DISCLAIMER: This English version is translated from the original French. In case of any discrepancy, the French version shall prevail.
|Type area:||Area ~5 km NW of Quévillon Lake, NE quarter of NTS sheet 32F03|
|Geological province:||Superior Province|
|Geological subdivision:||Abitibi Subprovince|
Then unnamed (lithological unit I1B) in the Ministère’s recent compilations (MNRF, 2010), Guemache (2020) gave it the formal name of Wedding Pluton, referring to the Wedding River which flows westward in the northern part of the pluton, to join the Bell River. Auger and Longley (1939) were the first to describe his lithologies, particularly in its western part, on the Bell River shores, but also in its the central part. In 1978, Sullivan and his team also described some outcrops along the Bell River. In 2005, an outcrop was revisited in the central part of the pluton as part of the Ministère‘s mapping work.
The dominant lithology is biotite granite, massive, grey, rarely reddish pink, medium to coarse-grained, locally porphyraceous in the presence of large feldspar crystals (Auger and Longley, 1939). The mineralogical assemblage includes quartz, zoned and sericitized plagioclase, orthose, microcline and biotite (3-5%). Accessory minerals include titanite, locally as coarse grains, apatite, zircon and magnetite. A relatively recent description of a large outcrop in the centre of the Wedding Pluton (2005-JY-1007) confirms the felsic character of the rock (granite). The latter is coarse grained, massive, K-feldspar porphyraceous (centimetric phenocrystals) and affected by a well-developed magmatic foliation oriented 071/76. The mineralogical composition includes quartz, biotite, chlorite, epidote and, in significant amounts, hematite. Along the pluton, the rock appears to evolve towards a quartz monzonite (Auger and Longley, 1939).
The Wedding Pluton has an almost circular geometry (10 km x 12 km) easily recognizable on the map of the vertical gradient of the residual total magnetic field (Keating et al., 2010; Keating and d’Amours, 2010).
Crosscutting relationships were not described in outcrop, but the contrast in the deformation intensity allows an assessment of the relative chronology. The Wedding Pluton intrudes into the Quévillon Group, whose age is not yet known. It also cuts a unit comprising an assemblage of gabbro, amphibolite and hornblendite, which lies on its western edge. Given the massive character of the rock and its quasi-circular geometry, the Wedding Pluton would probably be late to post-tectonic.
Does not apply.
AUGER, P E., LONGLEY, W W. 1939. REGION DE LA RIVIERE LAFLAMME INFERIEURE, TERRITOIRE D’ABITIBI. MRN. RG 002, 43 pages and 1 plan.
GUEMACHE, M A. 2020. Synthèse géologique de la région de rivière Octave, Abitibi. MERN. RG 2018-01, 68 pages et 1 plan.
KEATING, P., D’AMOURS, I. 2010. REEDITION DES DONNEES NUMERIQUES EN FORMAT GEOSOFT (PROFILS) DES LEVES AEROPORTES DE L’ABITIBI, AU QUEBEC. MRNF, COMMISSION GEOLOGIQUE DU CAN. DP 2010-09, 6 pages.
KEATING, P., LEFEBVRE, D., RAINSFORD, D., ONESCHUCK, D. 2010. SERIE DES CARTES GEOPHYSIQUES, PARTIES DES SNRC 31, 32, 41 ET 42, CEINTURE DE ROCHES VERTES DE L’ABITIBI, QUEBEC ET ONTARIO. COMMISSION GEOLOGIQUE DU CAN. DP 2010-05, 8 pages and 2 plans.
MRNF, 2010. CARTE(S) GÉOLOGIQUE(S) DU SIGEOM – feuillet 32F. CG SIGEOM32F, 64 plans.
SULLIVAN, D L. 1978. REGIONAL GEOLOGY PROGRESS REPORT, THEMINES PROJECT. MINES LAC MATTAGAMI LTEE. Assessment report submitted to the Government of Québec. GM 38153, 61 pages and 4 plans.
Ministère de l’Énergie et des Ressources naturelles (MERN). Wedding Pluton. Quebec Stratigraphic Lexicon. https://gq.mines.gouv.qc.ca/lexique-stratigraphique/province-du-superieur/pluton-de-wedding_en [accessed on Day Month Year].
Mehdi A. Guemache, P. Geo., Ph.D. firstname.lastname@example.org (redaction and coordination)
Pierre Lacoste, P. Geo., M.Sc. (critical review); Claude Dion, Eng., M.Sc. (editing); Céline Dupuis, P. Geo., Ph.D. (English version); Ricardo Escobar Moran (HTML editing).