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Vlag, P., Alva-Valdivia, L., de Boer, C.B., Gonzalez, S. and Urrutia-Fucugauchi, J. (2000). A rock- and paleomagnetic study of a Holocene lava flow in central Mexico. Physics of the Earth and Planetary Interiors 118(3-4): 259-272. doi: 10.1016/S0031-9201(99)00158-2. |
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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 degrees C and a Ti-poor magnetite with a Curie temperature close to 580 degrees C. Magnetic changes after heating indicate that the titanomagnetite exsolves into magnetite and ilmenite when the sample is heated to 580 degrees C. Paleointensity estimates with the Thellier and Thellier method [Thellier, E., Thellier, O., 1959. Sur l'intensite du champ magnetique terrestre dans le passe historique et geologique. Ann. Geophysique, 15, 285-376] were only successful up to temperatures of 350 to 400 degrees 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 degrees C heating may explain the large variations in previous paleointensity determinations for the Tres Cruces rocks [Gonzalez, S., Sherwood, G., Bohnel, 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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Table 1 |
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Paleomagnetic Measurements |
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Keywords
andesites, Cenozoic, central Mexico, Holocene, igneous rocks, lava, flows, magnetic field, magnetic intensity, magnetization, measurement, Mexico, oxides, P-T conditions, paleomagnetism, pole positions, Quaternary, relative age, secular variations, temperature, titanomagnetite, Tres Cruces, volcanic rocks, volcanism, volcanoes, 03, Geochronology |
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Elsevier Science
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(+31) 20 485 3757
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