Absolute paleointensities on cretaceous kimberlites in Botswana

博茨瓦纳白垩纪金伯利岩的绝对古强度

基本信息

  • 批准号:
    55068635
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    德国
  • 项目类别:
    Research Grants
  • 财政年份:
    2008
  • 资助国家:
    德国
  • 起止时间:
    2007-12-31 至 2008-12-31
  • 项目状态:
    已结题

项目摘要

Superchrons provide a remarkable opportunity to test the various theories and models regarding convection in the Earth’s liquid outer core and the generation of the geomagnetic field. To obtain a complete picture of the geodynamo, determination of the paleointensity is crucial in addition to paleodirections, which were mainly determined in the past. So far only few studies have collected intensity data for the last 160 Ma. The great variety of their results led to three different models of long-term paleointensity changes (1: lower mean paleointensity during the Mesozoic than during the Cenozoic; 2: significantly higher intensity in the last 0.3 Ma than prior to that; 3: high mean paleointensity during the Cretaceous Normal Superchron, CNS). Much more high quality data is needed especially for the CNS to be able to confirm or reject these models and to decide between the different theories of the geodynamo. Kimberlites of cretaceous age, which are quite numerous in southern Africa, may provide an opportunity to obtain a high amount of intensity data for the CNS. The target of this study is, thus, to sample a variety of kimberlite pipes in Botswana and to check their suitability for paleointensity determination. Previous studies, which have focused on their paleodirectional characteristics, yielded very reliable data and the resulting paleomagnetic poles form an important part of Africa’s apparent polar wander path. However, alterations, either in situ or during the experiment, complicate paleointensity determination and further problems may arise due to differences in cooling rates, magnetic anisotropy of the remanence and magnetic domain state bias. It is therefore planned to carry out detailed rock magnetic and paleodirectional studies in combination with paleo-intensity determinations in order to gain complete knowledge about remanence acquisition processes in kimberlites. If paleointensity determinations turn out to be possible, we will be able to significantly increase the paleointensity data set.
超时提供了一个非凡的机会,以测试各种理论和模型,关于对流在地球的液体外核和产生的地磁场。为了获得一个完整的地球发电机的图片,除了古方向,这主要是在过去确定的古强度的确定是至关重要的。到目前为止,只有少数研究收集了过去160 Ma的强度数据。他们的结果的巨大变化导致了三种不同的模式的长期古强度变化(1:较低的平均古强度在中生代比在新生代; 2:显着较高的强度在过去的0.3马比之前; 3:高的平均古强度在白垩纪正常超时,CNS)。需要更多高质量的数据,特别是CNS能够确认或拒绝这些模型,并在不同的地球发电机理论之间做出决定。白垩纪的金伯利岩,这是相当多的南部非洲,可能会提供一个机会,以获得大量的强度数据的CNS。本研究的目标是,因此,在博茨瓦纳的金伯利岩管的各种样品,并检查其是否适合paleointensity测定。以往的研究主要集中在它们的古方位特征上,得到了非常可靠的数据,由此产生的古磁极构成了非洲视极移路径的重要组成部分,然而,无论是在原地还是在实验过程中,由于冷却速率、剩磁的磁各向异性和磁畴状态偏差的差异,古强度的确定都变得复杂,并可能出现进一步的问题。因此,计划进行详细的岩石磁性和古方向的研究,结合古强度测定,以获得完整的知识,在金伯利岩的剩磁收购过程。如果古地震强度测定成为可能,我们将能够显著增加古地震强度数据集。

项目成果

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Professor Dr. Valerian Bachtadse其他文献

Professor Dr. Valerian Bachtadse的其他文献

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{{ truncateString('Professor Dr. Valerian Bachtadse', 18)}}的其他基金

