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TitleContrasts in petrological features between Silurian-Devonian plutons in the Mira and Aspy terranes of Cape Breton Island, Nova Scotia: implications for porphyry-style mineralization
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMoning, A; Barr, S M; White, C E; van Rooyen, D
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 287-294, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2018 report of activities
File formatpdf
ProvinceNova Scotia
NTS11C/16; 11F/02; 11F/07
AreaCape Breton Island; Leonard MacLeod Brook
Lat/Long WENS -60.9667 -60.1667 46.3333 45.8333
Subjectseconomic geology; igneous and metamorphic petrology; geochemistry; geochronology; mineral deposits; porphyry deposits; copper; molybdenum; mineral exploration; ore mineral genesis; mineralization; ore controls; intrusions; plutons; tectonic setting; subduction zones; host rocks; bedrock geology; lithology; igneous rocks; intrusive rocks; granites; diorites; volcanic rocks; sedimentary rocks; shales; siltstones; whole rock geochemistry; radiometric dating; uranium lead dating; Gillis Mountain Pluton; Avalonia; Mira Terrane; Ganderia; Aspy Terrane; Gillis Brook Pluton; Easach Ban Pluton; Leonard MacLeod Brook Pluton; Big Barren Pluton; Bothan Brook Pluton; Phanerozoic; Paleozoic; Devonian; Silurian
Illustrationsgeoscientific sketch maps; photographs; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems - arc-related porphyry systems - time and space
Released2019 03 01
AbstractThe Devonian Gillis Mountain granitoid pluton in the Avalonian Mira terrane of southern Cape Breton Island hosts porphyry-style copper-molybdenum mineralization. In contrast, plutons of Silurian and Devonian age with similar rock types in the Leonard MacLeod Brook area of the Ganderian Aspy terrane of northern Cape Breton Island are not known to be mineralized. The Gillis Mountain pluton is calc-alkalic and likely formed as a result of slab failure in a subduction zone, whereas plutons in the Leonard MacLeod Brook area may have formed during within-arc extension followed by slab failure in the Devonian. Silurian plutons in the Leonard MacLeod Brook area are bimodal and intruded co-magmatic volcanic rocks, whereas the Devonian Gillis Mountain pluton intruded older shale and siltstone and is not associated with co-magmatic volcanic rocks.
Summary(Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI) is directed towards providing next generation knowledge and methods to facilitate more effective targeting of buried mineral deposits. The program aims to enhance the effectiveness of exploration for Canada's major mineral systems by resolving foundational geoscience problems that constrain the geological processes responsible for the liberation metals from their source region, transportation of these ore metals and control their eventual deposition. TGI supports projects on gold, Ni-Cr-PGE, porphyry-style mineralization, uranium and volcanic- and sedimentary-hosted base metal mineralization ore systems, with each project divided into subprojects focused on resolving specific knowledge gaps by integrating data and studies from multiple sites across Canada. Herein, we present interim results and interpretations from a selection of the research activities currently being conducted under the auspices of TGI.

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