Composición química (elementos mayores) de los magmas en el cinturón volcánico mexicano

Aguilar, V. H.; Verma, S. P.

Instituto de Geofísica, UNAM, publicado en Geofísica Internacional, y cosechado de Revistas UNAM

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Aguilar, V. H., et al. (1987). Composición química (elementos mayores) de los magmas en el cinturón volcánico mexicano. Geofísica Internacional; Vol. 26 No. 2, 1987. Recuperado de

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Aguilar, V. H.; Verma, S. P.
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Composición química (elementos mayores) de los magmas en el cinturón volcánico mexicano
A compilation is presented of 1797 major-element analyses of igneous rocks belonging to the Mexican Volcanic Belt (MVB). The geological significance of these geochemical data is inferred from a series of histograms and diagrams (bivariate and ternary) following a subdivision of this volcanic province into 10 morphological blocks. Although there has been a spectacular increase in the number of major-element analyses since the first compilation by Pal et at. (1978) having that number increased from 330 to 1797 in the year 1985, it is evident that there still exists a great scarcity of such geochemical data in certain zones of the MVB (e.g., blocks V, VII and VIII). From the present compilation and analysis it is observed that both calc-alkaline and alkaline magmas have erupted in the western and eastern extremes of the MVB, whereas calc-alkaline products dominate in the central part of the Belt. Thus in contrast with the other circum-Pacific volcanic provinces the MVB does not show a lateral variation in its volcanic products because a gradual increase in their alkali-contents is not observed as the distance between the magmatic arc and the subduction zone increases. On the other hand, the volcanic products of all the important strato-volcanoes show a somewhat similar evolution as judged from the various binary and ternary diagrams, suggesting the existence of magmatic differentiation dominated mainly by fractional crystallization and accompanied by magma mixing at some stage of their evolution.