Active Volcanoes of Chiapas (Mexico): El Chichón and Tacaná by Teresa Scolamacchia, José Luis Macías

By Teresa Scolamacchia, José Luis Macías

This book summarizes the reports performed 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 gentle phreatic explosions in 1950 and 1986. purely after those explosions a surge of recent experiences started to unreveal their volcanic background and impression.
This booklet provides the state-of-the-art advances in issues concerning the geologic atmosphere of the 2 volcanoes, their eruptive heritage and composition of erupted items, the hydrothermal structures and their manifestations. Volcanic dangers and hazards and attainable mitigation plans are mentioned in response to the event of the catastrophic eruption of El Chichón that happened in 1982. The ebook also will comprise formerly unpublished fabric at the plants and the fauna of the quarter and archaeological and social facets of the realm that's inhabited through indigenous people.

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The common occurrence of amphibole would represent the evidence that Tacaná magmas, like those at El Chichón, were water-rich. As occurs at El Chichón, the relatively enriched Sr and Nd isotope ratios (Fig. 5) and evolution to high K2O/P2O5 (Fig. 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).

2011) (Fig. 9), which could have provided abundant hydrothermal sulfides to the mantle wedge (Arce et al. 2014). The high contents in Ti (>1 wt%) in the magmas of Central American volcanoes have been attributed to melting due to decompression of an asthenospheric mantle (Bolge et al. 2009). This concept could be applied also for El Chichón magmatism, where extensional tectonism has been documented (García-Palomo et al. 2004; Chap. 1). A Cocos-related origin for magmatism at El Chichón is under discussion, considering a truncation of the Cocos Plate at a depth of 100 km by the subducted Yucatán Plate suggested recently by Kim et al.

7050 86 Sr/ Sr Tacaná (volcano), Las Ardillas (dome), and San Antonio (volcano). Each group consisting of lavas and pyroclastic deposits, and mafic enclaves found into lava flows (Mora et al. 2004). e. e. La Vega Pyroclastic flow (LVPF), Sibinal Pumice (SP), and Tacaná Pumice (Arce et al. 2012; Chap. e. Chichuj, Tacaná, San Antonio volcanic structures) are unknown. All of TVC rocks display a porphyritic texture, sometimes with seriate and glomeroporphyritic textures (Fig. 6) with crystallinity around 32 vol% (Macías et al.

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