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The eruptive history of the Tequila volcanic field, western Mexico: ages, volumes, and relative proportions of lava types

dc.contributor.authorDelgado-Granados, Hugoen_US
dc.contributor.authorLange, Rebecca A.en_US
dc.contributor.authorLewis-Kenedi, Catherine B.en_US
dc.contributor.authorHall, Chris M.en_US
dc.date.accessioned2006-09-11T19:24:55Z
dc.date.available2006-09-11T19:24:55Z
dc.date.issued2005-06en_US
dc.identifier.citationLewis-Kenedi, Catherine B.; Lange, Rebecca A.; Hall, Chris M.; Delgado-Granados, Hugo; (2005). "The eruptive history of the Tequila volcanic field, western Mexico: ages, volumes, and relative proportions of lava types." Bulletin of Volcanology 67(5): 391-414. <http://hdl.handle.net/2027.42/47807>en_US
dc.identifier.issn1432-0819en_US
dc.identifier.issn0258-8900en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/47807
dc.description.abstractThe eruptive history of the Tequila volcanic field (1600 km 2 ) in the western Trans-Mexican Volcanic Belt is based on 40 Ar/ 39 Ar chronology and volume estimates for eruptive units younger than 1 Ma. Ages are reported for 49 volcanic units, including Volcán Tequila (an andesitic stratovolcano) and peripheral domes, flows, and scoria cones. Volumes of volcanic units ≤1 Ma were obtained with the aid of field mapping, ortho aerial photographs, digital elevation models (DEMs), and ArcGIS software. Between 1120 and 200 kyrs ago, a bimodal distribution of rhyolite (~35 km 3 ) and high-Ti basalt (~39 km 3 ) dominated the volcanic field. Between 685 and 225 kyrs ago, less than 3 km 3 of andesite and dacite erupted from more than 15 isolated vents; these lavas are crystal-poor and show little evidence of storage in an upper crustal chamber. Approximately 200 kyr ago, ~31 km 3 of andesite erupted to form the stratocone of Volcán Tequila. The phenocryst assemblage of these lavas suggests storage within a chamber at ~2–3 km depth. After a hiatus of ~110 kyrs, ~15 km 3 of andesite erupted along the W and SE flanks of Volcán Tequila at ~90 ka, most likely from a second, discrete magma chamber located at ~5–6 km depth. The youngest volcanic feature (~60 ka) is the small andesitic volcano Cerro Tomasillo (~2 km 3 ). Over the last 1 Myr, a total of 128±22 km 3 of lava erupted in the Tequila volcanic field, leading to an average eruption rate of ~0.13 km 3 /kyr. This volume erupted over ~1600 km 2 , leading to an average lava accumulation rate of ~8 cm/kyr. The relative proportions of lava types are ~22–43% basalt, ~0.4–1% basaltic andesite, ~29–54% andesite, ~2–3% dacite, and ~18–40% rhyolite. On the basis of eruptive sequence, proportions of lava types, phenocryst assemblages, textures, and chemical composition, the lavas do not reflect the differentiation of a single (or only a few) parental liquids in a long-lived magma chamber. The rhyolites are geochemically diverse and were likely formed by episodic partial melting of upper crustal rocks in response to emplacement of basalts. There are no examples of mingled rhyolitic and basaltic magmas. Whatever mechanism is invoked to explain the generation of andesite at the Tequila volcanic field, it must be consistent with a dominantly bimodal distribution of high-Ti basalt and rhyolite for an 800 kyr interval beginning ~1 Ma, which abruptly switched to punctuated bursts of predominantly andesitic volcanism over the last 200 kyrs.en_US
dc.format.extent695874 bytes
dc.format.extent3115 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherSpringer-Verlagen_US
dc.subject.otherTrans-Mexican Volcanic Belten_US
dc.subject.otherArc Volcanismen_US
dc.subject.otherEruption Ratesen_US
dc.subject.otherGISen_US
dc.subject.other40 Ar/ 39 Ar Geochronologyen_US
dc.subject.otherAphyric Andesitesen_US
dc.titleThe eruptive history of the Tequila volcanic field, western Mexico: ages, volumes, and relative proportions of lava typesen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelGeology and Earth Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Geological Sciences, University of Michigan, Ann Arbor, MI, 48109–1063, USAen_US
dc.contributor.affiliationumDepartment of Geological Sciences, University of Michigan, Ann Arbor, MI, 48109–1063, USAen_US
dc.contributor.affiliationumDepartment of Geological Sciences, University of Michigan, Ann Arbor, MI, 48109–1063, USAen_US
dc.contributor.affiliationotherInstituto de Geofísica, UNAM, 04510 DF, Coyoacan, Mexicoen_US
dc.contributor.affiliationumcampusAnn Arboren_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/47807/1/445_2004_Article_377.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1007/s00445-004-0377-3en_US
dc.identifier.sourceBulletin of Volcanologyen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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