The Nature of the Contact Between the Blake River and the Kewagama Groups.
Published:January 01, 1991
Sylvain Lacroix, Jacques Landry, 1991. "The Nature of the Contact Between the Blake River and the Kewagama Groups.", Control on Base Metal and Gold Mineralizations, Bousquet—Rouyn-Noranda Area, G. Tourigny, P. Verpaelst
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This stop presents the northern contact of the volcanic rocks of the Blake River Group with the sedimentary rocks of the Kewagama Group. The nature of this contact is highly debated. It is concordant but locally faulted in a homoclinal sequence with tops to the SW from the Kewagama Group to the Blake River Group, following the interpretations of Dimroth et al. (1982) and Macintosh (1977). However, according to Hubert et al. (1984) and Tourigny and Hubert (1986), this contact is non concordant and coincides with the Lac Parfouru fault.
A remarquable exposure in a N-S section along the power transmission line enables us to observe the exact nature of this contact in the Destor township (Fig. 10). The data presented here are taken from a regional mapping of this area realized in 1989 (Lacroix et Landry, 1991). In the Destor township, the Kewagama Group has a N-S apparent width of 100 m and is bordered to the north by the Porcupine-Destor fault and to the south by the Blake River contact, both trending WNW-ESE. The section will begin in the Blake River Group and continue to the north up to the contact with the sediments of the Kewagama Group.
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Control on Base Metal and Gold Mineralizations, Bousquet—Rouyn-Noranda Area*
The Archean Abitibi belt is one of the largest and most studied greenstone terranes in the world. This is due not only to its precious and base meta 1 production, but also to its excellent bedrock exposure which permits observation of many Archean geological features in the south part of the belt lying between Rouyn-Noranda and Val d'Or.
The main objective of the regional field trips and the mine visits is to present the rna in stratigraphic, st ructura 1 and ore characteristics of the southern part of the Abitibi Belt. This regional field trip is scheduled to cover the Rouyn-Noranda and Cadi 11 ac-Bousquet mining camps. Operating mines will also be visited: Francoeur, Pierre-Beauchemin, Ansil, Mobrun, Doyon and Bousquet. The delegates will be able to examine the main volcanic, plutonic and sedimentary rocks as well as the various structural features in this part of the Abitibi. Ore deposits will include both massive sulphide and gold deposits. The various geological and structural environments of these deposits will also be examined.
The southern part of the Abitibi Belt in Quebec is dominated by a prominent deformation corridor, the Cadillac-Larder Lake Fault Zone. This zone is oriented E-W and separates a volcanic domain in the north from an essentially sedimentary domain in the south. This sedimentary domain, comprising clastic rocks and various granitic complexes, belongs to the Pontiac Subprovince. The volcanic domain is composed of various “blocks” of volcanic assemblages intruded by granitic masses, separated from one another by fault zones, discordances and inear sedimentary units. On the regional scale, the imbricated volcanic “blocks” are lozenge-shaped, with E-W orientd long axes. In most cases, the relationships between these volcanic and sedimentary “blocks” remain ambiguous.