Petrologic characteristics of the 1982 and pre-1982 eruptive products of El Chichon volcano, Chiapas, Mexico
Geofisica Internacional
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Abstract
Studies on a suite of rocks from this volcano indicate that the juvenile materials of the 1982 and pre-1982 eruptions of the volcano have essentially the same mineralogy and chemistry. Data suggest that chemical composition changed little over the 0.3 m.y. sample period. Modally, plagioclase is the dominant phenocryst, followed by amphibole, clinopyroxene and minor phases including anhydrite. Plagioclase phenocrysts show complex zoning: the anorthite-rich zones are probably the result of changing volatile P on the magma and may reflect the changes in the volcano's magma reservoir in response to repetitive, explosive eruptive activity.-R.E.S.
Suggested Citation
McGee, J.J., Tilling, R., Duffield, W.A., 1987, Petrologic characteristics of the 1982 and pre-1982 eruptive products of El Chichon volcano, Chiapas, Mexico: Geofisica Internacional, v. 26, no. 1, p. 85-108, https://doi.org/10.22201/igeof.00167169p.1987.26.1.1190.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Petrologic characteristics of the 1982 and pre-1982 eruptive products of El Chichon volcano, Chiapas, Mexico |
| Series title | Geofisica Internacional |
| DOI | 10.22201/igeof.00167169p.1987.26.1.1190 |
| Volume | 26 |
| Issue | 1 |
| Publication Date | January 01, 1987 |
| Year Published | 1987 |
| Language | English |
| Publisher | Universidad Nacional Autónoma de México |
| Description | 24 p. |
| First page | 85 |
| Last page | 108 |
| Country | Mexico |
| State | Chiapas |
| Other Geospatial | El Chichon volcano |