First published: 1 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): | Pilote et al., 1984 |
| Age: | Neoarchean |
| Stratotype: | The type outcrop 2003-FL-132 corresponds to stripping TR99-31 performed by SOQUEM (UTM NAD83, Zone 18: 548688 m E, 5533292 m N). It consists of coarse-grained tonalite containing pyroxenite enclaves, cut by a chlorite veinlet stockwerk and pyrite-chalcopyrite-malachite veins. |
| Type area: | 2 km north of the city of Chibougamau, in QTS sheet 32G16-200-0201 |
| Geological province: | Superior Province |
| Geological subdivision: | Abitibi Subprovince |
| Lithology: | Tonalite, syenite |
| Category: | Lithodemic |
| Rank: | Lithodeme |
| Status: | Formal |
| Use: | Active |
None
Background
The Lac Line Stock was first mentioned by Pilote et al. (1984).
Description
The Lac Line Stock consists of three phases (Pilote et al., 1984; Pilote, 1986; Côté-Mantha, 2009): (a) even-grained to porphyritic tonalite containing up to 10% biotite and amphibole; (b) acicular amphibole porphyritic syenite, observed locally; and (c) diorite and gabbro changing gradually over a few metres to even-grained tonalite. The even-grained tonalite facies dominate in the western portion of the stock, while porphyritic facies dominate from Belle Bay Lake.
Thickness and distribution
The Lac Line Stock is irregularly shaped and extends between Line Lake and Cran Penché Bay for 3.7 km.
Dating
A tonalite sample yielded an age of 2707.6 ±1.4 Ma (Côté-Mantha, 2009).
| Isotopic System | Mineral | Crystallization Age (Ma) | (+) | (-) | Reference(s) |
| U-Pb | Zircon | 2707.6 | 1.4 | 1.4 | Côté-Mantha, 2009 |
Stratigraphic Relationship(s)
The Lac Line Stock cuts volcano-sedimentary rocks of the Bruneau and Blondeau formations, as well as mafic to ultramafic intrusive rocks of the Cummings Intrusive Suite. It is unconformably overlain by Paleoproteozoic sedimentary rocks of the Chibougamau Formation.
Paleontology
Does not apply.
References
Other publications
CÔTÉ-MANTHA, O. 2009. Architecture et origine du système de minéralisation polymétallique du secteur Lac Line, région de Chibougamau, Québec. Université du Québec à Chicoutimi; Doctoral thesis, 508 pages. https://constellation.uqac.ca/182
PILOTE, P. 1986. Stratigraphie et signification des minéralisations dans le secteur du mont Bourbeau, canton de McKenzie, Chibougamau. Université du Québec à Chicoutimi; Masters thesis, 182 pages. https://constellation.uqac.ca/1734
PILOTE, P., GUHA, J., DIMROTH, E., TREMBLAY, A., GOBEIL, 1984. A. Stratigraphic positions of mineralized occurrences in the Mount Bourbeau and lac Berrigan regions and their significance In Chibougamau : stratigraphy and mineralization (Guha, J. and Chown, E.H., editors). Canadian Institute of Mining and Metallurgy; volume 34, pages 288-299.
Suggested Citation
Ministère de l’Énergie et des Ressources naturelles (MERN). Lac Line Stock. Quebec Stratigraphic Lexicon. https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/stock-du-lac-line_en [accessed on Day Month Year].
Contributors
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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). |