Mineralium Deposita

, Volume 48, Issue 7, pp 883–905

Multistage gold mineralization at the Lapa mine, Abitibi Subprovince: insights into auriferous hydrothermal and metasomatic processes in the Cadillac–Larder Lake Fault Zone

  • M. Simard
  • D. Gaboury
  • R. Daigneault
  • P. Mercier-Langevin
Article

Abstract

The Lapa gold deposit contains reserves of 2.4 Mt at 6.5 g/t Au and is one of the few deposits located directly within the Cadillac–Larder Lake Fault Zone (CLLFZ), a first-order crustal-scale fault that separates the Archean Abitibi Subprovince from the Pontiac Subprovince to the south. Gold mineralization is predominantly hosted in highly strained and altered, upper greenschist–lower amphibolite facies mafic to ultramafic rocks of the Piché Group. Auriferous ore zones consist of finely disseminated auriferous arsenopyrite–pyrrhotite ± pyrite and native gold disseminated in biotite- and carbonate-altered wall rocks. Native gold, which is also present in quartz ± dolomite–calcite veinlets, is locally associated with Sb-bearing minerals, especially at depth ≤1 km from surface where the deposit is characterized by a Au–Sb–As association. At vertical depth greater than 1 km, gold is associated with arsenopyrite and pyrrhotite (Au–As association). The mineralogy and paragenesis of the Lapa deposit metamorphosed ore and alteration assemblages record the superposition of three metamorphic episodes (M1, M2, and M3) and three gold mineralizing events. Spatial association between biotitized wall rocks and auriferous arsenopyrite indicates that arsenopyrite precipitation is concomitant with potassic alteration. The predominant Au–As association recognized across the deposit is related to gold in solid solution in arsenopyrite as part of a pre-M2 low-grade auriferous hydrothermal event. However, the occurrence of hornblende + oligoclase porphyroblasts overprinting the biotite alteration, and the presence of porous clusters and porphyroblasts of arsenopyrite with native gold and pyrrhotite indicate an auriferous metasomatic event associated with peak M2 prograde metamorphism. Late retrograde metamorphism (M3) overprints the hornblende–oligoclase M2 assemblage within the host rocks proximal to ore by an actinolite–albite assemblage by precipitation of free gold and Sb–sulfosalts at lower PT. The complex relationships between ore, structural features, and metamorphic assemblages at Lapa are related to the tectonometamorphic evolution of the Cadillac–Larder Lake Fault Zone at different times and crustal levels, and varying heat and fluid flow regimes. The Lapa deposit demonstrates that early, low-grade gold mineralization within the Cadillac–Larder Lake Fault Zone has benefited from late gold enrichment(s) during prograde and retrograde metamorphism, suggesting that multi-stage processes may be important to form gold-rich orogenic deposits in first order crustal-scale structures.

Keywords

Abitibi greenstone belt Vertical zoning Arsenopyrite Invisible gold Metasomatism Cadillac–Larder Lake Fault Zone 

Supplementary material

126_2013_466_MOESM1_ESM.doc (701 kb)
ESM 1Map of Level 80 (800 m depth) in a plane view and b cross-section. Local asymmetric folds along the Cadillac–Piché contact is shown in (a). (DOC 701 kb)
126_2013_466_MOESM2_ESM.doc (313 kb)
ESM 2Binary plots showing variations of metallic content vs. depth. a Antimony. b Gold. c Arsenic. Depth represents depth of the Lapa mine grid. (DOC 313 kb)
126_2013_466_MOESM3_ESM.doc (67 kb)
ESM 3Representative arsenopyrite composition from microprobe analysis (wt.%). (DOC 67 kb)
126_2013_466_MOESM4_ESM.doc (73 kb)
ESM 4Representative LA–ICP–MS analysis of arsenopyrite in the Lapa gold deposit (ppm). (DOC 73 kb)
126_2013_466_MOESM5_ESM.doc (87 kb)
ESM 5Representative amphibole compositions from electron microprobe analysis. (DOC 87 kb)
126_2013_466_MOESM6_ESM.doc (91 kb)
ESM 6Representative feldspar compositions from electron microprobe analysis. (DOC 91 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • M. Simard
    • 1
  • D. Gaboury
    • 2
  • R. Daigneault
    • 2
  • P. Mercier-Langevin
    • 3
  1. 1.Agnico-Eagle Mines Ltd—Division ExplorationVal d’OrCanada
  2. 2.Centres d’Études sur les Ressources MinéralesUniversité du Québec à ChicoutimiChicoutimiCanada
  3. 3.Geological Survey of CanadaQuebecCanada

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