Palaeosecular variation recorded by lava flows over the past five million years
Palaeosecular variation recorded by lava flows over the past five million years
复制标题
过去五百万年熔岩流记录的古世变
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
C. Constable
中科院分区：
文献类型：
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作者：
C. Johnson;C. Constable
我们提出了一个新的全球古地磁数据库，包括熔岩流和薄侵入体，适合研究古地球变化和时间平均场。该数据库在附录中提供了一些详细信息，并且可以从作者那里在线获取。我们回顾了迄今为止的古世俗变异模型，强调了所需的假设以及许多模型的相当随意的构建。对新数据库统计特性的初步研究表明，现有的古世变模型不足以解释该领域的长期时间变化。越来越明显的是，数据分布和质量对于确定长期变化的特征至关重要。这里介绍的工作表明，在建立可靠的古世变模型之前，需要修改正常极性和反向极性的时间平均场结构模型。
We present a new global palaeomagnetic database, comprising lava flows and thin intrusive bodies, suitable for studying palaeosecular variation and the time-averaged field. The database is presented in some detail in the appendix and is available on-line from the authors. We review palaeosecular variation models to date, emphasizing the assumptions required and the rather arbitrary construction of many of these models. Preliminary studies of the statistical properties of the new database suggest that existing palaeosecular variation models are inadequate to explain the long-term temporal variations in the field. It is increasingly apparent that data distribution and quality are pivotal in determining the characteristics of the secular variation. The work presented here demonstrates the need for revised models of the time-averaged field structure for both normal and reverse polarities before reliable models for palaeosecular variation can be made.