Geologic evolution of the Donguinyó-Huichapan caldera complex,central Mexican Volcanic Belt,Mexico |
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| Authors: | Gerardo J Aguirre-Díaz Margarita López-Martínez |
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| Institution: | 1. Far East Geological Institute, Far Eastern Branch of the Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, Vladivostok, 690022, Russia;2. Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, ul. Nauki 5, Yuzhno-Sakhalinsk, 693022, Russia;3. Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology Yokosuka, 237 0061, Japan;1. Centro de Geociencias, Universidad Nacional Autónoma de México, Querétaro 76230, Mexico;2. Facultad de Ingeniería, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico;3. Lamont Doherty Earth Observatory of Columbia University, Palisades, NY 10964, USA;1. Departamento de Geología Regional, Instituto de Geología, Universidad Nacional Autónoma de México, Coyoacán, 04510 Ciudad de México, Mexico;2. Instituto de Geofísica, Universidad Nacional Autónoma de Mexico, Antigua Carretera a Pátzcuaro 8701, 58190 Morelia, Michoacán, Mexico;3. Instituto de Investigaciones en Ciencias de la Tierra, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico;4. Instituto Politécnico Nacional-CIIEMAD, Calle 30 de junio de 1520 s/n, Barrio La Laguna Ticomán, Gustavo A. Madero, 07340 Ciudad de, Mexico, Mexico;5. College of Natural Science and Mathematics and Geophysical Institute, University of Alaska at Fairbanks, Fairbanks, AK 99775, United States;6. Instituto de Ingeniería, Universidad Nacional Autónoma de México, Coyoacán, 04510, Ciudad de México, Mexico |
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| Abstract: | The Donguinyó-Huichapan caldera complex is located 110 km to the NNW of Mexico City, in the central sector of the Mexican Volcanic Belt. It is a 10 km in diameter complex apparently with two overlapping calderas, each one related to an ignimbrite sequence that contrasts in composition, mineralogy, welding, distribution, and physical aspect. The geologic evolution of this complex includes the following phases, 1) A first caldera formed at 5.0 ± 0.3 Ma, with the eruption of several discrete pulses of andesitic to trachydacitic pyroclastic flows that produced a series of densely welded ignimbrites; 2) At 4.6 ± 0.3 Ma, several small shield volcanoes and cinder cones built the rim of this caldera and erupted basaltic-andesite and andesitic lava flows; 3) At 4.2 ± 0.2 Ma, a second caldera was formed associated to the eruption of the Huichapan Tuff, which is a rhyolitic pyroclastic sequence consisting of minor unwelded ignimbrites, pumice fall and surge deposits, and a voluminous welded ignimbrite; 4) Also yielding an age of 4.2 ± 0.2 Ma, several trachydacitic lava domes were extruded along the new ring fracture and formed the rim of the Huichapan caldera, as well as five intra-caldera domes of dacitic and trachydacitic composition. Peripheral volcanism includes a large 2.5 ± 0.1 Ma shield volcano that was emplaced on the Huichapan caldera rim.The two calderas that form the Donguinyó-Huichapan complex have contrasting differences in volcanic styles that were apparently due to their differences in composition. Products erupted by the Donguinyó caldera are basaltic-andesite to trachydacitic in composition, whereas Huichapan caldera products are all high-silica rhyolites. |
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