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TitleNew U-Pb (zircon and monazite) ages and Sm-Nd isotopic data from granitoid plutons in the Aspy and Bras d'Or terranes of Cape Breton Island, Nova Scotia: implications for tectonic evolution and mineralization potential
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
Authorvan Rooyen, D; Barr, S M; White, C E
SourceTargeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 37-45, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Targeted Geoscience Initiative: 2017 report of activities, volume 1
File formatpdf
ProvinceNova Scotia
NTS11F/09; 11F/10; 11F/11; 11F/14; 11F/15; 11F/16; 11G/13; 11J/04; 11J/05; 11K; 11N/01; 11N/02
AreaCanadian Appalachians; Cape Breton Island
Lat/Long WENS -61.5000 -59.5000 47.2500 45.5000
Subjectseconomic geology; tectonics; geochronology; mineral deposits; mineral exploration; mineral potential; porphyry deposits; ore mineral genesis; ore controls; mineralization; whole rock analyses; isotopic studies; neodymium; radiometric dating; uranium lead dating; zircon; monazite; tectonic evolution; tectonic setting; magmatism; intrusions; plutons; dykes; sills; bedrock geology; lithology; igneous rocks; plutonic rocks; granitic rocks; granodiorites; diorites; granites; monzo-granites; volcanic rocks; andesites; dacites; tuffs; metamorphic rocks; orthogneisses; host rocks; basement geology; Ganderia; Aspy Terrane; Bras-d'Or Terrane; Appalachian Orogen; Price Point Formation; Margaree Pluton; Avalonia; Mira Terrane; Gillanders Mountain Pluton; Leonard MacLeod Brook Pluton; Jumping Brook Metamorphic Suite; Black Brook Granitic Suite; Phanerozoic; Paleozoic; Devonian; Silurian; Ordovician; Cambrian; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; tables; plots
ProgramTargeted Geoscience Initiative (TGI-5) Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5) Porphyry systems
Released2018 01 19
AbstractGranitoid plutons are widespread in the Ganderian Aspy and Bras d'Or terranes of Cape Breton Island and are diverse in composition, isotopic characteristics, and tectonic affinity. This study presents new U-Pb zircon ages from 10 previously undated plutons or their host rocks in the two terranes. The results range from Neoproterozoic (ca. 575 and 560 Ma in the Big Hill granodiorite and Price Point Formation), through Cambrian (ca. 515 and 510 Ma in Kellys Mountain diorite and granodiorite), Silurian (ca. 436 Ma in the Gillis Brook diorite, Gillanders Mountain granite, and ca. 420 Ma in the Leonard McLeod syenogranite), to Devonian (ca. 379 and 363 Ma in the Park Spur granite and Margaree pluton). Two samples were dated using U-Pb in monazite but the results for those were inconclusive and require further work. Overall the U-Pb zircon ages for samples presented here along with other recent work show a more complex magmatic history in the Bras d'Or and Aspy terranes than previously documented, and in particular more widespread Silurian magmatism. Epsilon-Nd data from this study shows that Bras d'Or and Aspy terrane rocks have negative epsilon-Nd values characteristic of Ganderia. These results show Aspy and Bras D'Or terranes likely share similar basement rocks, and are both isotopically distinct from Avalonia, which has mainly positive epsilon-Nd, and is represented in Cape Breton by the Mira terrane.
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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