| Title | Petrography, chemical composition, and age constraints of mafic intrusions from the Mesoproterozoic Soisson Intrusive Suite in the southeastern Churchill Province (Canada) |
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| Author | Sappin, A -A ;
Houlé, M G; Corrigan, D; Bédard, M -P; Rayner, N; Wodicka, N; Brind'Amour-Côté, C |
| Source | Canadian Journal of Earth Sciences 2022 p. 1-25, https://doi.org/10.1139/cjes-2021-0059 |
| Image |  |
| Year | 2022 |
| Alt Series | Natural Resources Canada, Contribution Series 20210395 |
| Publisher | Canadian Science Publishing |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf; html |
| Province | Newfoundland and Labrador; Quebec |
| Area | Churchill Province; Canada |
| Lat/Long WENS | -72.0000 -60.0000 61.0000 54.0000 |
| Subjects | Science and Technology; mineralogy; mineralization; Proterozoic; Mesozoic |
| Illustrations | location maps; diagrams; photomicrographs; cross-plots; charts; graphs; tables |
| Program | GEM-GeoNorth: Geo-mapping for Energy and Minerals GEM Program Coordination |
| Released | 2022 02 16 |
| Abstract | Several kilometer-scale gabbroic intrusions with well-preserved cumulate textures occur over a ~180-km NW-SE strike length area in the Core Zone, within the southeastern Churchill Province. These
intrusions (1312-1311 Ma) are devoid of structural and metamorphic overprint and are mainly composed of olivine gabbro. Their overlapping petrographic, geochemical, and mineralogical characteristics suggest that all of these gabbroic intrusions are
co-genetic and form the Soisson Intrusive Suite. The Soisson intrusions formed from basaltic parental magmas with low MgO (~7-6 wt.%) and high Fe-Ti contents. Overall, they are similarly fractionated at the regional-scale and incorporated various
amounts of upper crustal material, as indicated by field (e.g., xenoliths, hybrid zones) and geochemical (e.g., high HILE/MILE, depletion in Nb±Ta) evidences. The Soisson Intrusive Suite has petrological, geochemical, and mineral chemistry
similarities with the troctolite and olivine gabbro cumulates of the Voisey's Bay and Mushuau intrusions from the ca. 1363 to 1289 Ma Nain Plutonic Suite (NPS), and appears to be contemporaneous with its younger gabbroic-troctolitic intrusion phase,
suggesting that the Soisson Intrusive Suite and the gabbroic-troctolitic intrusions of the NPS were formed by similar petrological processes. Furthermore, like many gabbroic-troctolitic intrusions of the NPS (e.g., Voisey's Bay intrusion), the
Soisson intrusions contain Ni-Cu-Co magmatic sulfide mineralization. Among the Soisson intrusions, the Papavoine intrusion located in the southern part of this intrusive suite may be the most prospective intrusion as a Ni, Cu, and Co exploration
target. Overall, the Soisson Intrusive Suite's similarity with the NPS opens questions about their potential genetic link and magmatic connectivity at depth. |
| Summary | (Plain Language Summary, not published)
In this article submitted to the Canadian Journal of Earth Sciences journal for publication, we studied several kilometer-scale gabbroic intrusions,
which occur within the southeastern Churchill Province. Their overlapping petrographic, geochemical, mineralogical, and geochronological characteristics suggest that all of these intrusions are co-genetic and form part of the same intrusive suite,
the Soisson Intrusive Suite. Furthermore, we demonstrated that the Soisson Intrusive Suite shares petrological, geochemical, and mineral chemistry similarities with the Voisey's Bay and Mushuau intrusions, two gabbroic intrusions belonging to the
Nain plutonic Suite (NPS) and that it is contemporaneous with the younger gabbroic intrusions of the NPS. This suggests that the gabbroic intrusions of the Soisson Intrusive Suite and the NPS were formed by similar petrological processes. Like many
gabbroic intrusions of the NPS (e.g., Voisey's Bay intrusion), the intrusions of the Soisson Intrusive Suite contain Ni-Cu-Co mineralization. Among these intrusions, the Papavoine intrusion may be the most prospective intrusion as a nickel, copper,
and cobalt exploration target in the area. |
| GEOSCAN ID | 329215 |
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