U-Pb zircon and Re-Os molybdenite geochronology from La Caridad porphyry copper deposit: Insights for the duration of magmatism and mineralization in the Nacozari District, Sonora, Mexico

Victor A. Valencia, Joaquin Ruiz, F. Barra, G. Geherls, Mihai N Ducea, S. R. Titley, L. Ochoa-Landin

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Uranium-lead zircon (laser ablation multi-collector ICP-MS spot analysis) ages from La Caridad porphyry copper deposit in the Nacozari District, Northeastern Sonora, Mexico, suggest a short period of magmatism, between 55.5 and 52.6 Ma. Two U-Pb ages from the mineralized quartz monzonite unit, showing different textural characteristics, yielded indistinguishable crystallization ages (∼54 Ma), and indicate that the intrusion responsible for the mineralization occurred as a single large complex unit, instead of multiple pulses of magmatism. Some zircons analyzed also show inherited ages in cores recording dates of 112-124 Ma, 141-166 Ma and 1.4 Ga. The Re-Os molybdenite ages from the potassic and phyllic hydrothermal alteration veins yielded identical ages within error, 53.6 ±0.3 Ma and 53.8±0.3 Ma, respectively (weighted average of 53.7 ±0.21 Ma), supporting a restricted period for the mineralization. The geochronological data thus indicate a short-lived magmatic and hydrothermal system. The inherited zircons of Precambrian and Late Jurassic-Mid Cretaceous age found in the intrusive rocks of La Caridad deposit, can be explained considering two possible scenarios within the tectonic/magmatic evolution of the area. The first scenario considers the presence of a Precambrian anorogenic granitic basement that is intruded by Mesozoic (Jurassic-Cretaceous) units present beneath the La Caridad deposit. The second scenario suggests that the Mesozoic Glance Conglomerate Formation of Arizona underlies the Paleocene volcanic-igneous pile in the La Caridad area.

Original languageEnglish (US)
Pages (from-to)175-191
Number of pages17
JournalMineralium Deposita
Volume40
Issue number2
DOIs
StatePublished - Mar 2005

Fingerprint

Geochronology
Copper deposits
geochronology
molybdenite
Mexico
porphyry
magmatism
zircon
deposits
mineralization
copper
Deposits
Quartz
Uranium
hydrothermal systems
inductively coupled plasma mass spectrometry
Laser ablation
Tectonics
piles
Crystallization

Keywords

  • La Caridad
  • Mexico
  • Porphyry Cu
  • Re-Os
  • Sonora
  • U-Pb

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

U-Pb zircon and Re-Os molybdenite geochronology from La Caridad porphyry copper deposit : Insights for the duration of magmatism and mineralization in the Nacozari District, Sonora, Mexico. / Valencia, Victor A.; Ruiz, Joaquin; Barra, F.; Geherls, G.; Ducea, Mihai N; Titley, S. R.; Ochoa-Landin, L.

In: Mineralium Deposita, Vol. 40, No. 2, 03.2005, p. 175-191.

Research output: Contribution to journalArticle

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abstract = "Uranium-lead zircon (laser ablation multi-collector ICP-MS spot analysis) ages from La Caridad porphyry copper deposit in the Nacozari District, Northeastern Sonora, Mexico, suggest a short period of magmatism, between 55.5 and 52.6 Ma. Two U-Pb ages from the mineralized quartz monzonite unit, showing different textural characteristics, yielded indistinguishable crystallization ages (∼54 Ma), and indicate that the intrusion responsible for the mineralization occurred as a single large complex unit, instead of multiple pulses of magmatism. Some zircons analyzed also show inherited ages in cores recording dates of 112-124 Ma, 141-166 Ma and 1.4 Ga. The Re-Os molybdenite ages from the potassic and phyllic hydrothermal alteration veins yielded identical ages within error, 53.6 ±0.3 Ma and 53.8±0.3 Ma, respectively (weighted average of 53.7 ±0.21 Ma), supporting a restricted period for the mineralization. The geochronological data thus indicate a short-lived magmatic and hydrothermal system. The inherited zircons of Precambrian and Late Jurassic-Mid Cretaceous age found in the intrusive rocks of La Caridad deposit, can be explained considering two possible scenarios within the tectonic/magmatic evolution of the area. The first scenario considers the presence of a Precambrian anorogenic granitic basement that is intruded by Mesozoic (Jurassic-Cretaceous) units present beneath the La Caridad deposit. The second scenario suggests that the Mesozoic Glance Conglomerate Formation of Arizona underlies the Paleocene volcanic-igneous pile in the La Caridad area.",
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