TY - JOUR
T1 - Late Archean Cu-Au-Mo mineralization at Gameleira and Serra Verde, Carajàs Mineral Province, Brazil
T2 - Constraints from Re-Os molybdenite ages
AU - Marschik, Robert
AU - Mathur, Ryan
AU - Ruiz, Joaquin
AU - Leveille, Richard A.
AU - de Almeida, Antonio José
N1 - Funding Information:
Acknowledgements We thank DOCEGEO/CVRD and the owners of Serra Verde mine, and Garimpo Fernando for access to their properties and the samples. We particularly wish to thank L. Sa-boia, Mr. Murano, S. Guedes, and Mr. Muraia for their assistance. Thanks are also due to Phelps Dodge do Brasil Minerac¸ ão Ltda. for the logistic support. Funding by the Deutsche Forschungs-gemeinschaft for R. Marschik is gratefully acknowledged. This paper benefited greatly from constructive comments and suggestions by B. Lehmann, F. Tornos, and an anonymous reviewer.
PY - 2005/3
Y1 - 2005/3
N2 - 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.
AB - 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.
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U2 - 10.1007/s00126-004-0450-z
DO - 10.1007/s00126-004-0450-z
M3 - Article
AN - SCOPUS:15344341580
SN - 0026-4598
VL - 39
SP - 983
EP - 991
JO - Mineralium Deposita
JF - Mineralium Deposita
IS - 8
ER -