Rock-magnetic and archeomagnetic survey from some classical settlements at Chapultepec archeological site (western Mesoamerica)

Abstract

Many archaeological artifacts contain magnetic minerals that may record the direction and strength of the Earth's magnetic field. The geomagnetic field parameters (declination, inclination and intensity) change through time and then may be used asa dating tool. Over the last three decades, the archeomagnetic method was successfully applied in Europe. Still, no systematic studies are devoted to the American sites. We report here, a detailed rock-magnetic and archeomagnetic investigation of some preColumbian settlements at Chapultepec archeological site (western Mesoamerica). Continuous low-field susceptibility vs. temperature curves performed in air point to Ti-poor titanomagnetites as remanence carriers. Hysteresis ratios fall essentially in the pseudo-single-domain region. The twelve oriented samples taken from the furnace located in the habitation area were demagnetized applying pick alternative fields. In most cases, a stable uni-vectorial remanent magnetization was found yielding a reasonably well defined mean characteristic direction: inclination I = 32.8, declination D = 353.4°, and parameters of Fisherian statistics  95 = 10.4° and k = 14. Still poorly defined directional master curves for Mesoamerica, together with relatively dispersed mean directions obtained in this study, make dating targets difficult. Archaeomagnetic dating was carried out on the basis of Bayessian statistics. This established a most probable time interval from 512 to 634 A.D. with an average of 573  61 A.D. K e y w o r d s : archeomagnetism, Mesoamerica, secular variation Continuation of LATINMAG Special Issue #4, Stud. Geophys. Geod., 54 (2010) V. López-Delgado et al. 330 Stud. Geophys. Geod., 55 (2011)

Geomagnetic Studies at Kyiv University: History and Prospects

“…Rock-magnetic and archeomagnetic survey from some classical settlements at Chapultepec archeological site (western Mesoamerica). Studia Geophysica et Geodaetica, 55,2,[329][330][331][332][333][334][335][336][337][338][339][340][341][342] 3. Blaha U., Appel E., Stanjek H., (2008).…”

“…Кроме того, важнейшей составляющей таких исследо-ваний выступают измерения магнитных свойств при-родных объектов. Последнее направление включает в себя как классические рок-магнитные работы, так и сформировавшиеся сравнительно недавно направле-ния археомагнетизм [1], педомагнетизм [2], магнетизм окружающей среды [3], атмомагнетизм [4] и т.д. Ниже поэтапно рассмотрим формирование всех обозначен-ных научных направлений геомагнетизма в историче-ской хронологии по отношению к развитию их в Киев-ском Университете, а также проанализируем совре-менное состояние этой проблемы.…”