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Mines

Tuesday, November 22, 2022 – afternoon

Session 2: Geoscientific knowledge acquisition work by Géologie Québec and its university partners – Eeyou Istchee James Bay

Chair and session organizer

François Leclerc

MERN

Co-chair

Hugo Dubé-Loubert

MERN

This session will be offered in french.

Géologie Québec unveils the results of its geoscientific knowledge acquisition surveys completed in 2021-2022. Be on the lookout for novel interpretations, new mineralized zones and prospective elements for mining exploration. Come and learn more about the university projects carried out in partnership with Géologie Québec. Four sessions will focus on the Nunavik, Eeyou Istchee James Bay, Grenville and Abitibi regions respectively.

1:30 p.m.

Welcome from the Chair

1:35 p.m.

Geological synthesis of the Nemiscau Subprovince, Eeyou Istchee James Bay

Conference details

Authors: Daniel Bandyayera (MERN), Emmanuel Caron-Côté (MERN), Rocío Pedreira Perez (UQÀM), Myriam Côté-Roberge (MERN) and William Chartier-Montreuil (MERN)

2:05 p.m.

Structural and geochronological (U-Pb) constraints on the tectonometamorphic evolution of the Nemiscau Subprovince, Superior Province, Québec

Conference details

Authors: Rocío Pedreira Pérez (UQÀM) Alain Tremblay (UQÀM), Yannick Daoudene (MERN), Jean David (MERN) and Daniel Bandyayera (MERN)

2:20 p.m.

Perspectives on chromium mineralization in the Superior Province: the case of the Lac des Montagnes Intrusion, La Grande Subprovince, James Bay

Conference details

Authors: Michel G. Houlé (GSC), M.P. Bédard (GSC), K. Kuster (Laurentian U.), A.-A. Sappin (GSC), C.M. Lesher (Laurentian U.) and D. Bandyayera (MERN)

2:35 p.m.

Geology of the Le Vilin Lake area, Eeyou Istchee James Bay.

Conference details

Authors: Daniel Bandyayera (MERN) and Emmanuel Caron-Côté (MERN)

A new 1: 50,000 scale geological map of the Le Vilin Lake area has been produced following a survey conducted during the summer of 2021. Our work radically changes the boundary between the La Grande and Opatica subprovinces and confirms the eastward extension of the Lac des Montagnes Belt (LMB). The latter is now interpreted as part of the La Grande Subprovince because of stratigraphic and metamorphic similarities with the Moyenne and Basse-Eastmain Greenstone Belt (MBEGB). The northern part of the study area exposes a transitional metasedimentary package between the La Grande and Opinaca (Prosper Formation), which contains significant white pegmatite injections. This metasedimentary package is underlain by tonalitic gneisses of the Champion Complex. In the center, the LMB rests on the tonalitic basement of the Hutte Complex. The belt is formed by sedimentary rocks of the Voirdye Formation and volcanic rocks of the Lac des Montagnes Group. At the contact with the Opatica Subprovince, marked by the Poste Shear Zone, the Lac des Montagnes Group forms a kilometer-thick strip >30 km long injected with mafic-ultramafic intrusive rocks assigned to the new Nasacauso mafic-ultramafic Suite. The southern part of the study area is in the Opatica Subprovince. There is a set of plutono-gneissic rocks of intermediate to felsic composition assigned to the Théodat Complex. A new unit identified as the Vilin migmatitic Suite has also been recognized within the Théodat Complex. Structurally, our work has extended eastward the Poste Albanel Shear Zone, which forms the boundary between the La Grande and Opatica subprovinces, as well as the Nisk Shear Zone, located between the LMB and the MBEGB. In the Opatica, the units located near the contact with the La Grande Subprovince are locally characterized by shallow dips, suggesting south-to-north thrusting.

2:50 p.m.

Geological context and origin of the metasomatic rocks of the Voirdye Formation, La Grande Subprovince, Eeyou Istchee James Bay, Québec

Conference details

Authors: Corentin Gardes (UQÀM), Stéphane De Souza (UQÀM), Lucie Mathieu (UQÀC), Daniel Bandyayera (MERN) and Emmanuel Caron-Côté (MERN)

3:05 p.m.

Geology of the Lac de la Marée area, Eeyou Istchee James Bay

Conference details

Authors: Daniel Bandyayera (MERN) and Emmanuel Caron-Côté (MERN)

3:20 p.m.

Geology of the Conviac Lake area, Eeyou Istchee James Bay.

Conference details

Authors: Myriam Côté-Roberge (MERN) and William Chartier-Montreuil (MERN)

A survey conducted during the summer of 2021 has led to the production of a new 1:50,000 scale geological map of the Conviac Lake area, located on the Eastmain River, ~100 km NE of Nemiscau. In particular, the mapping has clarified the boundary between the Opinaca and La Grande subprovinces in this area, shifting the contact ~30 km to the NE. Thus, the Moyenne and Basse-Eastmain Greenstone Belt (MBEGB), associated with the La Grande Subprovince, is extended eastward for about ten kilometers. The Natel Formation, composed of banded amphibolite of basaltic origin and felsic to intermediate tuff, as well as the nodular paragneiss and iron formations of the Auclair Formation, are found here. A new transitional unit of poorly metamorphosed layered paragneiss associated with the La Grande Subprovince, named the Prosper Formation, occupies the southernmost part of the map. Intrusive packages belonging to the Village Batholith, Pacific Intrusive Suite and Champion Complex cut these volcanic and sedimentary rocks. To the SE of the study area, paragneisses of the Voirdye Formation are cut by intrusive rocks of the Hutte Complex. Variably migmatitized paragneisses of the Laguiche Complex of the Opinaca Subprovince occupy the NE of the area. They are cut by felsic to intermediate intrusive rocks of the Bauerman Suite near the contact with the La Grande Subprovince. The region is cut by several roughly E-W trending shear zones, which in places follow the major regional shear corresponding to the contact between the La Grande and Opinaca subprovinces. To the SE, the Nisk Shear Zone separates the paragneisses of the Prosper Formation from those of the Voirdye Formation. The presence of dome and basin structures and a series of isoclinal folds characterize the tectonics of the region.

3:35 p.m.

Geology of the Cadet Lake area, Eeyou Istchee James Bay.

Conference details

Authors: Myriam Côté-Roberge (MERN) and William Chartier-Montreuil (MERN)

3:50 p.m.

Identification of a new komatiitic sequence in the Colomb-Chabouillé volcano-sedimentary belt, James Bay, Québec

Conference details

Authors: Pape Doudou Tague (UQÀC), Sarah-Jane Barnes (UQÀC), Daniel Bandyayera (MERN), Yannick Daoudene (MERN) and Philippe Pagé (IOS Services Géoscientifiques)

4:05 p.m.

New geochemical data from lake bottom sediments in the Eastmain River area, Eeyou Istchee James Bay.

Conference details

Author: Olivier Lamarche (MERN)