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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Archaeomagnetic intensity results from California and Ecuador: evaluation of regional data
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Archaeomagnetic intensity results from California and Ecuador: evaluation of regional data

机译：加利福尼亚和厄瓜多尔的古地磁强度结果：区域数据评估

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We present new archaeointensity data for southeastern California (～33°N, ～115°W, 50-1500 yr BP) and northwestern South America (Ecuador, 2.4°S, 80.7°W, 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 ～0-600 yr BP and by a broad low between ～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.
机译：我们提供了加利福尼亚东南部（〜33°N，〜115°W，50-1500 BP）和南美西北部（厄瓜多尔，2.4°S，80.7°W，4000-5000 BP）的新古强度数据。这些结果代表了加利福尼亚州的唯一数据，以及南美洲西北部现在可用的最古老的古强度数据。在将我们的结果与美国西南部和南美洲西北部以前发布的数据进行比较时，我们注意到现有数据的显着分散使得比较和解释变得困难。我们对数据散布的来源（包括年龄不确定性，实验误差，冷却速率差异，磁各向异性和场失真）进行了分析，并评估了散布和误差对平滑古地理强度记录的影响。通过在可能的情况下进行更正并消除可疑数据，可以显着减少散布，特别是在南美，但远没有消除。但是，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。西南地区的数据与南美地区的数据之间的区别在于，较高的虚拟轴向偶极矩值在〜0-600 yr BP处较高，而在〜1000-1500 yr BP之间则存在较宽的低点。与全球古场模型的比较揭示了这两个地区的模型与古强度数据之间的分歧，从而强调了需要更多的强度数据来约束世界上许多地方的模型。

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