A rock- and paleomagnetic study of a Holocene lava flow in Central Mexico

Details A rock- and paleomagnetic study of a Holocene lava flow in Central Mexico A rock- and paleomagnetic study of a Holocene lava flow in Central Mexico

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..118..259v&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 118, Issue 3-4, p. 259-272.

Physics

5

Scientific paper

Magnetic measurements of the Tres Cruces lava flow (ca. 8500 years BP, Central Mexico) show the presence of two remanence carriers, a Ti-rich titanomagnetite with a Curie temperature between 350 and 400°C and a Ti-poor magnetite with a Curie temperature close to 580°C. Magnetic changes after heating indicate that the titanomagnetite exsolves into magnetite and ilmenite when the sample is heated to 580°C. Paleointensity estimates with the Thellier and Thellier method [Thellier, E., Thellier, O., 1959. Sur l'intensité du champ magnétique terrestre dans le passé historique et géologique. Ann. Géophysique., 15, 285-376] were only successful up to temperatures of 350 to 400°C. This temperature corresponds with the Curie temperature of the titanomagnetite, which is probably pseudo-single or multi-domain. Therefore, the paleointensities should be interpreted with caution. The magnetic composition changes after 580°C heating may explain the large variations in previous paleointensity determinations for the Tres Cruces rocks [Gonzalez, S., Sherwood, G., Böhnel, H., Schnepp, E., 1997. Palaeosecular variation in Central Mexico over the last 30,000 years: the record from lavas. Geophys. J. Int., 130, 201-219] using the Shaw method [Shaw, J., 1974. A new method of determining the magnitude of the palaeomagnetic field: application to five historic lavas and five archaeological samples. Geophys. J. R. Astr. Soc., 39, 133-141].

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