ror.org/00839we02
Résumés
Abstract
The Park Spur pluton was emplaced in the Aspy terrane of the central Cape Breton Highlands at 374.2 ± 2.9 Ma (U–Pb zircon). It consists mainly of muscovite-biotite monzogranite with small areas of garnet-bearing muscovite monzogranite and abundant pegmatite and aplite dykes. On its northern margin the pluton intruded metamorphic rocks of the Ordovician–Silurian Cape North Group and associated orthogneiss and on the south it intruded low-grade metamorphic rocks of the Silurian Calumruadh Brook Formation. Deformation along the southern margin of the Park Spur pluton is consistent with emplacement during dextral transpression between the Bras d’Or and Aspy terranes. The Late Devonian age combined with S-type petrological characteristics show that the Park Spur pluton and nearby Canal pluton are related to the ca. 375 Ma Black Brook Granitic Suite, all interpreted to have been emplaced during later stages of the Acadian orogeny in Ganderia as a result of delamination.
Résumé
La mise en place du pluton Park Spur à l’intérieur du terrane Aspy dans le centre des Hautes-Terres-du-Cap-Breton remonte à 374,2 ± 2.9 Ma (datation U–Pb sur zircon). Le pluton est essentiellement constitué de monzogranite à deux micas comportant de petites sections de monzogranite à muscovite grenatifère et une abondance de dykes pegmatitiques et aplitiques. Sur sa bordure septentrionale, le pluton a pénétré des roches métamorphiques du groupe ordovicien-silurien de Cape North et de l’orthogneiss associé, alors qu’il a pénétré au sud des roches faiblement métamorphisées de la Formation silurienne de Calumruadh Brook. La déformation le long de la bordure méridionale du pluton Park Spur correspond à une mise en place durant la transpression dextre survenue entre les terranes Bras d’Or et Aspy. L’âge du Dévonien tardif conjugué aux caractéristiques pétrologiques supracrustales révèle que le pluton Park Spur et le pluton Canal voisin sont apparentés à la suite granitique d’environ 375 Ma du ruisseau Black, tous interprétés comme des éléments s’étant mis en place au cours des stades tardifs de l’orogenèse acadienne dans Ganderia à la suite d’une délamination.
Parties annexes
Bibliography
- Abart, R., Heuser, D., and Habler G. 2014. Mechanisms of myrmekite formation: case study from the Weinsberg granite, Moldanubian zone, Upper Austria. Contributions to Mineralogy and Petrology, 168, pp. 1–15. https://doi.org/10.1007/s00410-014-1074-7
- Abdel-Rahman, A.M. 1994. Nature of biotites from alkaline, calc-alkaline, and peraluminous magmas. Journal of Petrology, 35, pp. 525–541. https://doi.org/10.1093/petrology/35.2.525
- Anderson, T. 2002.Correction of common lead in U–Pb analyses that do not report 204Pb. Chemical Geology, 192, pp. 59–79. https://doi.org/10.1016/S0009-2541(02)00195-X
- Archibald, D.B., Barr, S.M., Murphy, J.B., White, C.E., MacHattie, T.G., Escarraga, E.A., Hamilton, M.A., and McFarlane, C.R.M. 2013. Field relationships, petrology, age, and tectonic setting of the Ordovician West Barneys River Plutonic Suite, southern Antigonish Highlands, Nova Scotia, Canada. Canadian Journal of Earth Sciences, 50, pp. 727–745. https://doi.org/10.1139/cjes-2012-0158
- Azadbakht, Z., Rogers, N., Lentz, D.R. and McFarlane, C.R.M., 2019. Petrogenesis and associated mineralization of Acadian related granitoids in New Brunswick. In Targeted Geoscience Initiative: 2018 report of activities. Edited by N. Rogers. Geological Survey of Canada, Open File 8549, p. 243–278. https://doi.org/10.4095/313658
- Baldwin, G. 2019. The Highlands Gold occurrences, eastern Cape Breton Highlands, Nova Scotia: an unrecognized IOCG district? Abstract in Abstracts, GAC-MAC-IAH Joint Annual Meeting, Quebec City, May 12–15, p. 58.
