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Geology and structure of a sulfide-rich gold deposit; an example from the Mouska gold mine, Bousquet District, Canada

Abdelhay Belkabir and Claude Hubert
Geology and structure of a sulfide-rich gold deposit; an example from the Mouska gold mine, Bousquet District, Canada
Economic Geology and the Bulletin of the Society of Economic Geologists (August 1995) 90 (5): 1064-1079

Abstract

The Mouska mine in the Bousquet mining district represents a sulfide-rich gold deposit hosted by the Archean mafic metavolcanites of the Blake River Group, southern Abitibi greenstone belt. Mineralization shows both lithological and structural control and coincides with variably oriented high angle-reverse ductile and brittle-ductile shear zones. Host shear zones are superimposed on the regional foliation, and both appear to have formed from the same bulk stress field. Gold mineralization is composed of sulfide and quartz lodes and is associated with three distinct ore zones; each differs from the others by its style of veining and the nature of tectono-metamorphic overprint. Sulfide mineralization in this area varies from semimassive to massive sulfide lodes and dissemination. The strain features and age relationships of ore-bearing rocks and vein material throughout the ore zones display evidence of earlier sulfide mineralization with gold. This mineralization is pretectonic (with respect to the development of the foliation) and is interpreted as hydrothermal-synvolcanic. The auriferous quartz sulfide veins correspond to a multistage syn- to late tectonic mineralization and clearly crosscuts massive sulfide bodies. In the Mouska deposit, strain features and structural setting of gold mineralization show interactions between lithological factors, such as contacts, competency contrast and rock-body geometry, and the presence of pretectonic sulfides. In several parts of the mine volcanic sequence, the shear zone nucleation and development were controlled by both rock heterogeneities and the presence of soft sulfide bodies. The sulfides, in particular, were responsible for the structural instability recorded in some volcanic contacts and their activation as shear zones. In other parts, the sulfides have variably influenced the local slip movement. The shapes of ore shoots throughout the ore zones are variable and interpreted as reflecting the initial geometry of anisotropic interfaces involved in the deformation history.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 90
Serial Issue: 5
Title: Geology and structure of a sulfide-rich gold deposit; an example from the Mouska gold mine, Bousquet District, Canada
Affiliation: Universite de Montreal, Departement de Geologie, Montreal, QC, Canada
Pages: 1064-1079
Published: 199508
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 61
Accession Number: 1996-008584
Categories: Economic geology, geology of ore depositsStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. col., 1 table, geol. sketch maps
N46°00'00" - N50°30'00", W85°00'00" - W73°49'60"
N42°00'00" - N57°00'00", W95°00'00" - W74°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199604
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