Paleomagnetism of Permian Basins in Morocco - A Contribution to Late Paleozoic Geodynamivs in the Western Mediterranean
摩洛哥二叠纪盆地的古地磁——对西地中海晚古生代地球动力学的贡献
  • 批准号:
    374919867
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Determination and appraisal of pyroclastic flow directions using magnetic anisotropy on ignimbrites from Mount Aragats, Armenia
利用亚美尼亚阿拉加茨山熔结岩的磁各向异性确定和评估火山碎屑流方向
  • 批准号:
    273101564
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Magnetostratigraphy of Pleistocene Sediments from the Republic of Georgia - Dating and Correlation of Climate Signals
格鲁吉亚共和国更新世沉积物的磁性地层学 - 气候信号的年代测定和相关性
  • 批准号:
    245125135
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Paleomagnetic studies of Hercynian dyke provinces in the Western Mediterranean: Quantification and tectonic implications of crustal block rotations
西地中海海西岩脉省的古地磁研究:地壳块旋转的量化和构造意义
  • 批准号:
    239681660
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Magnetostrategraphy and rock-magnetism of the Mead Stream section (Late Cretaceous - mid Eocene), New Zealand
新西兰米德溪剖面(白垩纪晚期 - 始新世中期)的磁地层学和岩石磁性
  • 批准号:
    213849507
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Strain rate analysis of the Kyrgyz Tien Shan from GPS and paleomagnetic data
利用 GPS 和古地磁数据分析吉尔吉斯天山的应变率
  • 批准号:
    207156275
  • 财政年份:
    2011
  • 资助金额:
    --
  • 项目类别:
    Research Grants
High Resolution Paleomagnetism and Magnetostratigraphy of Ferrar Volcanic rocks from the Southern Mesa Range (North Victoria Land, Antarctica)
梅萨山脉南部(南极洲北维多利亚地)费拉尔火山岩的高分辨率古地磁学和磁性地层学
  • 批准号:
    131563479
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Infrastructure Priority Programmes
Large Accretionary Complexes of the World: Evolution of the southern segment of the Central Asian Orogenic Belt
世界大型增生杂岩:中亚造山带南段的演化
  • 批准号:
    55313431
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Paläomagnetische Quantifizierung neogener Blockrotationen an einer aktiven, transtensionalen Plattengrenze, Baja California, Mexiko
墨西哥下加利福尼亚州活跃转张板块边界新近纪地块旋转的古地磁定量
  • 批准号:
    37108510
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Magnetostratigraphy of Plio-Pleistocene Lake Sediments from Armenia (Magnetostratigraphie Plio-Pleistozäner Seesedimente aus Armenien)
亚美尼亚普利翁-更新世湖沉积物的磁性地层学
  • 批准号:
    81200316
  • 财政年份:
    2008
  • 资助金额:
    --
  • 项目类别:
    Research Grants

相似海外基金

Collaborative Research: Origin of Magnetite and Magnetic Remanence in Submarine Basaltic Glass and Implications for Glass Paleointensities
合作研究:海底玄武岩玻璃中磁铁矿和剩磁的起源以及对玻璃古强度的影响
  • 批准号:
    0537981
  • 财政年份:
    2005
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    Standard Grant
Collaborative Research: Origin of Magnetite and Magnetic Remanence in Submarine Basaltic Glass and Implications for Glass Paleointensities
合作研究:海底玄武岩玻璃中磁铁矿和剩磁的起源以及对玻璃古强度的影响
  • 批准号:
    0538170
  • 财政年份:
    2005
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SGER - Ash Flow Tuffs: a New Material for Reliable Paleointensities
SGER - 灰流凝灰岩:一种可靠古强度的新材料
  • 批准号:
    0521374
  • 财政年份:
    2005
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    --
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    Standard Grant
Absolute Paleointensities From the Gilbert-Gauss to the Upper Mammoth Reversal Sequences in Lavas on the Wai'anae Volcano, Hawaii
夏威夷怀阿奈火山熔岩中从吉尔伯特-高斯到上猛犸象反转序列的绝对古强度
  • 批准号:
    0207787
  • 财政年份:
    2002
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    --
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Characteristics of the geomagnetic field : comprehensive understanding based on observational data and the dynamo theory
地磁场的特征:基于观测数据和发电机理论的综合认识
  • 批准号:
    12304024
  • 财政年份:
    2000
  • 资助金额:
    --
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Intrahemispheric Correlations: Relative Geomagnetic Paleointensities from the Subantarctic SE Atlantic
半球内相关性:亚南极东南大西洋的相对地磁古强度
  • 批准号:
    9711424
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