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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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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)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
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; ore systems approach; arc extension; slab failure; 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.