First published: 5 February 2019
Last modified:
DISCLAIMER: This English version is translated from the original French. In case of any discrepancy, the French version shall prevail.
| Author(s): | Graham, 1952 |
| Age: | Neoarchean |
| Stratotype: | None |
| Type area: | Area north of Hématite Bay, in QTS sheet 32G16-200-0202. |
| Geological province: | Superior Province |
| Geological subdivision: | Abitibi Subprovince |
| Lithology: | Granodiorite |
| Category: | Lithodemic |
| Rank: | Lithodeme |
| Status: | Formal |
| Use: | Active |
None
Background
The first description of the Grandroy Stock was given by Graham (1952).
Description
The intrusion consists of coarse-grained grey granodiorite in fresh exposure. Fracturing the rock results in alteration to chlorite, epidote and hematite giving the rock a beige to pink patina.
Thickness and distribution
The Grandroy Stock outcrops primarily on the shores of Hématite Bay (Chibougamau Lake), but some outcrops attributed to this stock have also been identified south of Bear Bay. The northern limit of the Grandroy Stock is marked by the Grondines Shear Zone.
Dating
None.
Stratigraphic Relationship(s)
North of Hématite Bay, the Grandroy Stock cuts mafic volcanic rocks of the David Member, volcanoclastic rocks of the Allard Member (2726.7 ±0.7 Ma; Leclerc et al., 2011) and mafic volcanic rocks of the Bruneau Formation (2724.4 ±1.2 Ma; Davis et al., 2014). West of Mount Sorcier, following Bear Bay, the Grandroy Stock cuts rocks of the Lac Doré Intrusive Suite anorthositic zone (2728.3 +1.2/-1.1 to 2727.0 ±1.3 Ma; Mortensen, 1993).
Paleontology
Does not apply.
References
Publications available through SIGÉOM Examine
DAVIS, D.W., SIMARD, M., HAMMOUCHE, H., BANDYAYERA, D., GOUTIER, J., PILOTE, P., LECLERC, F., DION, C., 2014. Datations U-Pb effectuées dans les provinces du Supérieur et de Churchill en 2011-2012. MERN, GEOCHRONOLOGICAL LABORATORY; RP 2014-05, 62 pages.
GRAHAM, R B., 1952. CHIBOUGAMAU, ITS MINING POSSIBILITIES. MRN; S 015, 9 pages.
Other publications
LECLERC, F., BÉDARD, J.H., HARRIS, L.B., McNICOLL, V., GOULET, N., ROY, P., HOULE, P. 2011. Tholeiitic to calc-alkaline cyclic volcanism in the Roy Group, Chibougamau area, Abitibi Greenstone Belt – Revised stratigraphy and implications for VHMS exploration. Canadian Journal of Earth Sciences; volume 48, pages 661-694. https://doi.org/10.1139/E10-088
MORTENSEN, J.K. 1993. U-Pb geochronology of the eastern Abitibi subprovince. Part 1 : Chibougamau – Matagami – Joutel region. Canadian Journal of Earth Sciences; volume 30, pages 11-28. https://doi.org/10.1139/e93-002
Suggested Citation
Ministère de l’Énergie et des Ressources naturelles (MERN). Grandroy Stock. Quebec Stratigraphic Lexicon. https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/stock-de-grandroy_en [accessed on Day Month Year].
Contributors
First publication | François Leclerc, P. Geo., Ph.D. françois.leclerc@mern.gouv.qc.ca (redaction) Mehdi A. Guemache, P. Geo., Ph.D. (coordination); Céline Dupuis, P. Geo., Ph.D. (critical review and English version); Simon Auclair, P. Geo., M.Sc. (editing); André Tremblay (HTML editing). |