World-class Archaean gold deposits in Canada: An overview
Titel:
World-class Archaean gold deposits in Canada: An overview
Auteur:
Robert, F. Poulsen, K. H.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 44 (1997) nr. 3 pagina's 329-351
Jaar:
1997-06
Inhoud:
The Archaean Superior and Slave Cratons in Canada contain 14 'world-class' gold deposits (i.e. > 100 t Au). Most of these occur in greenstone belts, in spatial association with major fault zones, and a few in turbidite sedimentary sequences. These deposits display a significant diversity of geological attributes and timing relations with other geological events. The different styles of deposits include: quartz-carbonate veins related to shear zones and folds (Dome, Pamour, Hollinger-McIntyre, Kerr Addison, Kirkland Lake, Sigma-Lamaque, Con-Giant, parts of Lupin); zones of disseminated sulfides ± stockworks around porphyry bodies (Hemlo, Malartic); massive sulfide lenses (Home, Bousquet 2, parts of Lupin), sulfide-rich veins, stockworks and disseminated sulfides (Doyon, Bousquet 1); and carbonate ± quartz veins (Campbell-A.W. White). Such diversity requires that Canadian Archaean world-class gold deposits be of multiple geological and genetic types. Three broad categories of models considered to be applicable include the following deposit types: synvolcanic deposits of exhalative, sub-sea-floor replacement or shallow-marine epithermal origins; intrusion-related deposits as proposed for young arc settings; and syntectonic 'mesothermal' vein deposits. An important consequence is that multiple sets of exploration criteria derived from these different models is required in support of future exploration strategies.
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