can be acquired, and should provide a critical test of the longitudinal confinement hypothesis. ****
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Collaborative Research: Development of a turnkey SQUID microscope platform for paleomagnetism and installation in a National Multi-User Facility
  • 批准号:
    1906042
  • 项目类别:
    Standard Grant
  • 资助金额:
    $4.23万
  • 财政年份:
    2019
  • 负责人:
    Joseph Kirschvink
  • 依托单位:
Paleomagnetism and Magnetostratigraphy of the James Ross Basin, Antarctica
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    1341729
  • 项目类别:
    Standard Grant
  • 资助金额:
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  • 财政年份:
    2014
  • 负责人:
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  • 依托单位:
Magnetostratigraphy of Cretaceous Sediments in the James Ross Island Basin, Antarctica
  • 批准号:
    1303896
  • 项目类别:
    Standard Grant
  • 资助金额:
    $5.62万
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    2013
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Collaborative Research: Testing the Hypothesis of Late Cretaceous True Polar Wobble (TPw)
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    1114432
  • 项目类别:
    Standard Grant
  • 资助金额:
    $25.74万
  • 财政年份:
    2011
  • 负责人:
    Joseph Kirschvink
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  • 资助金额:
    30.0万元
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  • 项目类别:
    重大研究计划
  • 资助金额:
    900.0万元
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    陈良怡
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基于Resolution算法的交互时态逻辑自动验证机
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    61303018
  • 项目类别:
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