Geomagnetic secular variation and the statistics of palaeomagnetic directions
Geomagnetic secular variation and the statistics of palaeomagnetic directions
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DOI：
10.1111/j.1365-246x.2011.05050.x
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发表时间：
2011-08-01
影响因子：
2.8
通讯作者：
Biggin, Andrew J.
中科院分区：
文献类型：
--
作者：
Deenen, Martijn H. L.;Langereis, Cor G.;Biggin, Andrew J.
在这项研究中，我们研究的作用，古长期变化（PSV）在使用统计古地磁研究，我们提供了新的可靠性标准古磁极或方向。我们首先得出结论，Fisher统计量不应应用于平均古地磁方向，而应应用于虚拟地磁极（VGP）分布;其次，我们强烈主张在评估古地磁数据集时考虑地磁场行为的典型特性。与纬度相关的性质（E，S，k）为古地磁数据集的可靠性提供了有用的指南。对这些性质的可靠评估取决于所采集的（足够的）古地磁样本数量。因此，作为评估数据集的附加工具，我们提供了一个N相关的A95包络，由上限A95最大值和下限A95（最小值）限定，有助于确定分布是否具有足够好的采样PSV，从而确定地磁场行为。应用这些标准对于地磁行为的研究或旨在使用TK 03的研究是必不可少的。通过伸长/倾斜（E/I）方法进行倾斜误差校正的GAD。对于旨在地质重建的古地磁研究，它们形成了有用的指导方针，并增加了对岩石忠实记录该领域的信心。对已发表的东地中海数据的分析表明，绝大多数研究不符合货车德沃标准，特别是关于N和A95。我们已经提供了一方面更宽松（较低的N仍然可以提供相关信息），另一方面更严格（对于高N，A95 < 16度的标准应该适应较低的A95的要求，即。G. A95 < 5 degrees for N >80）。
In this study, we examine the role of palaeosecular variation (PSV) in the use of statistics for palaeomagnetic studies, and we provide new reliability criteria for palaeomagnetic poles or directions. We first conclude that Fisher statistics should not be applied to average palaeomagnetic directions but to virtual geomagnetic pole (VGP) distributions instead.Secondly, we strongly advocate that typical properties of geomagnetic field behaviour are taken into account in the assessment of palaeomagnetic data sets. The latitude-dependent properties (E, S, k) provide useful guidelines for the reliability of a palaeomagnetic data set. A reliable assessment of these properties depends on the (sufficient) number of palaeomagnetic samples being taken. Therefore, as an additional instrument of assessing data sets, we provide a N-dependent A95 envelope, bounded by an upper limit A95max, and a lower limit A95(min) that helps to ascertain whether or not a distribution has sufficiently well-sampled PSV and therefore geomagnetic field behaviour. Applying these criteria is indispensable for studies of geomagnetic behaviour, or for studies aiming at using TK03. GAD for inclination error correction through the elongation/inclination (E/I) method. For palaeomagnetic studies aimed at geological reconstructions, they form helpful guidelines and increase the confidence in the rocks having faithfully recorded the field.An analysis of published Eastern Mediterranean data shows that the vast majority of studies do not conform to the Van der Voo criteria, in particular with respect to N and A95. We have provided criteria that are on the one hand more lenient (lower N may still provide relevant information), and on the other hand more strict (for high N the criterion of A95 < 16 degrees should be adapted to a requirement of lower A95, e. g. A95 < 5 degrees for N > 80).