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TitleSulphide clast-bearing felsic volcaniclastic units of the Rouyn-Pelletier Formation: comparison with similar units of the Horne Block, Rouyn-Noranda, Abitibi greenstone belt, Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorBoudreau, C; Mercier-Langevin, P; Krushnisky, A; Goutier, J
SourceTargeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems; by Mercier-Langevin, P (ed.); Lawley, C J MORCID logo (ed.); Castonguay, SORCID logo (ed.); Geological Survey of Canada, Open File 8712, 2020 p. 45-56, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative 5: contributions to the understanding of Canadian gold systems
File formatpdf
NTS32D/02; 32D/03; 32D/06; 32D/07
Lat/Long WENS -79.0367 -78.8911 48.3306 48.2469
Subjectseconomic geology; stratigraphy; geochemistry; Science and Technology; Nature and Environment; Archean; mineral deposits; gold; base metals; precious metals; volcanogenic deposits; sulphide deposits; silver; copper; zinc; lead; mineral exploration; exploration guidelines; ore mineral genesis; mineralization; ore controls; greenstone belts; bedrock geology; lithology; igneous rocks; volcanic rocks; felsic volcanic rocks; mafic volcanic rocks; volcaniclastics; hyaloclastites; clasts; lava flows; breccias; tuffs; rhyolites; basalts; andesites; intrusive rocks; diabases; syenites; trondhjemites; tonalites; gabbros; diorites; mafic intrusive rocks; structural features; faults; mineral assemblages; pyrite; sphalerite; chalcopyrite; host rocks; stratigraphic correlations; facies; lithogeochemistry; geochemical analyses; trace element analyses; major element analyses; tectonic setting; intrusions; dykes; deformation; foliation; hydrothermal alteration; depositional environment; Abitibi Greenstone Belt; Blake River Group; Rouyn-Pelletier Formation; Horne Formation; Noranda Formation; Horne Block; Andesite Fault; Horne Deposit; Noranda Camp; Precambrian
Illustrationslocation maps; geoscientific sketch maps; photographs; photomicrographs; plots
ProgramTargeted Geoscience Initiative (TGI-5) Gold ore systems
Released2020 06 11; 2023 03 17
AbstractSulphide clast-bearing volcaniclastic units are a key exploration vector towards volcanogenic massive sulphide deposits. These marker units are commonly associated with base and precious metal-rich volcanogenic massive sulphide deposits of the Archean Abitibi greenstone belt. One such sulphide (pyrite ±sphalerite-chalcopyrite) clast-bearing felsic volcaniclastic unit is present in the uppermost part of the Rouyn-Pelletier Formation of the Blake River Group in Rouyn-Noranda. The Rouyn-Pelletier Formation is in faulted contact (Andesite fault) with the rocks of the Horne Formation, which are of the same age and style, are sulphide clast-bearing, and host to the giant Horne Au-rich volcanogenic massive sulphide deposit. This raises the question of a possible stratigraphic correlation between the Rouyn-Pelletier (upper part) and Horne formations, with the potential for major implications for exploration in the Rouyn-Pelletier Formation.
The study area is composed of broadly coeval extrusive felsic facies with mafic to intermediate extrusive and intrusive facies. Felsic units range from flows with lobate, flow banding and in situ brecciated textures to dominantly sulphide clast-bearing volcaniclastic units with tuff breccia, lapilli tuff and lesser tuff facies. Rocks of the upper portion of the Rouyn-Pelletier Formation and the Horne Block are of similar age and show similarities in volcanic facies. However, there are subtle but significant geochemical differences that suggest that it may not be possible to directly correlate their stratigraphy. The uppermost Rouyn-Pelletier Formation could represent a distal, poorly mineralized equivalent to the Horne West or Horne 5 zones, or it could be an unrelated succession.
Summary(Plain Language Summary, not published)
The main objective of phase 5 (2015-2020) of Natural Resources Canada and Geological Survey of Canada's Targeted Geoscientific Initiative (TGI) program was to generate new knowledge, methodologies and models to enhance the exploration industry's ability to detect buried ore deposits. This synthesis volume contains 20 individual papers that discuss craton to deposit-scale characteristics of auriferous deposits, plus some support material pertaining to the TGI-5 Gold project.

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