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Translation of original French
| Author: | Hébert, 1980 |
| Age: | Neoarchean |
| Reference section: | None |
| Type area: | La Dauversière Lake, southwest portion of NTS sheet 32G09 |
| Geological province: | Superior Province |
| Geological subdivision: | Abitibi Subprovince |
| Lithology: | Tonalite, granodiorite |
| Type: | Lithodemic |
| Rank: | Lithodeme |
| Status: | Formal |
| Use: | Active |
None
Background
The intrusion was first named the “La Dauversière Stock” by Hébert (1980), then the “La Dauversière Batholith” or “La Dauversière Pluton” by subsequent authors (Racicot et al., 1984; Daigneault, 1991; Roy et al., 2005).
Description
The inner part of the pluton consists of tonalite (≤10% biotite) that gradually evolves into granodiorite towards the core of the intrusion (Racicot et al., 1984). The La Dauversière Pluton is characterized by an intensively deformed edge zone, where tonalite develops a blastomylonitic texture and includes enclaves of Obatogamau Formation mafic volcanic rocks. The contact metamorphism aureole is up to 450 m thick (Hébert, 1979). Regionally, the La Dauversière Pluton is cut by several NNE-SSW faults related to the Grenvilian deformation (Hébert, 1979; Roy et al., 2005).
Thickness and Distribution
The La Dauversière Pluton is a 15-km-diameter subcircular intrusion located along the La Dauversière Anticline’s axial trace (Daigneault and Allard, 1990).
Dating
Sample LDP-1 returned a crystallization age of 2719.8 +3.0/-0.6 Ma (Mortensen, 1993).
| Isotopic System | Mineral | Crystallization Age (Ma) | (+) | (-) | Reference(s) |
| U-Pb | Zircon | 2719.8 | 3.0 | 0.6 | Mortensen, 1993 |
Stratigraphic Relationship(s)
The La Dauversière Pluton cuts mafic volcanic rocks of the Obatogamau Formation. It is cut by the NNE-SSW-oriented Chef Dykes (2408 ±3 Ma; Ciborowski et al., 2014).
Paleontology
Does not apply.
References
| Author(s) | Title | Year of Publication | Hyperlink (EXAMINE or Other) |
|---|---|---|---|
| CIBOROWSKI, T.J.R. – KERR, A.C. – McDONALD, I. – ERNST, R.E. – HUGHES, H.S.R. – MINIFIE, M.J. | The geochemistry and petrogenesis of the Paleoproterozoic du Chef dyke swarm, Québec, Canada. Precambrian Research; volume 250, pages 151-166. | 2014 | Source |
| DAIGNEAULT, R. | Évolution structurale du segment de roches vertes de Chibougamau, Sous-province archéenne de l’Abitibi, Québec. Université Laval; doctoral thesis, 352 pages. | 1991 | – |
| DAIGNEAULT, R. – ALLARD, G.O. | Le Complexe du lac Doré et son environnement géologique (région de Chibougamau – Sous-province de l’Abitibi). Ministère de l’Énergie et des Ressources, Québec; MM 89-03, 290 pages. | 1990 | MM 89-03 |
| HÉBERT, C. | Contexte géologique régional du gisement aurifère de la Mine Chibex, Chibougamau, Québec. Université du Québec à Chicoutimi; master’s thesis, 106 pages. | 1979 | Source |
| HÉBERT, C. | Géologie du quart sud-ouest du canton de La Dauversière et du quart nord-ouest du canton de Rohault, district de Chibougamau, Québec. Ministère de l’Énergie et des Ressources, Québec; DPV 723, 55 pages, 1 plan. | 1980 | DPV 723 |
| MORTENSEN, J.K. | U-Pb geochronology of the eastern Abitibi subprovince. Part 1: Chibougamau – Matagami – Joutel region. Canadian Journal of Earth Sciences; volume 30, pages 11–28. | 1993 | Source |
| RACICOT, D. – CHOWN, E.H. – HANEL, T. | Plutons of the Chibougamau-Desmaraisville belt; a preliminary survey. In Chibougamau : stratigraphy and mineralization (Guha, J. and Chown, E.H., editors). Canadian Institute of Mining and Metallurgy; volume 34, pages 178-197. | 1984 | – |
| ROY, P. – TURCOTTE, S. – CADÉRON, S. – HOULE, P. – SHARMA, K.N.M. | Géologie de la région du lac Charron (32G/08 et 32G/09). Ministère des Ressources naturelles et de la Faune, Québec; RG 2005-02, 35 pages, 3 plans. | 2005 | RG 2005-02 |