This ebook summarizes the experiences 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 light phreatic explosions in 1950 and 1986. simply after those explosions a surge of recent reports started to unreveal their volcanic heritage and influence.
This publication provides the cutting-edge advances in themes regarding the geologic surroundings 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 The publication also will contain formerly unpublished fabric at the plant life and the fauna of the sector and archaeological and social points of the world that's inhabited by means of indigenous humans.
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Extra resources for Active Volcanoes of Chiapas (Mexico): El Chichón and Tacaná (Active Volcanoes of the World)
Rose et al. (1984) analyzed undeﬁned lava dome and pyroclastic flow deposits, outcropping inside the inner 1982 crater walls, consisting of porphyritic trachyandesites, with a crystallinity ranging from 20 to 40 vol% (Rose et al. 1984). Pumice samples of the 1982 eruption (unit A, see Chap. 3) are also porphyritic and vesicular, with crystallinity between 19 and 29 vol% (Luhr et al. 3– 4 mm) phenocrysts of plagioclase and amphibole. Pumice samples from the fallout deposit of Unit B (Chap. 3) show a porphyritic texture (Fig.
6). These authors included some general petrographic descriptions and whole-rock chemical analysis of Las Ardillas dome. More recent studies are those published by Macías et al. (2010b) who studied a debris avalanche deposit and its petrographic and geochemical characteristics, and Arce et al. (2012) who studied the eruptive dynamics and the petrology of the Sibinal Pumice deposit, produced by a Plinian eruption around 23, 540 year BP (see Chap. 6). 5130 Pre-Quaternary Nicaragua La Providencia Talamancas Panama To w ar Nd/ Nd ds (D Chichón SD 144 Fig.
2014) later, a more robust geochemical data for Unit B demonstrated that Sr/Y ratios are around 50 (Macías et al. 2003), that correspond to mantle melts. An alternative explanation for the genesis of El Chichón magmas rich in potassium, sulfur, and phosphorous, could be considering such melts as the product of a “rifting” mechanism combined with melting or dehydration of the Yucatan slab (Arce et al. 2014). The Yucatan slab is an oceanic plate dipping to the SW, subducted during the Miocene (Kim et al.