A new set of qualitative reliability criteria to aid inferences on palaeomagnetic dipole moment variations through geological time
A new set of qualitative reliability criteria to aid inferences on palaeomagnetic dipole moment variations through geological time
复制标题
一套新的定性可靠性标准，有助于推断地质时期的古地磁偶极矩变化
DOI：
10.3389/feart.2014.00024
复制
发表时间：
2014-01-01
影响因子：
2.9
通讯作者：
Paterson, Greig A.
中科院分区：
文献类型：
--
作者：
Biggin, Andrew J.;Paterson, Greig A.
反转频率的记录支持在地质时间尺度上对地球发电机的强迫，但获得更早的时间（例如，前寒武纪）是一个重大挑战。测量到的地球虚拟（轴向）偶极矩的变化，在数百万年或更长时间内的平均值，也有可能限制地核和地幔的演化。最近在古地震烈度方法方面有了大量的创新，但目前还没有全面的方法来评估新的和现有的偶极矩数据的可靠性。在这里，我们提出了一套新的主要是定性的可靠性标准的古强度结果在网站的平均水平，我们长期QPI参考长期Q标准用于评估古磁极。这些代表了第一次尝试捕获的范围内的偏置剂适用于palaeointensity测量，并认识到各种方法，采用来解释它们。共提出了8个标准，并应用于最近纳入PINT全球数据库的312个偶极矩估计。在检查的数据集中，单个偶极矩估计值（Qpi值）满足的这些标准的数量在1和6之间变化，中位数为3。每项标准的成功率差异很大，但至少有几项结果符合每项标准。新的标准将是有用的，为未来的研究作为衡量新的和出版的偶极矩估计的可靠性的一种手段。
Records of reversal frequency support forcing of the geodynamo over geological timescales but obtaining these for earlier times (e.g., the Precambrian) is a major challenge. Changes in the measured virtual (axial) dipole moment of the Earth, averaged over several millions of years or longer, also have the potential to constrain core and mantle evolution through deep time. There have been a wealth of recent innovations in palaeointensity methods, but there is, as yet, no comprehensive means for assessing the reliability of new and existing dipole moment data. Here we present a new set of largely qualitative reliability criteria for palaeointensity results at the site mean level, which we term Qpi in reference to the long-standing Q criteria used for assessing palaeomagnetic poles. These represent the first attempt to capture the range of biasing agents applicable to palaeointensity measurements and to recognize the various approaches employed to obviate them. A total of 8 criteria are proposed and applied to 312 dipole moment estimates recently incorporated into the PINT global database. The number of these criteria fulfilled by a single dipole moment estimate (the Qpi value) varies between 1 and 6 in the examined dataset and has a median of 3. Success rates for each of the criteria are highly variable, but each criterion was met by at least a few results. The new criteria will be useful for future studies as a means of gauging the reliability of new and published dipole moment estimates.