Preliminary chemical and petrographic results of the march-april "El Chichon" volcanics
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Abstract
Chemical and petrographic analyses were done for three samples of the products of "El Chichon", March-April eruption. Chemical analyses yield an andesitic composition for the magma with a high gas-content. Petrographic analyses show anhydrite in two of the samples, this is interpreted as a result of contamination with sulphur waters and evaporites, observed in the area. Obtained results may indicate a very shallow magma chamber. The total mass of the water soluble components ejected was calculated to be of the order of 31.8 x 106 Ton., assuming a total mass of the ejecta of 0.5 km3.
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Prol Ledesma, R. M., Medina, F., Choporov, D. Y., Frikh K., D. I., Muravitskaya, G. N., Polak, B. G., & Stepanets, M. I. (1982). Preliminary chemical and petrographic results of the march-april "El Chichon" volcanics. Geofisica Internacional, 21(1), 1–10. https://doi.org/10.22201/igeof.00167169p.1982.21.1.1073
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