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Late Cenozoic intraplate-type volcanism in central and northern Mexico; a review

Jose Jorge Aranda-Gomex, James F. Luhr, Todd B. Housh, Gabriel Valdez-Moreno and Gabriel Chavez-Cabello
Late Cenozoic intraplate-type volcanism in central and northern Mexico; a review (in Geology of Mexico; celebrating the centenary of the Geological Society of Mexico, Susana Alicia Alaniz-Alvarez (editor) and Angel Francisco Nieto-Samaniego (editor))
Special Paper - Geological Society of America (2007) 422: 93-128


Intraplate-type volcanism (late Oligocene to Quaternary) occurs in Mexico on both the North American and the Pacific plates. Oceanic localities are voluminous shield volcanoes on or near fossil-spreading ridges. Subaerial rocks of these volcanoes form either geochemically continuous and coherent rock series or bimodal suites. Low-pressure crystal fractionation of alkali basalt and assimilation of hydro-thermally altered rocks from the volcanic pile determined the compositions of the mafic-intermediate rocks at Socorro. Trachytes at Socorro were formed by partial melting of alkali basalt, and rhyolites through crystal fractionation of parental trachytes. These felsic rocks also assimilated hydrothermally altered rocks. Continental localities (late Oligocene to Quaternary) occur scattered north of the Trans-Mexican Volcanic Belt; their location is independent of older volcanic provinces and boundaries between today's geologic/tectonic provinces. Intraplate-type rocks have high TiO (sub 2) , Nb, and Ta contents, and host mantle and/or lower crust xenoliths+ or -megacrysts. Many fields are in the southern Basin and Range and the most extensive and voluminous were contemporaneous with normal faulting. The locations of some fields suggest that magma ascent was influenced by regional structures. However, normal faulting is minor or absent in many other Mexican fields. The petrogenetic processes in late Oligocene to Miocene magmas differ from those in Plio-Quaternary magmas. Slow ascent of magmas formed during early stages of extension-favored assimilation-fractional crystallization and gravitational settling of xenoliths. Plio-Quaternary xenolith-bearing magmas traveled faster through cooler crust where brittle structures caused by extension were able to propagate deeper. Geochemical evidence of assimilation is more subtle in the younger volcanic rocks.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 422
Title: Late Cenozoic intraplate-type volcanism in central and northern Mexico; a review
Title: Geology of Mexico; celebrating the centenary of the Geological Society of Mexico
Author(s): Aranda-Gomex, Jose JorgeLuhr, James F.Housh, Todd B.Valdez-Moreno, GabrielChavez-Cabello, Gabriel
Author(s): Alaniz-Alvarez, Susana Aliciaeditor
Author(s): Nieto-Samaniego, Angel Franciscoeditor
Affiliation: Instituto Potosino de Investigacion Cientifica y Tecnologica, Departamento de Geologia Economica, San Luis Potosi, Mexico
Affiliation: Universidad Nacional Autonoma de Mexico, Centro de Geociencias, Mexico City, Mexico
Pages: 93-128
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2422-5
References: 158
Accession Number: 2007-114030
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N14°30'00" - N32°43'00", W117°00'00" - W86°45'00"
Secondary Affiliation: Smithsonian Institution, National Museum of Natural History, Department of Mineral Sciences, USA, United StatesUniversity of Texas at Austin, USA, United StatesUniversidad Nacional Autonoma de Mexico, MEX, Mexico
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200747
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