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Paleomagnetic results form Costa Rica, Jan Mayen and Spitsbergen: An investigation of paleosecular variation over the last 10 Ma.

机译:哥斯达黎加,扬·马延和斯匹次卑尔根的古磁结果:对过去10 Ma的古生物变化的调查。

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摘要

Paleosecular variation (PSV) models require high-quality, globally distributed paleomagnetic data sets in order to accurately predict observed geomagnetic field behavior. Previous paleomagnetic studies have lacked modern high-quality directional data, especially at equatorial and high northern latitudes. As a result of these incomplete data sets, PSV models, notably Model G [McFadden et al., 2008] and TK03 [Tauxe and Kent, 2004], may not accurately predict PSV behavior. We present 65 high-quality directional paleomagnetic sites from low (Costa Rica) and high northern (Jan Mayen and Spitsbergen) latitudes. We also compile a new paleomagnetic data set, PSV10, and investigate VGP dispersion with latitude. PSV10 spans the last 10 Ma and includes all published studies that meet our selection criteria. We do not incorporate a latitudinal VGP cutoff and include all sites regardless of VGP latitude, so long as the published study does not intentionally sample transitional directions. Transitional directions are a natural aspect of secular variation, and removing them biases PSV behavior, especially at high latitudes where scatter is greater. Model G and TK03 underestimate dispersion of virtual geomagnetic poles (VGPs), of PSV10, at high and low latitudes. Attempts to modify the model parameters of Model G and TK03 to fit PSV10 were unsuccessful. PSV10 shows significant latitudinal variation between equatorial and high latitude sites, while dispersion across low to mid-latitudes is fairly consistent New PSV models must be developed to explain the observed behavior of the magnetic field.
机译:千层变化(PSV)模型需要高质量的全球分布的古地磁数据集,以便准确地预测观测到的地磁场行为。以前的古地磁研究缺乏现代高质量的定向数据,尤其是在赤道和北部高纬度地区。由于这些不完整的数据集,PSV模型,尤其是模型G [McFadden et al。,2008]和TK03 [Tauxe and Kent,2004],可能无法准确预测PSV行为。我们介绍了低纬度(哥斯达黎加)和高纬度纬度(扬·马延和斯匹次卑尔根)的65个高质量的定向古磁性站点。我们还编译了一个新的古磁数据集PSV10,并研究了纬度对VGP色散的影响。 PSV10跨越最后10 Ma,并包括所有符合我们选择标准的已发表研究。我们不会纳入纬度VGP截止值,并且不考虑纬度VGP的纬度就包括所有站点,只要已发表的研究没有有意抽取过渡方向样本即可。过渡方向是长期变化的自然方面,将其移除会偏向PSV行为,尤其是在散射较大的高纬度地区。 G型和TK03型低估了高低纬度地区PSV10的虚拟地磁极(VGP)的扩散。尝试修改Model G和TK03的模型参数以适合PSV10的尝试均未成功。 PSV10在赤道和高纬度站点之间显示出明显的纬度变化,而在低纬度至中纬度范围内的色散是相当一致的,必须开发新的PSV模型来解释观察到的磁场行为。

著录项

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Geology.
  • 学位 M.S.
  • 年度 2010
  • 页码 47 p.
  • 总页数 47
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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