Eruptive chronology of monogenetic volcanoes northwestern of Morelia – Insights into volcano-tectonic interactions in the central-eastern Michoacán-Guanajuato Volcanic Field, México
Por:
Avellán D.-R., Cisneros-Maximo, Guillermo, Macías J.L., Gómez-Vasconcelos M.G., Layer, Paul W., Sosa-Ceballos, Giovanni, Robles-Camacho, Jasinto
Publicada:
1 ene 2020
Resumen:
Twelve monogenetic volcanoes formed during the last 7 Ma within the Tarímbaro graben, northwest of the city of Morelia, in the central-eastern part of the Michoacán-Guanajuato volcanic field (México). These include four scoria cones (Pelón, Tetillas, Jamanal, and Parastaco), four lava domes (La Cruz, Divisadero, Estadio, and Tetillas), two small shield volcanoes (Quinceo and Tetillas) and two lava flows (Cuto and Cerritos). Based on a detailed geological map and stratigraphy aided by new 40Ar/39Ar and 14C radiometric dates, and whole-rock chemical analyses, we established the eruptive chronology of these monogenetic volcanoes. These volcanoes were built upon four early Miocene successions of regional volcanism named Cuitzeo lavas (18.7 Ma), Cuitzeo ignimbrite (17.4 Ma), Atécuaro ignimbrite (16.8 Ma), and Punhuato lavas (16.3 Ma). Late Miocene to Pliocene activity consisted of the La Cruz, Divisadero, and Estadio domes and the Cuto lava flow (6.7–3.1 Ma). Pleistocene activity included the Cuitzeo fallout pyroclastic sequence (1.48 Ma), the Quinceo small shield volcano (1.36 Ma), the Pelón scoria cone (0.84 Ma), the Tetillas small shield volcano, two lava domes and a scoria cone (0.56–0.34 Ma), the Jamanal and Parastaco scoria cones and the Cerritos lava flow (0.11 Ma). Magma volumes from these volcanoes vary from <0.1 to 4 km3. We ascribe their variety of magma volumes, morphology, volcanic styles, and spatio-temporal distribution to tectonic changes and evolution of the ENE Tarímbaro graben, whose faults belong to the Tarímbaro-Álvaro Obregón fault segment in the central part of the Morelia-Acambay Fault System. Quinceo (2 km3) and Tetillas (4 km3) small shield volcanoes are by far the most voluminous centers dominating the landscape of the city of Morelia. All rock samples have compositions varying from 49.3 to 61.6 wt % in silica with medium-K contents (0.43–1.83 wt %). © 2020 Elsevier Ltd
Filiaciones:
CONACYT- Instituto de Geofísica, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán 58190, Mexico
Instituto de Geofísica, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán 58190, Mexico
CONACYT-Instituto de Investigaciones en Ciencias de la Tierra, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
College of Natural Science, Mathematics and Geophysical Institute, University of Alaska, Fairbanks, Fairbanks, AK 99775, United States
Instituto Nacional de Antropología e Historia (INAH), Laboratorio de Arqueometría del Occidente, Centro INAH Michoacán, Centro, Av. Madero oriente 369, Morelia, Michoacán 58000, Mexico
Univ Nacl Autonoma Mexico, CONACYT Inst Geofis, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Univ Nacl Autonoma Mexico, Inst Geofis, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Univ Michoacana, CONACyT Inst Invest Ciencias Tierra, Morelia, Michoacan, Mexico
Univ Alaska, Coll Nat Sci, Math & Geophys Inst, Fairbanks, AK 99775 USA
Ctr INAH Michoacan, Inst Nacl Antropol & Hist INAH, Lab Arqueometria Occidente, Av Madero Oriente 369, Morelia 58000, Michoacan, Mexico
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