|Author:||Pilote et al., 2019|
|Type area:||East-central portion of NTS sheet 32C05 (Mont-Vidéo Road)|
|Geological province:||Superior Province|
|Geological subdivision:||Abitibi Subprovince|
|Lithology:||Mafic and ultramafic intrusive rocks|
Table des matières
The formal name “Mont-Vidéo Intrusive Suite” was proposed by Pilote et al. (2019) following the 2018 field campaign. It refers to a mafic-ultramafic intrusion located on Mont-Vidéo Road (sheet 32C05), which contains the Vendôme No 2 (Mogador) nickel mineralized zone. These intrusive rocks were originally described by Jones (1964) in the NW quarter of Fiedmont Township. These lithologies do not outcrop, but have been the subject of several drilling campaigns (see numerous documents cited for the Vendôme No 2 [Mogador] deposit), the most recent of which dates from the late 1980s. Unfortunately, these drills are now unavailable. Jones (1964) described these intrusive units extensively (peridotite, gabbro, amphibolite), but did not propose a formal name at the time. Beullac (1983) plotted most of the original interpretation of Jones (1964) on its map, without significant modifications.
The Mont-Vidéo Intrusive Suite consists of ultramafic intrusions (peridotite and pyroxenite), amphibolite, gabbro and diorite (Jones, 1964). These intrusive rocks occur as irregular clusters, sills and dykes cutting volcanic host rocks. These intrusions are likely contemporary to volcanism (Jones, 1964). Peridotite is massive, dark blue, commonly fine grained and completely altered to secondary minerals, typically serpentine, actinolite-tremolite and talc (Jones, 1964). Late dykes and intrusions of quartz monzonite and granodiorite cut ultramafic and mafic lithologies (Jones, 1964) and likely represent pre-existing units that have been telescoped by much younger felsic intrusions, possibly similar to some of the adjacent phases associated with the La Corne Batholith.
The size and interpreted geometry of this intrusive sequence were defined from drilling that intercepted it (see the Vendôme No 2 [Mogador] mineralized zone record for an exhaustive list) and high-resolution aeromagnetic survey (Dubé, 2016). The main intrusive mass thus shows a diameter of ~1 km, based on drilling and various geophysical surveys (Brown, 1958; Jones, 1964; GSC et al., 2009; Dubé, 2016).
Mafic and ultramafic intrusions of the Mont-Vidéo Intrusive Suite cut volcanic rocks interpreted as belonging to the Lanaudière Formation (Jones, 1964; Pilote et al., 2019).
Does not apply.
BEULLAC, R. 1983. REGION DE BARRAUTE-FIEDMONT. MRN. DP-84-02, 1 plan.
BROWN, W G. 1958. RAPPORT PRELIMINAIRE SUR LE QUART NORD-EST DU CANTON DE FIEDMONT, DISTRICT ELECTORAL D’ABITIBI-EST. MRN. RP 364, 30 pages and 1 plan.
BROWN, W G. 1958. PRELIMINARY REPORT ON THE NORTHEAST QUARTER OF FIEDMONT TOWNSHIP, ELECTORAL DISTRICT OF ABITIBI-EAST. MRN. RP 364(A), 13 pages and 1 plan.
COMMISSION GEOLOGIQUE DU CANADA, NORANDA EXPLORATION, MINES D’OR VIRGINIA INC. 2009. CARTES GEOPHYSIQUES COULEURS MEGATEM — 32C05. DP 2008-06, 5 pages and 4 plans.
DUBE, J. 2016. TECHNICAL REPORT, MODELLING OF MAGNETIC DATA FOR EXPLORATION TARGETS DEFINITION, VENDOME SUD PROJECT. BLACK WIDOW RESOURCES INC. Assessment work submitted to the Government of Québec. GM 69536, 42 pages and 10 plans.
JONES, R E. 1964. QUART NORD-OUEST DU CANTON DE FIEDMONT, COMTE D’ABITIBI-EST. MRN. RG 108, 39 pages and 1 plan.
JONES, R E. 1964. NORTHWEST QUARTER OF FIEDMONT TOWNSHIP, ABITIBI-EAST COUNTIES. MRN. RG 108(A), 35 pages and 1 plan.
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