First published: 27 November 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): | Parent et al., 2000 |
| Age: | Neoarchean |
| Stratotype: | None. Outcrop 1998-MP-1079, located ~12 km SW of Duvert Lake, exposes rocks typical of this unit. |
| Type area: | Nedlouc Lake area (NTS sheets 34H and 24E) |
| Geological province: | Superior Province |
| Geological subdivision: | Minto Subprovince |
| Lithology: | Diatexite |
| Category: | Lithodemic |
| Rank: | Suite |
| Status: | Formal |
| Use: | Active |
None
Background
The Rivière aux Mélèzes Suite was defined in the Nedlouc Lake area (sheets 34H and 24E) by Parent et al. (2000, 2001) to describe diatexite located in the Goudalie Domain. Simard et al. (2008) also assigned a small strip of diatexite located in its SE extension (Maricourt area, sheet 24D), which previously belonged to the Du Gué Complex (abandoned term).
Description
The Rivière aux Mélèzes Suite consists of yellowish grey to rust-brown biotite-garnet-cordierite-andalusite-sillimanite diatexite (Parent et al., 2000, 2001; Berclaz et al., 2001, 2002; Simard, 2008; Simard et al., 2008). Orthopyroxene, clinopyroxene and hornblende are absent (Berclaz et al., 2001, 2002), which distinguishes this diatexite from that of the Lac Minto Suite (Parent et al., 2000, 2001). The leucosome is heterogeneous, monzogranitic to granodioritic in composition, and mostly porphyritic. The paleosome is fine-grained mesocratic. The neosome contains metric to decimetric enclaves of paragneiss and, more sparsely, mafic to intermediate gneiss, as well as millimetric biotite and sillimanite schlierens. These schlierens define a more or less developed foliation that undulate around garnet porphyroblasts and feldspar phenocrystals. The neosome contains biotite, poikiloblastic garnet (with quartz, plagioclase, biotite, cordierite, magnetite and sillimanite inclusions), cordierite, andalusite, sillimanite (with green spinel inclusions locally), and zircon. In places, plagioclase is sericitized, while biotite and garnet are partially retrograded to chlorite.
Thickness and distribution
The Rivière aux Mélèzes Suite extends over approximately 125 km long and 25 km wide, in sheets 24D13, 24E04, 24E05, 34H01, 34H08, 34H09, 34H10, 34H15 and 34H16. It covers an area of ~1000 km2.
Dating
| Unit | Sample Number | Isotopic System | Mineral | Crystallization Age (Ma) | (+) | (-) | Inherited Age (Ma) | (+) | (-) | Reference(s) |
| nAram | 98-AL-127-A | U-Pb | Zircon | 2669 | 11 | 11 | 2750 | 12 | 12 | David et al., 2019 |
Stratigraphic Relationship(s)
Diatexites of the Rivière aux Mélèzes Suite have the same characteristics as those described in the Ashuanipi Subprovince (Percival et al., 1992; Leclair et al., 1998; Lamothe et al., 1998) and elsewhere in the NE Superior Province (Percival et al., 1991). Parent et al. (2000, 2001) observed that heterogeneous diatexite masses are in gradual contact with homogeneous granite and granodiorite masses. These relationships indicate that at least some of these granites and granodiorites are products of magma crystallization derived from a more important intracrustal anatectic process than that which causes the diatexites.
Paleontology
Does not apply.
References
Publications Available Through SIGÉOM Examine
BERCLAZ, A., CADIEUX, A M., SHARMA, K N M., DAVID, J., PARENT, M., LECLAIR, A. 2001. GEOLOGIE DE LA REGION DU LAC AIGNEAU (24E ET 24F/04). MRN. RG 2001-01, 51 pages and 2 plans.
BERCLAZ, A., CADIEUX, A M., SHARMA, K N M., DAVID, J., PARENT, M., LECLAIR, A. 2002. GEOLOGY OF THE LAC AIGNEAU AREA (24E AND 24F/04). MRN. RG 2001-05, 44 pages and 2 plans.
DAVID, J., MAURICE, C., SIMARD, M. 2009. DATATIONS ISOTOPIQUES EFFECTUEES DANS LE NORD-EST DE LA PROVINCE DU SUPERIEUR – TRAVAUX DE 1998, 1999 ET 2000. MRNF. DV 2008-05, 92 pages.
LAMOTHE, D., LECLAIR, A., CHOINIERE, J. 1998. GEOLOGIE DE LA REGION DU LAC VALLARD. MRN. RG 98-13, 35 pages and 1 plan.
LECLAIR, A., LAMOTHE, D., CHOINIERE, J., PARENT, M. 1998. GEOLOGIE DE LA REGION DU LAC BERMEN (23F). MRN. RG 97-11, 42 pages and 2 plans.
PARENT, M., LECLAIR, A., DAVID, J., SHARMA, K N M. 2000. GEOLOGIE DE LA REGION DU LAC NEDLOUC (SNRC 34H ET 24E). MRN. RG 99-13, 46 pages and 2 plans.
PARENT, M., LECLAIR, A., DAVID, J., SHARMA, K N M. 2001. GEOLOGY OF THE LAC NEDLOUC AREA (NTS 34H AND 24E). MRN. RG 2000-09, 41 pages and 2 plans.
SIMARD, M. 2008. LEXIQUE STRATIGRAPHIQUE DES UNITES ARCHEENNES DU NORD-EST DE LA PROVINCE DU SUPERIEUR. MRNF. DV 2008-03, 107 pages.
SIMARD, M., LABBE, J Y., MAURICE, C., LACOSTE, P., LECLAIR, A., BOILY, M. 2008. SYNTHESE DU NORD-EST DE LA PROVINCE DU SUPERIEUR. MRNF. MM 2008-02, 198 pages and 8 plans.
Other publications
PERCIVAL, J A., CARD, K D., STERN, R A., BÉGIN, N J. 1991. A geological transect of the Leaf River area, northeastern Superior Province, Ungava Peninsula, Quebec. In Current Research, Part C, Canadian Shield; Geological Survey of Canada, Paper no. 91-1C, pages 55-63. https://doi.org/10.4095/132560
PERCIVAL, J A., MORTENSEN, J K., STERN, R A., CARD, K D., BÉGIN N J. 1992. Giant granulite terranes of northeastern Superior Province: the Ashuanipi complex and Minto block. Canadian Journal of Earth Sciences; volume 29, pages 2287-2308. https://doi.org/10.1139/e92-179
PERCIVAL, J A., STERN, R A., SKULSKI, T. 2001. Crustal growth through successive arc magmatism: reconnaissance U-Pb SHRIMP data from the northeastern Superior Province, Canada. Precambrian Research; volume 109, pages 203-238. https://doi.org/10.1016/s0301-9268(01)00148-6
Suggested Citation
Ministère de l’Énergie et des Ressources naturelles (MERN). Rivière aux Mélèzes Suite. Quebec Stratigraphic Lexicon. https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/suite-de-la-riviere-aux-melezes_en [accessed on Day Month Year].
Contributors
|
First publication |
Sarah Blais, B.Sc.; Céline Dupuis, P. Geo., Ph.D. celine.dupuis@mern.gouv.qc.ca (redaction) Mehdi A. Guemache, P. Geo., Ph.D. (coordination and critical review); Simon Auclair, P. Geo., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); Nathalie Bouchard (HTML editing). |