THE BLAKE RIVER GROUP, ROUYN-NORANDA AREA, QUEBEC: A STRATIGRAPHIC SYNTHESIS

The Archean Blake River Group is best known from a central volcanic complex in Rouyn-Noranda. This volcano-tectonic depression, delimited by the Hunter Creek fault to the north and the Horne Creek fault to the south, is interpreted to be a cauldron approximately 20 km in diameter. Its western and eastern boundaries are the Flavrian Plutonand the D'Alembert shear zone respectively. The complex has an exposed stratigraphic thickness of 10.5 km. Two cycles, composed of andesitic units overlain by bimodal, andesite - rhyolite units, are observed in the area, and are, in turn, overlain by an andesitic unit interpreted to be the lower part of a third cycle. The southern sector of the Blake River Group, south of the central volcanic complex, is considered to be outside the limits of the cauldron, but partly contemporaneous with it. The maximum stratigraphic thickness exposed in this area is 4 .6 km. At least two cycles occur in this sector. The oldest unit, a pre-cauldron andesitic to basaltic unit, occurs only in the southern part of the sector. In the north, two partial andesite - bimodal cycles, interpreted as contemporaneous with the cauldron volcanism, are observed. The eastern sector of the Blake River Group, east of the central volcanic complex, apparently overlies the complex. Two units are observed in this sector: a lower bimodal unit and an uper andesitic unit. The bimodal unit is coupled with the uppermost andesitic unit of the central volcanic complex to form a cycle, and the andesitic unit is considered to be the uppermost unit of the Blake River Group. The total exposed stratigraphic thickness in the sector is 2.5 km. The western sector of the BlakeR iver Group, north and west of the central volcanic complex, is interpreted as the lateral equivalent of the complex. Three andesite - bimodal cycles are exposed in this sector, giving a total stratigraphic thickness of 9.5 km. The two lower cycles correspond directly to the central volcanic complex cycles; this correlation is facilitated by two stratigraphic marker units observed on either side of the Hunter Creek fault: the Fish-roe rhyolite flow, east of the Flavrian pluton, and a spherulitic rhyolite lapilli-tuff, west of the Flavrian pluton.
Many of the volcanogenic massive sulphide deposits found in the central volcanic complex are spatially and temporally associated with synvolcanic faults, and felsic domes and feeder dykes that are the sites of felsic volcanism in the bimodal units. However, these features also occur outside the central volcanic complex, and the similarities recognized in this work between the complex and the surrounding area suggest that such deposits need not be restricted to the central volcanic complex. The presence of volcanogenic massive sulphide deposits outside the complex confirms this.

Le Groupe de Blake River, d' age archeen, est surtout connu pour son complexe volcanique central, dans la region de Rouyn-Noranda. Ce complexe correspond a une depression volcano-tectonique delimitee par la faille de Hunter Creek au nord, et par la faille de Horne Creek au sud. Cette depression de 20 km de diametre environ est interpretee comme un chaudron. Ses limites est et ouest sont respectivement la zone de cisaillement de D'Alembert et le Pluton de Flavrian. Le complexe a une epaisseur stratigraphique exposee de 105 km. Deux cycles complets sont observes dans le complexe. Chaque cycle est compose d' une unite andesitique suivie d'une sequence bimodale d'unites andesitiques et rhyolitiques. Ces deux cycles sont surmontees d' une autre unite andesitique, consideree comme la base d'un troisieme cycle. Le secteur sud du groupe, au sud du complexe central, est considere comme etant a l' exterieur du chaudron, mais en partie contemporain a sa formation. Il y a au moins deux cycles volcaniques dans ce secteur. L'unite la plus ancienne, de composition andesitique a basaltique, est anterieure au chaudron et n' affleure que dans la partie sud du secteur. Au Nord, on observe deux cycles andesite - sequence bimodale qui n' afjleurent qu' en partie et qui seraient contemporains a laformation du chaudron. Le secteur est du groupe semble stratigraphiquement au-dessus du complexe central. On y observe deux unites: une sequence bimodale inferieure qui, avec l'unite andesitique sommitale du complexe central, constitue le premier cycle, et une unite andesitique epaisse qui est consideree comme l'unite sommitale du Groupe de Blake River. L' epaisseur stratigraphique dans le secteur est de 2.5 km. Le secteur ouest, comprenant les unites au nord et a l' ouest du complexe central, est interprete comme l' equivalent lateral du complexe. Trois cycles andesite - sequence bimodale y afleurent pour donner une epaisseur stratigraphique totale de 9.5 km. Les deux cycles inferieurs correspondent directement aux cycles du complexe central; cette correlation est rendue possible grace a deux unites reperes qui affleurent de part et d'autre de lafaille de Hunter Creek: la rhyolite de Fish-roe a l'est du Pluton de Flavrian, et un tufa lapilli spherolitique de composition rhyolitique, a l'ouest du pluton. Plusieurs gisements de sulfures volcanogenes du complexe volcanique central sont associes dans le temps et dans l' espace a des failles syn-volcaniques, a des domes et a des dykes nourriciers felsiques qui sont le site de volcanisme felsique dans les unites bimodales. Cependant, ces caracteristiques sont aussi presentes a l' exterieur du complexe central, et les ressemblances notees entre le complexe et les secteurs environnants suggerent que ce type de depots n'est pas restreint au complexe volcanique.
