Late Archean Cu-Au-Mo mineralization at Gameleira and Serra Verde, Carajàs Mineral Province, Brazil: Constraints from Re-Os molybdenite ages

Robert Marschik, Ryan Mathur, Joaquin Ruiz, Richard A. Leveille, Antonio José de Almeida

Research output: Contribution to journalArticle

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Abstract

New Re-Os molybdenite ages provide constraints on the timing of Late Archean Cu-Au-Mo mineralization in the northern Carajás Mineral Province. Molybdenite from the Gameleira iron oxide Cu-Au-Mo deposit yielded an age of 2,614±14 Ma. This age overlaps within its analytical error with Re-Os ages of molybdenite from the Serra Verde Cu-Au-Mo vein deposit (2,609±13 Ma) and from the nearby small Garimpo Fernando gold mining operation (2,592±13 and 2,602±13 Ma), which is probably related to the latter. The geochronological data imply that the hydrothermal Cu-Au-Mo mineralization in these three deposits was epigenetic and coincides with a regional tectonic regime changing from dextral transtension and clastic sedimentation at 2.7-2.6 Ga to sinistral transpression and inversion at 2.6 Ga. Previously reported stable isotope and microthermometric data are compatible with a magmatic affiliation of the Cu-Au-Mo ores at Gameleira and Serra Verde. A genetic relationship of mineralization may therefore exist with 2.56-2.76 Ga Archean alkaline granitoids or with 2.6-2.7 calc-alkaline to tholeiitic volcanic-arc type magmatism.

Original languageEnglish (US)
Pages (from-to)983-991
Number of pages9
JournalMineralium Deposita
Volume39
Issue number8
DOIs
StatePublished - Mar 1 2005

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology
  • Economic Geology

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