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TitleAr/Ar thermochronology of the Aspy and Bras d'Or terranes, Cape Breton Island, Nova Scotia
DownloadDownload (whole publication)
AuthorKellett, D A; Barr, S M; van Rooyen, D; 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. 47-49, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2018). Targeted Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358
File formatpdf
ProvinceNova Scotia
NTS11K/01; 11K/02; 11K/07; 11K/08; 11K/09; 11K/10; 11K/15; 11K/16
AreaCanadian Appalachians; Cape Breton Island
Lat/Long WENS -61.0000 -60.0000 47.2500 46.0000
Subjectseconomic geology; tectonics; geochronology; mineral deposits; mineral exploration; mineral potential; porphyry deposits; ore mineral genesis; ore controls; mineralization; argon argon dates; muscovite; hornblende; biotite; tectonic evolution; tectonic setting; magmatism; orogenesis; thermal history; metamorphism, regional; deformation; recrystallization; intrusions; plutons; bedrock geology; lithology; igneous rocks; plutonic rocks; granitic rocks; granites; diorites; granodiorites; tonalites; metamorphic rocks; orthogneisses; gneisses; Ganderia; Aspy Terrane; Bras-d'Or Terrane; Appalachian Orogen; Chéticamp Plutonic Belt; Eastern Highlands Shear Zone; ore systems approach; Phanerozoic; Paleozoic; Carboniferous; Devonian; Silurian; Ordovician; Cambrian; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Porphyry systems
Released2018 01 19
AbstractThe distribution of magmatic rocks through time within the Appalachian orogen suggests a tectonic control on magma generation. Cape Breton Island preserves a condensed yet complete record of the main tectonic units and magmatic suites of the Appalachian orogen. Here we present new 40Ar/39Ar cooling ages for muscovite from the Aspy terrane, a component of Ganderia preserved in western Cape Breton Island. The preliminary results show that this terrane cooled through muscovite closure temperatures during the Middle Devonian following regional metamorphism. Rocks from the southern Chéticamp plutonic belt of Aspy were not heated sufficiently during regional metamorphism to reset 40Ar in muscovite. These results will contribute to a reconstruction of the tectonic and structural history of the Ganderian elements of the Appalachian orogen.