First full vector archeomagnetic data from Northern Mexico

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