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TitleThe relationship between the Ganderian Aspy and Bras d'Or terranes explored using Devonian plutonic rocks, Cape Breton, Nova Scotia
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AuthorGrant, C; Archibald, D B; Kellett, D A; Cottle, J M
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 279-286, https://doi.org/10.4095/313659 (Open Access)
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
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
NTS11K/09; 11K/10; 11K/15; 11K/16
AreaCape Breton Island
Lat/Long WENS -60.9167 -60.2500 47.0000 46.5000
Subjectseconomic geology; geochemistry; geochronology; mineral deposits; porphyry deposits; mineral exploration; ore mineral genesis; mineralization; ore controls; petrogenesis; intrusions; plutons; dykes; bedrock geology; lithology; granitic rocks; igneous rocks; intrusive rocks; granites; metamorphic rocks; gneisses; structural features; shear zones; kinematic analysis; whole rock geochemistry; major element analyses; trace element analyses; spectrometric analyses; geochemical anomalies; radiometric dating; uranium lead dating; zircon dates; lead lead dates; lead uranium ratios; isotopic studies; hafnium; host rocks; tectonic history; pressure-temperature conditions; emplacement; deformation; Ganderia; Aspy Terrane; Bras d'Or Terrane; Eastern Highlands Shear Zone; Black Brook Granite Suite; Appalachian Orogen; Peri-gondwanan Realm; Park Spur Granite; Cheticamp Lake Gneiss; White Point Granite; ore systems approach; protoliths; rare earth element analyses; Phanerozoic; Paleozoic; Devonian
Illustrationsgeoscientific sketch maps; photographs; Concordia diagrams; bar graphs; geochemical plots; plots; ternary diagrams
ProgramKnowledge Management Coordination, Targeted Geoscience Initiative (TGI-5)
ProgramIntrusion/Porphyry ore systems - arc-related porphyry systems - time and space, Targeted Geoscience Initiative (TGI-5)
Released2019 03 01
AbstractOn Cape Breton Island, Nova Scotia, the Eastern Highlands Shear Zone bisects the Ganderia composite terrane, separating the Aspy and Bras D'Or terranes. The shear zone displays east-over-west, sinistral kinematics, and is intruded and stitched by plutonic rocks of the Devonian Black Brook Granite Suite. This study is utilizing whole rock geo-chemistry, U-Pb zircon geochronology and Hf isotopic analysis to constrain the petrogenesis of the Black Brook Granite Suite and other spatially associated granitoid plutons in northern Cape Breton. The granitoid-dominated plutonic suite is peraluminous, muscovite- and biotite-bearing, and interpreted to have formed from crustal anatexis. Published U-Pb monazite ages have constrained emplacement of the granite suite to ca. 375 Ma. Our new zircon geochronological data yielded weighted-mean U-Pb ages between ca. 396 and 399 Ma, but individual zircon grains recorded younger ages in all samples. Our interpretation is that many of the analyzed zircon grains are inherited from host rocks and/or protolith, or that the pressure-temperature conditions of the magma were only hot enough to grow long, slender zircon crystals not analyzed in this study. Thus, we interpret the timing of granitoid emplacement to be ca. 375 Ma. These results situate post-collisional plutonic rocks in northern Cape Breton Island in the temporal history of the Appalachian Orogen and can be used to constrain timing of deformation on the Eastern Highlands Shear Zone.
GEOSCAN ID313659