Geology

Active Volcanoes of Chiapas (Mexico): El Chichón and Tacaná

This book summarizes the experiences conducted at of the main energetic volcanoes of Chiapas (Mexico): El Chichón and Tacaná. El Chichón erupted explosively in 1982 killing greater than 2000 humans being the worst volcanic catastrophe in Mexico, and Tacaná produced light phreatic explosions in 1950 and 1986. basically after those explosions a surge of recent experiences started to unreveal their volcanic background and impression.

This publication offers the cutting-edge advances in subject matters regarding the geologic environment of the 2 volcanoes, their eruptive background and composition of erupted items, the hydrothermal structures and their manifestations. Volcanic dangers and hazards and attainable mitigation plans are mentioned in accordance with the event of the catastrophic eruption of El Chichón that happened in 1982. The booklet also will comprise formerly unpublished fabric at the plant life and the fauna of the quarter and archaeological and social facets of the realm that's inhabited by means of indigenous humans.

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Extra info for Active Volcanoes of Chiapas (Mexico): El Chichón and Tacaná (Active Volcanoes of the World)

Sample text

Fresh pumice samples contained up to 2 wt% suhedral to euhedral, anhydrite crystals, in association with hornblende, biotite, and sphene phenocrysts (Luhr et al. 1984). Moreover, the trachyandesites emitted in 1982 were rich in K, Rb, Sr, Th, U, and Cs, compared to other Mexican and Central American volcanoes, fact that was attributed to the relatively large distance from the Middle America Trench (Luhr et al. 1984) (Fig. 1). Alkaline rocks in subduction zones have been linked to the presence of fracture zones (DeLong et al.

Evidence for such high content was the generation of anhydrite crystals recognized for the first 92° 90° 88°W 2 Petrology and Geochemistry … time in pumice samples of the 1982 eruption. Fresh pumice samples contained up to 2 wt% suhedral to euhedral, anhydrite crystals, in association with hornblende, biotite, and sphene phenocrysts (Luhr et al. 1984). Moreover, the trachyandesites emitted in 1982 were rich in K, Rb, Sr, Th, U, and Cs, compared to other Mexican and Central American volcanoes, fact that was attributed to the relatively large distance from the Middle America Trench (Luhr et al.

11 El Chichón and Tacaná samples plotted on Ba versus La and Ba/La versus U/Th diagrams. Notice that the behavior of Tacaná rocks suggests an important slab contribution in generating magmas (Carr et al. 1990). Data from Arce et al. (2014) 2 Petrology and Geochemistry … beneath Tacaná, as recently proposed by Arce et al. e. Walker et al. 2003). A greater influence of the slab would be also indicated by the higher 87Sr/86Sr ratios of the Tacaná volcanic rocks (Fig. 5). Incoming mafic magmas are somewhat heterogeneous considering that a high-Ti component must also be entering the magmatic system (Fig.

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