New Thellier-Coe archeointensity determinations have been measured on 15 potsherds from the Oaxaca Valley belonging to three of the four Formative Periods (Pre-Classical) of Mesoamerica, spanning 1400-700 BC. Seven of these are considered to be reliable and indicate a geomagnetic field strength of about 30 mu T. This value is some 75% of the present geomagnetic field strength but is in agreement with the absolute intensities predicted from global models for this time and location, and consistent with coeval published determinations. These data thus provide significant evidence for the geomagnetic field strength in an area and for a time that was previously poorly constrained, thus providing an important contribution towards establishing a local master curve for the last 3500 yr. When established, such a curve would be a useful dating tool and also enable establishing for field strength correlations with climatic events and civilization evolutions in a region that is particularly strong in archeological and geological features. Such potential is examined for aridity events, although such observations can only be considered tentative at this stage. (c) 2012 University of Washington. Published by Elsevier Inc. All rights reserved.
- Geomagnetic field
- Rock magnetism
- Intensity global models
- Master curve
- Climate changes
- Civilization evolutions
- Formative period
- EARTHS MAGNETIC-FIELD
- SECULAR VARIATION
- PALEOINTENSITY DETERMINATIONS
[Petronille, Marie; Goguitchaichvili, Avto; Morales, Juan] Univ Nacl Autonoma Mexico, Lab Interinst Magnetismo Nat, Inst Geofis, Unidad Michoacan, Mexico City 04510, DF, Mexico; [Goguitchaichvili, Avto] Univ Burgos, Lab Paleomagnetismo, Dept Fis, Escuela Politecn Super, Burgos 09006, Spain; [Carvallo, Claire] Univ Paris 06, Inst Mineral & Phys Milieux Condenses, Paris, France; [Hueda-Tanabe, Yuki] WWF Programa Oaxaca, Oaxaca, Mexico
Petronille, M (reprint author), Univ Nacl Autonoma Mexico, Lab Interinst Magnetismo Nat, Inst Geofis, Unidad Michoacan, Campus Morelia, Mexico City 04510, DF, Mexico.
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), UMR7590