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

This ebook 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. purely after those explosions a surge of recent reviews started to unreveal their volcanic heritage and impression.

This e-book offers the state-of-the-art advances in issues regarding the geologic environment of the 2 volcanoes, their eruptive background and composition of erupted items, the hydrothermal platforms and their manifestations. Volcanic risks and dangers and attainable mitigation plans are mentioned in line 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 The booklet also will comprise formerly unpublished fabric at the plant life and the fauna of the zone and archaeological and social facets of the realm that's inhabited through indigenous humans.

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2003). In Unit B, hornblende represents *2 vol% with a homogeneous compositions of magnesian hastingsite and minor tschermakite (Macías et al. 2003). L. Arce et al. (b) (a) Plg Amph Plg Plg Plg 1 mm 1 mm Px (d) (c) Amph Plg Plg Px Amph Amph 1 mm (e) Plg Px (f) Amph Px Plg Amph 1 mm Fig. 2 a Cross-polarized microphotograph of Unit B pumice sample, showing a porphyritic texture, with phenocrysts of plagioclase (Plg), pyroxene (Px), amphibole (Amph), Fe-Ti oxides (oxi) in a groundmass and vesicular matrix (After Macías et al.

It lies on the trace of the sinistral Polochic-Motagua Fault zone, which according to Guzman-Speziale et al. (1989) represents the boundary between the North American and Caribbean plates in Guatemala and southern Mexico. The TVC is located *200 km from the MAT, and approximately 100 km above the subducting Cocos slab which dips about 40º (Rebollar et al. 1999; Syracuse and Abers 2006). e. Carr et al. 1990; Feigenson and Carr 1993; Carr et al. 2003; Abers et al. 2003; Bolge et al. 2009). Despite the clear relationship of the CAVA with the Cocos plate subduction, large variations in trace elements and isotopic ratios have been reported at regional level (Carr et al.

2000; Layer et al. 2009, see Chap. 3). 30 (a) (b) 12 Tephriphonolite 10 8 Na2O+K2O Fig. 3 a Total alkalies versus silica diagram (Le Bas et al. 1986), of El Chichón samples; b–j Harker diagrams. Major elements in wt% (recalculated on anhydrous basis) and trace elements in parts per million (ppm). Data taken from Luhr et al. (1984), Rose et al. (1984), McGee et al. (1987), Espíndola et al. (2000), Macías et al. (2003), Andrews et al. (2008), Layer et al. (2009) and Arce et al. L. Arce et al. 1 (f) (e) 4 K2O MgO 11 3 9 7 2 5 1 3 1 0 (g) (h) 13 2000 Ba 1500 11 1000 9 500 7 0 5 (i) Fe2O3* (j) 20 2 TiO2 K2O/P2O5 15 10 1 5 0 40 50 60 SiO2 70 0 40 60 50 SiO2 70 2 Petrology and Geochemistry … 31 In general, all El Chichón samples are K-rich, and some unusually P-rich (Fig.

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