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New Sr-Nd-Pb-O isotope data for Colima volcano and evidence for the nature of the local basement

By
Gabriel Valdez-Moreno
Gabriel Valdez-Moreno
Posgrado en Ciencias de la Tierra, Instituto de Geofísica, Universidad Nacional Autónoma de México (UNAM), México D.F., México
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Peter Schaaf
Peter Schaaf
Laboratorio Universitario de Geoquímica Isotópica (LUGIS), Instituto de Geofísica and Instituto de Universidad Nacional Autónoma de México (UNAM), México D.F., México
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José Luis Macías
José Luis Macías
Departamento de Vulcanología, Instituto de Geofísica, Universidad Nacional Autónoma de México (UNAM), México D.F., México
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Minoru Kusakabe
Minoru Kusakabe
Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottoriken 682-0193, Japan
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Published:
January 01, 2006

Colima volcano is situated at the western edge of the Mexican volcanic belt within the Colima rift zone. This contribution presents new geochemical and Sr-Nd-Pb-O isotope data for Colima volcano rocks and plutonic xenoliths found in prehistorical lava flows. Colima volcano magmas display strong subduction signatures (positive peaks of Ba, K, Pb, and Sr, and negative anomalies of Nb and Ti) and were generated in a depleted mantle source and emplaced at crustal levels (garnet-free zone), where they experienced fractional crystallization of plagioclase and pyroxene. Gabbroic and granitoid xenoliths found in prehistorical lava flows show evidence for partial melting and are considered to be representative of the basement beneath Colima volcano. At upper-crustal levels, Colima volcano magmas were contaminated by granitoids, like those of the nearby Cretaceous Manzanillo and Jilotlán Batholiths. Sr-Nd isotope ratios of these intrusives are nearly identical to those of Colima volcano lavas. For that reason assimilation of the granitic crust is not detectable in diagrams of these isotopic systems but can be clearly seen in a ϵNd versus δ18O plot. In comparison to other large Mexican volcanic belt stratovolcanoes, Colima volcano lavas display the least evolved geochemical and isotopic signatures of this arc.

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GSA Special Papers

Neogene-Quaternary Continental Margin Volcanism: A perspective from Me´xico

Claus Siebe
Claus Siebe
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José Luis MacíasGerardo
José Luis MacíasGerardo
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J. Aguirre-Díaz
J. Aguirre-Díaz
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Geological Society of America
Volume
402
ISBN print:
9780813724027
Publication date:
January 01, 2006

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