By Teresa Scolamacchia, José Luis Macías
This book summarizes the stories conducted at of the main lively 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 gentle phreatic explosions in 1950 and 1986. purely after those explosions a surge of recent experiences started to unreveal their volcanic heritage and effect.
This e-book provides the state-of-the-art advances in issues concerning the geologic surroundings of the 2 volcanoes, their eruptive background and composition of erupted items, the hydrothermal structures and their manifestations. Volcanic risks and dangers and attainable mitigation plans are mentioned in keeping with the event of the catastrophic eruption of El Chichón that happened in 1982. The e-book also will comprise formerly unpublished fabric at the plant life and the fauna of the quarter and archaeological and social elements of the world that's inhabited through indigenous people.
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Extra resources for Active Volcanoes of Chiapas (Mexico): El Chichón and Tacaná
7i) would indicate that crustal contamination plays an important role during magmatic differentiation (Arce et al. 2014). Macías et al. (2000) already emphasized the role of magma mixing for Tacaná products. They proposed that maﬁc magma (54 wt% SiO2) entered to an existing magmatic reservoir and mixed with the resident andesitic melt (60–63 wt% SiO2). Mixing produced the observed maﬁc enclaves in the Mixcun pyroclastic flow deposit (see Chap. 6). Such mixing event would have been responsible for destabilizing the magmatic system and provoking the eruption *1950 years before present (Macías et al.
Plg plagioclase; Amph amphibole; Cpx clinopyroxene (after Arce et al. 2012) 2 Petrology and Geochemistry … Plagioclase is the most abundant mineral phase in all pumice samples, often with complex zonation (Mora et al. 2004). Anorthite contents commonly vary from An67 to An42 for the Sibinal Pumice and Tacaná Pumice deposits (Arce et al. 2008), whereas for the La Vega pyroclastic flow deposit, a wider range is recorded (An75–An45). Clinopyroxene (diopside) and orthopyroxene (hypersthene) are also abundant in pumice deposits and compositionally homogenous (Arce et al.
They are subhedral to euhedral, and in some samples exhibit reaction rims composed of amphibole and plagioclase. Amphibole phenocrysts are subhedral to anhedral, sometimes with a reaction rim (coronae surrounding the crystals) made of Fe-Ti oxides (Fig. 6b) suggesting changes in the ascent velocity during the eruption (Browne and Gardner 2006), or simply oxidation of the amphibole. Although there are robust whole-rock chemical data sets for the TVC, only few include a complete set of trace elements, for which reason only a reduced number of samples appear in some graphs.
Active Volcanoes of Chiapas (Mexico): El Chichón and Tacaná by Teresa Scolamacchia, José Luis Macías