Late Archean Cu-Au-Mo mineralization at Gameleira and Serra Verde, Carajàs Mineral Province, Brazil: constraints from Re-Os molybdenite ages |
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| Authors: | Robert Marschik Ryan Mathur Joaquin Ruiz Richard A Leveille Antonio-José de Almeida |
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| Institution: | (1) Department of Earth and Enviromental Sciences, University of Munich, Luisenstrasse 37, 80333 Munich, Germany;(2) Department of Geology, Juniata College, Huntingdon, PA 16652, USA;(3) Department of Earth Sciences, University of Arizona, Tucson, AZ 85721, USA;(4) Phelps Dodge Exploration Corporation, One North Central Avenue, Phoenix, AZ 85004, USA;(5) Phelps Dodge do Brasil Mineração Ltda., Rua Voluntários da Pátria, 45 salas 403/404, Botafogo, Rio de Janeiro, Brazil |
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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.Editorial handling: F. Tornos |
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| Keywords: | Re-Os Molybdenite Gameleira Pojuca Serra Verde Carajá s Archean Iron oxide Cu-Au deposits |
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