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TitleWhole-rock oxygen-isotope mapping of the footwall alteration zones at the Lalor auriferous VMS deposit, Snow Lake, west-central Manitoba (NTS 63K16)
AuthorMercier-Langevin, P; Caté, A; Ross, P S
SourceManitoba Science, Technology, Energy and Mines, Manitoba Geological Survey, Report of Activities 2014, 2014 p. 94-103 (Open Access)
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20140262
PublisherManitoba Geological Survey
File formatpdf
AreaSnow Lake
Lat/Long WENS-100.2500 -99.8750 54.8869 54.7500
Subjectsmetallic minerals; geochemistry; alteration; oxygen isotopes; volcanogenic deposits; gold; sulphide deposits; deformation; metamorphism; Lalor deposit; VMS Deposit; Precambrian; Proterozoic
Illustrationslocation maps; geologic maps; graphs
ProgramTargeted Geoscience Initiative (TGI-4), Volcanogenic Massive Sulfide Ore Systems
The Paleoproterozoic Lalor auriferous volcanogenic massive-sulphide (VMS) deposit (25.3 Mt grading 2.9 g/t Au, containing ~70 t Au) is the largest and richest VMS deposit of the Snow Lake camp. The deposit has been intensely deformed and metamorphosed to amphibolite facies, and is associated with a transposed zone of intense footwall alteration that extends hundreds of metres underneath and laterally away from the stacked ore lenses. Whole-rock oxygen-isotope mapping of the footwall mineralogical alteration assemblages and related chemical associations indicates a partly transposed, laterally extensive, high-temperature (<=350ºC, delta-18O <= 6 o/oo) reaction zone. There is a direct correlation between the delta-18O signature and the intensity of the alteration at Lalor, suggesting that whole-rock oxygen isotopes were not reset during metamorphism, and that they can be used to vector toward ore.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This report presents preliminary results of whole-rock oxygen isotopic mapping undertaken at the Lalor project in northern Manitoba as part of the Geological Survey of Canada¿s (GSC) Targeted Geoscience Initiative 4 (TGI-4) program¿s VMS project. Alteration vectors are defined and potential tools for vectoring in a near deposit environment are presented.