Archaeomagnetic intensity results from California and Ecuador: evaluation of regional data
Archaeomagnetic intensity results from California and Ecuador: evaluation of regional data
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DOI：
10.1016/s0012-821x(02)00927-5
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发表时间：
2002-11-15
影响因子：
5.3
通讯作者：
Tauxe, L
中科院分区：
文献类型：
--
作者：
Bowles, J;Gee, J;Tauxe, L
我们提供了加利福尼亚东南部（相似于33度，相似于115度西经，50-1500年BP）和南美洲西北部（厄瓜多尔，2.4度，80.7度西经，4000-5000年BP）的新考古强度数据。这些结果代表了来自加利福尼亚的唯一数据，以及南美洲西北部目前可获得的最古老的考古强度数据。在将我们的结果与先前发表的美国西南部和南美洲西北部的数据进行比较时，我们注意到现有数据中的显著分散使得比较和解释变得困难。我们对数据散射的来源（包括年龄不确定性、实验误差、冷却速率差异、磁各向异性和场畸变）进行了分析，并评估了散射和误差对平滑考古强度记录的影响。通过在可能的情况下进行更正并消除有问题的数据，大大减少了分散，特别是在南美洲，但远远没有消除。然而，我们认为，强度的长期波动是可以解决的，并且可以确定西南和南美记录之间的差异。西南资料与南美资料的区别在于，在类似于0-600年BP的范围内，虚拟轴向偶极矩值要高得多，而在类似于1000-1500年BP的范围内，虚拟轴向偶极矩值要低得多。与全球古场模型的比较揭示了这两个地区的模型与考古强度数据之间的差异，强调了需要额外的强度数据来约束世界上大部分地区的模型。(C) 2002 Elsevier Science B.V.版权所有
We present new archaeointensity data for southeastern California (similar to33degreesN, similar to115degreesW, 50-1500 yr BP) and northwestern South America (Ecuador, 2.4degreesS, 80.7degreesW, 4000-5000 yr BP). These results represent the only data from California, as well as the oldest archaeointensity data now available in northwestern South America. In comparing our results to previously published data for the southwestern United States and northwestern South America, we note that significant scatter in the existing data makes comparisons and interpretations difficult. We undertake an analysis of the sources of data scatter (including age uncertainty, experimental errors, cooling rate differences, magnetic anisotropy, and field distortion) and evaluate the effects of scatter and error on the smoothed archaeointensity record. By making corrections where possible and eliminating questionable data, scatter is significantly reduced, especially in South America, but is far from eliminated. However, we believe the long-period fluctuations in intensity can be resolved, and differences between the Southwestern and South American records can be identified. The Southwest data are distinguished from the South American data by much higher virtual axial dipole moment values from similar to 0-600 yr BP and by a broad low between similar to 1000-1500 yr BP. Comparisons to global paleofield models reveal disagreements between the models and the archaeointensity data in these two regions, underscoring the need for additional intensity data to constrain the models in much of the world. (C) 2002 Elsevier Science B.V. All rights reserved.