Keywords: Stratisgraphy, Stratisgraphic synthesis, Rouyn-Noranda, Volcano-tectonic depression, Blake River Group, Stratisgraphie, Synthese stratisgraphique, depression volcano-tectonique
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Publication: Special Volume
Author(s): Pierre Pilote, Jayanta Guha, Real Daigneault: Universite du Quebec a Chicoutimi, 555 boul. Universite, Chicoutimi, Quebec; Francois Robert: Geological Survey of Canada, 601 Booth St., Ottawa, Ontario; Jean-Yves Cloutier: Les Mines Casa-Berardi, 21A Seme ave. Est, La Sarre, Quebec; J. Paul Golightly: Inco Gold, J. Roy Gordon Research Laboratory, Sheridan Park, Mississauga, Ontario
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Author(s): Michel Boily, Anthony E. Williams-Jones and T. Mulja: IREM-MERI and Department of Geological Sciences, McGill University, 3450 University Street, Montreal, Canada; Pierre Pilote: Ministere de l'Energie et Ressources, Service Geologique du Nord Ouest, 400 Boul Lamaque, Val D'Or, Quebec, Canada
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Author(s): Michel Rocheleau, Rejean Hebert, Pierre St-Julien, M. Racine: Departement de Geologie, Universite Laval, Quebec; Roch Gaudreau: Les Mines Selbaie, C.P. 370, Joutel, (Quebec); Pierre Lacoste: Le Centre de recherches minerales, 2700 rue Einstein, Sainte-Foy, (Quebec)
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Author(s): Francois Robert: Geological Survey of Canada, 601 Booth St., Ottawa, Canada; Rex Brommecker: Dept. of Earth Sciences, University of Waterloo, Waterloo, Ontario
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Publication: Special Volume
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Volume: SV 43
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Volume: SV 43
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Publication: Special Volume
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Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: From 1927 to 1989, the Horne mine produced 53.7 Mt of ore grading 6.1 glt Au and 2.2% Cufrom two large volcanogenic massive sulphide deposits composed primarily of pyrrhotite, pyrite and chalcopyrite. The orebodies were hosted by a package of chlorite-sericite altered epiclastic rhyolite tuffs which were deposited in a narrow palaeo-graben located on the flank of a major felsic volcanic centre. Mineralizingfluids percolated upward through the permeable footwall rocks and were further focussed...
Publication: Special Volume
Author(s): David J, Kerr and Robert Mason, Department of Geological Sciences, Queen's University, Kingston, Ont., Canada
Keywords: Horne Mine, Mineralization, Ore deposits,Rouyn-Noranda, Mine Horne
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: Mine Gallen is a zinc-rich pyritic volcanogenic massive sulphide deposit that occurs in a fault-bounded block of intermediate volcanic rocks. The block is completely surrounded at the present erosion level by the eastern part of the Lac Dufault granodiorite. The volcanic succession includes a massive feldspar porphyry that is probably a subvolcanic intrusion, an andesitic flow unit and lapilli tuffs. The latter are variably sericitized and pyritic, especially in the vicinity of the massive...
Publication: Special Volume
Author(s): David H. Watkinson, John McEwen and Ian R. Jonasson
Department of Earth Sciences, Carleton University, Ottawa-Carleton Geoscience Centre, Ottawa
Keywords: Geology, Mine Gallen, Noranda, Massive sulphide mound, Subvolcanic intrusion, Geologie, Sulphures massifs, Massif sub-volcanique
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: The Eastern Abitibi Subprovince (Quebec segment), contains two main types of gold deposits: the common quartz-vein type and the rare pyritic type. Both occur in areas dominated by volcanic rocks and are spatially associated with major fault zones. Quartz-vein gold deposits consist of simple to complex networks of quartz-carbonate-pyrite veins in reverse shear zones and extensional fractures. They occur in areas dominated by mafic volcanic rocks and are commonly associated with small syn-to-la...
