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TitleMagnetite composition as petrogenetic and prospectivity indicator for FE-TI-V-P mineralization in Archean mafic-ultramafic intrusions within the Superior Province, Ontario and Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorSappin, A -AORCID logo; Houlé, M G
SourceGeological Survey of Canada, Scientific Presentation 120, 2021, 1 sheet, Open Access logo Open Access
PublisherNatural Resources Canada
MeetingAME Roundup 2021; January 18-22, 2021
Mediaon-line; digital
File formatpdf
ProvinceManitoba; Newfoundland and Labrador; Ontario; Quebec
NTS21E; 21L; 21M; 22E; 22L; 22M; 22D; 23D; 23E; 23L; 31; 32; 33; 41; 42; 43; 52; 53; 62I; 62J; 63A; 63B; 63G; 63H; 63I; 63J; 62O; 62P
Lat/Long WENS-100.0000 -70.0000 55.0000 45.0000
Subjectseconomic geology; tectonics; geochemistry; Science and Technology; Nature and Environment; mineral exploration; mineral deposits; metals; iron; titanium; vanadium; phosphorus; magmatic deposits; hydrothermal deposits; ore mineral genesis; mineralization; ore controls; petrogenesis; magnetite; oxides; bedrock geology; lithology; igneous rocks; mafic rocks; ultramafic rocks; intrusive rocks; metamorphic rocks; metavolcanic rocks; tectonic setting; greenstone belts; magmatism; volcanism; intrusions; dykes; Archean; Superior Province; Wawa-Abitibi Subprovince; Bird River-Uchi-Oxford-Stull-La Grande Rivière-Eastmain (BUOGE) Superdomain; Abitibi Greenstone Belt; Big Mac Intrusion; Ring of Fire Intrusive Suite; Ekwan River Subsuite; Croal Lake Intrusion; Butler West Intrusion; Butler East Intrusion; Highbank-Fishtrap Intrusion; Oxtoby Lake Intrusion; Wabassi Main Intrusion; Baie Chapus Pyroxenite Intrusion; Rivière Bell Intrusion; Lac Doré Intrusion; platinum group elements; Precambrian
Illustrationsgeoscientific sketch maps; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-6) Ore systems
Released2021 01 06
The mineral chemistry of magnetite from various Archean mafic to ultramafic intrusions within the Superior Province (Fig. 1) was characterized in order to identify the most prospective areas to host Fe-Ti-V and Fe-Ti-P mineralization, but also to be used as a petrogenetic indicator. The composition of magnetite is influenced by the presence of exsolutions and inclusions, the type of parental melt, and the element partitioning with co-crystallized minerals or previously crystallized minerals. The overall composition of magnetite, however, appears to be mainly independent of the host-rock type. The composition of magnetite in compatible (e.g., Mg, Co, V, Ni, and Cr) and incompatible (e.g., Al, Ga, Mn, Ti, and Zn) elements provides useful information regarding the degree of fractionation and the internal stratigraphy of each host intrusion. In addition, the V and Ni+Cr contents of magnetite can be used as a prospectivity indicator for Fe-Ti-V-P mineralization.
Overall, magnetite signatures from these Archean intrusions are characterized by lower Ti+V values than expected, with magnetite compositions plotting within fields for hydrothermal deposits rather than within fields for Fe-Ti-V and Fe-Ti-P deposits, as shown in Ni/(Cr+Mn) versus Ti+V, Ca+Al+Mn versus Ti+V, and Ni+Cr versus Ti+V discrimination diagrams. Considering that the Fe-Ti-V-P deposit fields in these diagrams were mainly defined based on Fe-oxides hosted within Proterozoic and Phanerozoic Fe-Ti deposits, the preliminary results presented here suggest there may be a specific signature for magnetite from Archean Fe-Ti-V-oxide-bearing intrusions. However, further investigations are required to corroborate this distinct signature to the Archean.
Summary(Plain Language Summary, not published)
The chemical composition of magnetite from various Archean geological units host to iron, titanium and vanadium mineralization, within the Superior Province was characterized. This study allowed 1) to identify the main factors influencing the composition of magnetite (e.g., occurrence of mineral inclusion in magnetite, magma type from which it is formed), 2) to determine the internal stratigraphy of the host units, 3) to demonstrate the utility of magnetite to identify the most prospective areas to host iron, titanium and vanadium mineralization. Furthermore, the preliminary results presented here suggest there may be a specific signature for magnetite from the oldest iron-titanium-vanadium deposits.

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