Several regional secular variation curves of the geomagnetic field have been proposed for Mexico over the last millennia. Despite a fairly large number of archeomagnetic data, these curves remain imprecise because of an uneven quality and geographic distribution, with a lack of data in Northern Mexico. Nine pottery kilns were sampled in Casas de Fuego, an archeological site in the Chihuahua state. These kilns belong to the Casas Grandes culture and were in use between 1250 and 1450 CE. Rock magnetic experiments indicate that the main magnetic phase is a Ti-poor titanomagnetite in the SD range. Mean characteristic directions per kiln were estimated by alternating field and/or thermal demagnetization, and archeointensities with the Thellier-Thellier protocol, after correction for anisotropy and cooling effects. The nine directions and eight intensities agree with data from USA and Mexico but do not support the peak in inclination modeled by the Mexican secular variation curve around 1200–1300 CE. For the last millennium, the Western North American curve is consistent with the SHAWQ2k global model, and better reflects the secular variation in Northern Mexico. For intensity, neither the SHAWQ2k model nor the regional intensity curve can depict the rapid secular variation that likely occurs circa 1500 CE. The Casas de Fuego results are the first full vector determinations obtained in Northern Mexico.

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来自墨西哥北部的第一个完整矢量考古地磁数据

在过去的几千年里，墨西哥提出了几条地磁场的区域长期变化曲线。尽管有相当多的古地磁数据，但由于质量和地理分布不均，墨西哥北部缺乏数据，因此这些曲线仍然不精确。在奇瓦瓦州的考古遗址 Casas de Fuego 采样了九个陶器窑。这些窑属于 Casas Grandes 文化，在公元 1250 年至 1450 年间使用。岩石磁性实验表明，主要磁性相是 SD 范围内的贫钛钛磁铁矿。在对各向异性和冷却效应进行校正后，通过交替场和/或热退磁以及使用 Thellier-Thellier 协议的考古强度估计每个窑的平均特征方向。九个方向和八个强度与来自美国和墨西哥的数据一致，但不支持由公元 1200-1300 年左右的墨西哥长期变化曲线建模的倾角峰值。近千年来，北美西部曲线与SHAWQ2k全球模型一致，更好地反映了墨西哥北部的长期变化。对于强度，SHAWQ2k 模型和区域强度曲线都无法描绘可能发生在公元 1500 年左右的快速长期变化。Casas de Fuego 结果是在墨西哥北部获得的第一个完整矢量测定结果。更好地反映了北墨西哥的长期变化。对于强度，SHAWQ2k 模型和区域强度曲线都无法描绘可能发生在公元 1500 年左右的快速长期变化。Casas de Fuego 结果是在墨西哥北部获得的第一个完整矢量测定结果。更好地反映了北墨西哥的长期变化。对于强度，SHAWQ2k 模型和区域强度曲线都无法描绘可能发生在公元 1500 年左右的快速长期变化。Casas de Fuego 结果是在墨西哥北部获得的第一个完整矢量测定结果。