Re-Os molybdenite and LA-ICPMS-MC U-Pb zircon geochronology for the Milpillas porphyry copper deposit: insights for the timing of mineralization in the Cananea District, Sonora, Mexico
Vol. 23 No. 1 (2006), Regular Papers
Vol. 23 No. 1 (2006)

Re-Os molybdenite and LA-ICPMS-MC U-Pb zircon geochronology for the Milpillas porphyry copper deposit: insights for the timing of mineralization in the Cananea District, Sonora, Mexico

Regular Papers
Published 2018-02-26
Víctor A. Valencia
Department of Geosciences, University of Arizona, Gould-Simpson Building 1040 East Fourth St., Tucson, Arizona 85721-0077.
Benito Noguez-Alcántara
Servicios Industriales Peñoles, Blvd. Navarrete 2778, 83200, Hermosillo, Sonora. 3 Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apartado Postal 1039, 83000 Hermosillo Sonora, Mexico.
Fernando Barra
Department of Geosciences, University of Arizona, Gould-Simpson Building 1040 East Fourth St., Tucson, Arizona 85721-0077. Instituto de Geología Económica Aplicada, Universidad de Concepción, Chile.
Joaquín Ruiz
Department of Geosciences, University of Arizona, Gould-Simpson Building 1040 East Fourth St., Tucson, Arizona 85721-0077.
George Gehrels
Department of Geosciences, University of Arizona, Gould-Simpson Building 1040 East Fourth St., Tucson, Arizona 85721-0077.
Francisco Quintanar
Servicios Industriales Peñoles, Blvd. Navarrete 2778, 83200, Hermosillo, Sonora.
Martín Valencia-Moreno
Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apartado Postal 1039, 83000 Hermosillo Sonora, Mexico.
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Keywords

U-Pb, Re-Os, geochronology, porphyry copper deposit, Laramide magmatism, Milpillas, Cananea, Mexico.
U-Pb, Re-Os, geocronología, pórfido cuprífero, magmatismo Laramide, Milpillas, Cananea, México.

How to Cite

Valencia, V. A., Noguez-Alcántara, B., Barra, F., Ruiz, J., Gehrels, G., Quintanar, F., & Valencia-Moreno, M. (2018). Re-Os molybdenite and LA-ICPMS-MC U-Pb zircon geochronology for the Milpillas porphyry copper deposit: insights for the timing of mineralization in the Cananea District, Sonora, Mexico. Revista Mexicana De Ciencias Geológicas, 23(1), 39–53. Retrieved from https://rmcg.unam.mx/index.php/rmcg/article/view/766
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Abstract

New geochronological data presented here improves the understanding of the temporal evolution of the Cananea Mining District, and particularly of the Milpillas porphyry copper deposit (northeastern Sonora, Mexico). Uranium-lead zircon analyses, using laser ablation ICP-MS multi-collector, from the quartz monzonite porphyry unit that host the mineralization at the Milpillas deposit, yielded a crystallization age of 63.9 ± 1.3 Ma (2-sigma). Re-Os molybdenite ages from two drill core samples from more than 500 m depth yielded an identical age of 63.1 ± 0.4 Ma (2-sigma), suggesting a restricted period of mineralization. These ages indicate that the Milpillas deposit is the oldest Laramide porphyry copper deposit recognized so far in the Cananea District.
Our new Re-Os data in addition to previous Re-Os data, suggest that mineralization within the district, occurred within a ~4 m.y. period in three discrete pulses at ~59 Ma, ~61 Ma and ~63 Ma. This is in contrast to the previous model in which mineralization at the Cananea District was the result of a continuous hydrothermal system that started at ~62 Ma and ended at ~52 Ma.

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