Publication: Special Volume
Author(s): Francois Robert, Mineral Resources Division, Geological Survey of Canada 601 Booth St., Ottawa,
Keywords: Gold, Gold deposits, Abitibi, Quartz-vein, Rare pyritic, Fault zone, Or, Gites d'or, Veine de quartz, Pyriteux de types rare
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: The Abitibi volcano-plutonic belt forms the major portion of the Abitibi lithotectonic subprovince in the Superior Province. The Abitibi belt is composed essentially of" ( 1) approximately 2.7 Ga old volcanic and sedimentary rocks; and (2) gabbro, tonalite, granodiorite
and syenite intrusions occurring in well-defined prekinematic ( synvolcanic ), synkinematic and post-kinematic plutonic suites. Most of these rocks are metamorphosed to greenschist facies. Regional multi-phase deformation...
Publication: Special Volume
Author(s): Alain Simard, Andre Gobeil, Pierre Verpaelst, Maurice Rive, Sylvain Lacroix and Denis Racicot; Service Geologique du Nord-Ouest, Ministere d,energie et des Ressources du Quebec
Keywords: Geology, Geologic domains, Quebec, volcano-plutonic belt, granitic batholiths, mines.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: Un trait marquant du cadre tectonostratigraphique de la Sous province de l'Abitibi est la presence de nombreux couloirs de deformation d' extension regionale et sub-concordants au grain stratigraphique. La presence de grandes masses granitoides qui perturbent l' allure du grain tectonique est typique de la partie nord de la Sous province de l'Abitibi. Des rides E-W constituees de complexes plutoniques precoces forment des reliefs structuraux agissant comme
des moles resistants qui interferent...
Publication: Special Volume
Author(s): Real Daigneault et Guy Archambault; CERM/Universite du Quebec a Chicoutimi, 555 boul. de l'Universite, Chicoutimi, Qc,
Keywords: Deformation, Abitibi, Quebec, Failles ductiles, Mines
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: L'Abitibi quebecois a produit essentiellement de l' or, du cuivre, du zinc et de I' argent, ainsi que de faibles quantites de nickel, de plomb, de molybdene, de bismuth, de lithium, de fer et d' amiante. Depuis l' ouverture de la mine Horne en 1927, cent-cinquante mines ont contribue a la production de 1 420 tonnes d' or. de 4,1 millions de tonnes de cuivre et de 4,7 millions de tonnes de zinc. Les productions minieres annuelles ont ete d'importance variable: des records de
production ont ete...
Publication: Special Volume
Author(s): Denis Racicot; Ministere de l'Energie et des Ressources -Quebec
Keywords: Geologie, Production miniere, Abitibi, Quebec, Mines
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: The Ansil deposit is located in the Noranda mining camp in the southern part of the Abitibi greenstone belt. It was discovered in 1981 and production began in 1989 with proven reserves of 1.58 Mt grading 7.2% copper, 0.9% zinc, 26.5 glt of silver and 1.6 glt of gold. It is centered at a depth of 1.3 kilometre and represents one of the deepest ore discoveries ever made from surface.
The deposit consists of a single massive sulphide lens located at the contact between the Northwest Rhyolite and...
Publication: Special Volume
Author(s): Gerald Rlverln, Michel LaBrie, Bernard Salmon, Alain Cazavant, Rem! Asselin, Marlo Gagnon, Minnova Inc., C.P. 2000, Rouyn-Noranda, Quebec,
Keywords: Ansil deposit, Noranda Mining Group, Rouyn-Noranda, Abitibi gemstone belt, Lens, metal distribution, Gisement Ansil, Camp Minier Noranda, Ceinture de l'Abitibi, Lentille, Distribution des metaux.
Issue: 1990
Volume: SV 43
Year: 1990
Text
Summary: Quelques soixante-dix sept plutons pntsenls dans la Sous-Province de Pontiac et dans Ia partie centrale de la Sous-Province de l'Abitibi ont fait l'objet d' une reconnaissance systbnatique. Ils ont ete regroupes en huit suites plutoniques majeures et trois suites mineures a partir de criteres geologiques et petrologiques. Parmi les suites majeures, quatre represenlent l'activite intrusive la plus ancienne dans la region. L'une d'entre elles est representee par deux complexes
anorthosito-gabbr...
Publication: Special Volume
Author(s): Maurice Rive, Service Geologique du Nord-Ouest Quebec, MERQ, 19, rue Perreault Ouest, Rouyn-Noranda, Quebec, Canada; Pintson, Hillar and Ludden, John N.
Institut de Recherche en Exploration Minerale, Department de Geologic, Universite de Montreal, C.P. 6128, Succ. A, Montreal, Quebec, Canada
Keywords: Plutonic rocks, Abitibi, Pontiac, Superior Province, Plutons, Geologie, Petrologie
Issue: 1990
Volume: SV 43
Year: 1990
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