| Title | New 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 |
| Download | Download (whole publication) |
| Author | van Rooyen, D; Barr, S M; White, C E |
| Source | Targeted Geoscience Initiative: 2017 report of activities, volume 1; by Rogers, N (ed.); Geological Survey of Canada, Open File 8358, 2018 p. 37-45, https://doi.org/10.4095/306404 (Open Access) |
| Year | 2018 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Rogers, N; (2018). Targeted
Geoscience Initiative: 2017 report of activities, volume 1, Geological Survey of Canada, Open File 8358 |
| File format | pdf |
| Province | Nova Scotia |
| NTS | 11F/09; 11F/10; 11F/11; 11F/14; 11F/15; 11F/16; 11G/13; 11J/04; 11J/05; 11K; 11N/01; 11N/02 |
| Area | Canadian Appalachians; Cape Breton Island |
| Lat/Long WENS | -61.5000 -59.5000 47.2500 45.5000 |
| Subjects | economic 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; ore systems approach; syenogranites; rare earth elements; Phanerozoic; Paleozoic;
Devonian; Silurian; Ordovician; Cambrian; Precambrian; Proterozoic |
| Illustrations | geoscientific sketch maps; tables; plots |
| Program | Targeted
Geoscience Initiative (TGI-5), Knowledge Management Coordination |
| Program | Targeted
Geoscience Initiative (TGI-5), Porphyry systems |
| Released | 2018 01 19 |
| Abstract | Granitoid 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. |
| GEOSCAN ID | 306404 |
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