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TitleGeological setting of banded iron formation-hosted gold mineralization in the Geraldton area, Northern Ontario: preliminary results
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AuthorTòth, Z; Lafrance, B; Dubé, B; Mercier-Langevin, P; McNicoll, V
SourceGeological Survey of Canada, Open File 7370, 2013, 54 pages, https://doi.org/10.4095/292558 (Open Access)
Image
Year2013
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceOntario
NTS42E/10
AreaGeraldton; Mosher Lake
Lat/Long WENS-87.0000 -86.5000 49.7500 49.5000
Subjectseconomic geology; mineral occurrences; mineral deposits; gold; mineralization; volcanogenic deposits; sulphides; sulphide deposits; iron formations; Archean; metasedimentary rocks; igneous rocks; volcanic rocks; volcaniclastics; Archean; rhyolites; dykes; structural features; deformation; folds; faults; Beardmore- Geraldton Belt; Wabigoon Subprovince; Precambrian; Proterozoic
Illustrationslocation maps; photographs; photomicrographs; plots; tables
ProgramGold Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2013 05 02
Summary(Plain Language Summary, not published)
This document presents preliminary results from the study of auriferous mineralization located in the Geraldton area in northern Ontario. The auriferous mineralisation of the Geraldton district is in part hosted in sedimentary rocks, felsic intrusive rocks and in banded iron formations that were intensely deformed during at least three different tectonic episodes (D1 to D3). The mineralization consists of quartz veins containing sulfides and pyrite disseminations in vein selvages in high-strain zones. A sericite and iron-carbonate alteration accompanies the veins and mineralization. The veins are deformed and transposed by the S3 structural fabric and are folded by third generation folds (F3). This indicates that the veins and the mineralization were formed prior to D3 or very early in D3. Gold correlates with sulphur and tellurium and it is associated with a sodic and carbonated alteration.
GEOSCAN ID292558