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TitleAlteration zones in the Wolverton Lake area, near Snow Lake, Manitoba
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorFroese, E
SourceGeological Survey of Canada, Open File 7405, 2017, 14 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
AreaSnow Lake; Wolverton Lake; Herbert Lake; Angus Bay
Lat/Long WENS-100.0000 -99.9167 55.0000 54.9375
Subjectsigneous and metamorphic petrology; bedrock geology; lithology; igneous rocks; felsic volcanic rocks; mafic volcanic rocks; intrusive rocks; granodiorites; metasedimentary rocks; metagreywackes; metamorphic rocks; gneisses; sedimentary rocks; arenites; intrusions; metamorphism; alteration; mineral assemblages; biotite; sillimanite; almandine; sulphides; anomalies; iron; aluminum; magnesium; pressure-temperature conditions; Missi Group; Amisk Group; Burntwood Group; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; graphs; phase diagrams
ProgramTargeted Geoscience Initiative (TGI-5) Volcanic and sedimentary systems
Released2017 08 22
AbstractNorth of Snow Lake, Manitoba, volcanic rocks and granitic intrusions, older than 1.87 Ga, have been metamorphosed to a grade corresponding to the biotite-sillimanite-almandine zone. The volcanic rocks, predominantly of felsic composition, include sulphide occurrences, as well as ferromagnesian and aluminous alteration, characterized, respectively, by orthoamphibole-bearing and sillimanite-bearing assemblages. The distribution of alteration types, particularly in the Wolverton Lake area, is shown.
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. The paper presents an account of the metamorphic minerals and rock types found in a zone of alteration near a base metal occurrence in the Wolverton Lake area of northern Manitoba. The rocks are nearly 1.9 billion years old and importantly appear to have been altered by mineralizing processes. The implication of the study is that more rocks that likely formed in the type of environment hosting these rock types could be found.

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