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| Michoacán–Guanajuato volcanic field | |
|---|---|
| Name | Michoacán–Guanajuato volcanic field |
| Photo caption | Parícutin eruption (1943) |
| Location | Michoacán, Guanajuato, Mexico |
| Type | Volcanic field |
| Last eruption | 1943–1952 (Parícutin) |
| Notable | Parícutin, Jorullo, Los Humeros |
Michoacán–Guanajuato volcanic field is a large monogenetic volcanic field in central Mexico spanning parts of Michoacán and Guanajuato states, characterized by hundreds of cinder cones, shield volcanoes, and basaltic lava flows. It lies within the Trans-Mexican Volcanic Belt and has produced historically observed eruptions including the well-documented 1943–1952 Parícutin event; the field influences regional landscapes, groundwater, and human settlements across the Bajío and the Purépecha Plateau.
The volcanic field occupies a segment of the Trans-Mexican Volcanic Belt near the border of Michoacán and Guanajuato, extending toward the Balsas River basin and the Sierra de Achichilco. It sits west of the active stratovolcano Popocatépetl and east of the Jalisco Block, overlain by Neogene and Quaternary sediments associated with the Mexican Volcanic Arc. Tectonically, the field is related to subduction of the Cocos Plate beneath the North American Plate and interactions with the Mesoamerican Trench and the regional crustal structures such as the Colima Rift and the Sierra Madre del Sur. Volcanological mapping by institutions like the Geological Survey of Mexico and university groups from the National Autonomous University of Mexico indicates monogenetic vent alignments controlled by regional faults and fractures associated with the Apatzingán Fault system and crustal unloading related to Neogene extension.
The field contains over 1,400 volcanic centers including the classic cinder cone Parícutin near the town of San Juan Parangaricutiro, the 18th-century Jorullo cone described by the priest José Antonio Alzate, and numerous shield volcanoes and maar craters studied by researchers at the Universidad Nacional Autónoma de México and the Mexican Institute of Petroleum. Lava flows form extensive pahoehoe and ʻaʻā fields that interact with drainage systems feeding the Río Lerma and irrigated valleys near León, Guanajuato and Morelia, Michoacán. Geomorphologists have identified tephra rings, lava tubes, scoria deposits, and pyroclastic veneers that preserve eruption sequences used by teams from the Smithsonian Institution and the International Association of Volcanology and Chemistry of the Earth's Interior for regional hazard models.
Eruptive activity spans the late Pliocene to Holocene with episodic volcanism; radiometric dating by laboratories at the Universidad de Guadalajara and the Institute of Geophysics, UNAM places many vents within the last 1.5 million years and a cluster of Holocene cones younger than 10,000 years. The 1943 birth and 1952 quiescence of Parícutin was documented by contemporaries including William F. Foshag and observers from the Geological Society of America and remains a type example of monogenetic behavior. Historical records and archaeological correlations with Purépecha settlement layers link older eruptions such as Jorullo (1759) to social impacts recorded by colonial authorities in New Spain and parish registries archived in Morelia Cathedral and regional municipal archives.
Lavas are predominantly basaltic to basaltic-andesitic, with petrogenesis studies by the Institute of Geophysics, UNAM and international teams indicating mantle-derived magmas modified by variable degrees of crustal assimilation and fractional crystallization. Geochemical signatures show enriched mid-ocean ridge basalt (E-MORB)-like and ocean island basalt (OIB)-like affinities influenced by melts from dehydrated portions of the Cocos Plate slab and small-scale mantle heterogeneities sampled beneath the Trans-Mexican Volcanic Belt. Isotopic work involving strontium, neodymium, and lead ratios conducted at the University of Cambridge and the University of Tokyo supports mixed mantle sources and localized crustal contamination controlled by fault conduits.
Although not dominated by large calderas like Los Humeros or Las Cumbres, several areas within the field show elevated geothermal gradients exploited by prospecting teams from the Mexican Federal Electricity Commission and energy firms investigating hydrothermal reservoirs. Volcanic hazards include lava flows, tephra fall, gas emissions, and ground deformation; historic impacts include burial of farmland and displacement recorded during the Parícutin eruption, and ongoing risks affect communities in the Bajío agricultural zone and transportation corridors connecting Mexico City and Guadalajara. Monitoring by the National Center for Disaster Prevention (CENAPRED) and seismic networks of the Seismological Service of Mexico focuses on vent formation, gas fluxes, and earthquake swarms linked to magmatic intrusions.
Volcanic soils derived from basaltic tephra and pyroclastics support fertile agricultural lands cultivated for maize and agave near Uruapan and Zamora, with irrigation networks tied to the Río Lerma–Santiago basin and regional water management agencies. Ecologists from the National Institute of Ecology and Climate Change document successional vegetation on recent flows including pines and oaks of the Trans-Mexican Volcanic Belt pine–oak forests ecoregion, while conservation groups such as Comisión Nacional para el Conocimiento y Uso de la Biodiversidad study endemic flora on isolated cones. Land use pressures from urban expansion around León, pasture conversion, and quarrying for scoria present management challenges for local municipalities and federal agencies.
The field is culturally prominent through the Parícutin story immortalized in works by artists like Diego Rivera and chronicled by writers in El País and regional archives; the eruption influenced Purépecha oral histories and colonial parish records preserved in Pátzcuaro. Tourism centered on volcanic landmarks attracts visitors from Mexico City, Guadalajara, and international scientific delegations from institutions such as the Smithsonian Institution and the Royal Society. Economic effects include fertile soils supporting the agave industry, hazards-driven resettlement policies administered by municipal governments, and an enduring scientific legacy through collaborations involving the Geological Society of America, UNAM, and regional research institutes.
Category:Volcanic fields of Mexico Category:Geography of Michoacán Category:Geography of Guanajuato