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TitleAlteration vectoring to IOCG(U) deposits in frontier volcano-plutonic terrains, Canada
AuthorCorriveau, L; Ootes, L; Mumin, H; Jackson, V; Bennett, V; Cremer, J F; Rivard, B; McMartin, I; Beaudoin, G
SourceMine site exploration and ore delineation & ore deposits and exploration technology; Proceedings of exploration 07: Fifth decennial international conference on mineral exploration; by Milkereit, B (ed.); 2007 p. 1171-1177
LinksOnline - En ligne
Year2007
Alt SeriesEarth Sciences Sector, Contribution Series 20070327
MeetingExploration 07: Fifth decennial international conference on mineral exploration; Toronto; CA; September 9, 2007
Documentbook
Lang.English
Mediapaper; on-line; digital
ProvinceNorthwest Territories
NTS85M/09; 85M/10; 85M/11; 85M/12; 85M/13; 85M/14; 85M/15; 85M/16; 85N; 85O; 86B; 86C; 86D; 86E; 86F; 86G; 86J; 86K; 86L
AreaPort Radium; Echo Bay; Great Bear Lake
Lat/Long WENS-120.0000 -114.0000 67.0000 63.0000
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; mineral occurrences; mineral deposits; gold; iron; iron oxides; copper; uranium; mineralization; igneous rocks; volcanic rocks; plutonic rocks; alteration; feldspathization; sericitization; pyritization; hydrothermal alteration; hydrothermal deposits; geochemical interpretations; geochemical surveys; Great Bear Magmatic Zone
Illustrationssketch maps; tables
ProgramDeep Search TGI-3, Targeted Geoscience Initiative (TGI-3), 2005-2010
AbstractIron Oxide Copper-Gold (±U-Ag-Co-Bi) deposits (IOCG) and the uranium-rich ones (IOCG(U)) provide a relatively new and exciting exploration opportunity in Canada. They are, however, challenging as most prospective Canadian settings are frontier felsic-to-intermediate volcano-plutonic terrains mapped prior to the recognition of the IOCG deposit-type in the 1990's. On-going research on stunning exposures of IOCG(U) alteration patterns in the Great Bear magmatic zone (NWT) demonstrates that the hydrothermal alteration footprint related to IOCG(U) mineralization demarcates prospective regions and, within these regions, can point to mineralization. Non-mineralized, but regionally significant alteration types include: 1) early and intensive sodic alteration distal to mineralization and most proximal to intrusive heat sources; 2) in their periphery and away from intrusions, extensive calcic-iron (magnetite-actinolite-apatite) alteration that is commonly texture-destructive and coarse-grained, and; 3) subordinate vein-type overprint or laterally-extensive mild potassic alteration. Alteration types proximal to mineralization start where intensive replacement-type K-feldspar or biotite alteration, with magnetite at first, develops. In these zones, brecciation and polymetallic sulphide enrichments are coeval to, or slightly post-date the potassic alteration. Such zones can also be affected by skarn-like calc-silicate alteration, late-stage K-feldspar overprint and hematite alteration with their associated mineralization. Porphyry copper alteration systems and some types of epithermal mineralization are also clearly associated with the significant IOCG systems. The intensive iron oxide and potassic footprints, the striking recrystallization associated with certain alteration types, and the systematic evolution of alteration enable the development of strategic exploration tools at the regional- to deposit-scale. Our goals are to refine key alteration zoning models, better define timing relationships for IOCG(U) deposits and alteration, adapt alteration and geochemical vectors to frontier terrains, provide reference rock and mineral indicator databases for till geochemical and mineral indicator fingerprinting, and develop predictive hyperspectral airborne or spaceborne capabilities. Collectively, these efforts will increase our ability to target potential mineral resources in frontier volcano-plutonic terrains of Canada.
GEOSCAN ID224365