Geology of Canadian Mineral Deposit Types
This volume defines and summarizes in a comprehensive and systematic manner the essential characteristics of all economically significant types of Canadian mineral deposits. These summaries reflect the current understanding of mineral deposits and correspond closely to the definition of mineral-deposit types in common use. A large color section serves to illustrate details of some of these mineral deposits, and locations of all known deposits are presented on an oversize figure and are indexed in an appendix, as well. Like previous volumes of this type, this volume will be a long-standing premier reference for academia, industry, and government institutions alike.
Abstract
Deposits of this type consist of disseminations and veins of uraninite/pitchblendc in volcanic rocks that are commonly felsic and subalkaline to peralkaline felsic in composition, but some potassic alkaline mafic to intermediate rocks also host uranium occurrences. The volcanic rocks are formed mainly in late- or postorogenic settings and continental extensional tectonic environments . They occur in all volcanic lithofacies, from proximal to distal in setting, including volcaniclastic sediments. Molybdenum, flourine, thorium, rare-earth elements , and lead-zinc, are commonly enriched in the deposits and may be of economic importance.