- Barr, S. M. and Jamieson, R. A. 1991. Tectonic setting and regional correlation of Ordovician– Silurian rocks of the Aspy terrane, Cape Breton Island, Nova Scotia. Canadian Journal of Earth Sciences, 28, pp. 1769–1779. https://doi.org/10.1139/e91-158
- Barr, S.M. and Raeside, R.P. 1986. Pre-Carboniferous tectonostratigraphic subdivisions of Cape Breton Island, Nova Scotia. Maritime Sediments and Atlantic Geology, 22, pp. 252–263. https://doi.org/10.4138/1610
- Barr, S. M. and Raeside, R. P. 1989. Tectono-stratigraphic terranes in Cape Breton Island, Nova Scotia: implications for the configuration of the northern Appalachian orogen. Geology, 17, pp. 822–825. https://doi.org/10.1130/0091-7613(1989)017<0822:TSTICB>2.3.CO;2
- Barr, S.M. and White, C.E. 2017a. Bedrock geology map of the Cheticamp River area, NTS 11K/10, Inverness and Victoria Counties, Nova Scotia. Nova Scotia Department of Natural Resources, Geoscience and Mines Branch. Open File Map ME 2017-026, scale 1:50 000, 1 sheet.
- Barr, S. M. and White, C. E. 2017b. Bedrock geology legend for Cape Breton Island, Nova Scotia; Nova Scotia Department of Natural Resources, Geoscience and Mines Branch, Open File Illustration ME 2017-001.
- Barr, S.M., Jamieson, R.A., and Raeside, R.P. 1992. Northern Cape Breton Island. Department of Energy, Mines and Resources Canada. Geological Survey of Canada Map 1752A, scale 1:100 000, 1 sheet.
- Barr, S.M., White, C.E., and Ketchum, J.W.F. 2012. The Cape Porcupine Complex, northern mainland Nova Scotia – no longer a geological orphan. Atlantic Geology, 48, pp. 70–85. https://doi.org/10.4138/atlgeol.2012.004
- Barr, S.M., van Rooyen, D., and White, C.E. 2018. Granitoid plutons in peri-Gondwanan terranes of Cape Breton Island, Nova Scotia, Canada: new U–Pb (zircon) age constraints. Atlantic Geology, 54, pp. 21–80. https://doi.org/10.4138/atlgeol.2018.002
- Chappell, B.W. and White, A.J.R. 1974. Two contrasting granite types. Pacific Geology, 8, pp. 173–174.
- Dunning, G.R., Barr, S.M., Raeside, R.P., and Jamieson, R.A. 1990. U–Pb zircon, titanite, and monazite ages in the Bras d'Or and Aspy terranes of Cape Breton Island, Nova Scotia: Implications for igneous and metamorphic history. Geological Association of America Bulletin 102, pp. 322–330. https://doi.org/10.1130/0016-7606(1990)102<0322:UPZTAM>2.3.CO;2
- Ethier, M. 2001. Re-interpretation of the geology of the Cape Breton Highlands using combined remote sensing and geologic databases. Unpublished MSc thesis, Acadia University, Wolfville, Nova Scotia, 126 p.
- Gibson, D., Barr, S.M., van Rooyen, D., White, C.E., and Pilote, J-L. 2021. Protracted intra- and inter-pluton magmatism during the Acadian orogeny: evidence from new LA-ICP-MS U–Pb zircon ages from northwestern Maine, USA. Atlantic Geology, 57, pp. 147–191. https://doi.org/10.4138/atlgeol.2021.008
- Grant, C. 2018. Investigating the relationship between the Bras d’Or and Aspy Terranes in Cape Breton Island: Insights from Devonian plutonic rocks. Unpublished BSc thesis, Saint Francis Xavier University, Antigonish, Nova Scotia, 60 p.
- Grant, C. 2020. Petrological and U–Pb zircon age constraints for metamorphic rocks of the northeastern Cape Breton Highlands, Nova Scotia: New insights into the geological history of the Aspy terrane. Unpublished MSc thesis, Acadia University, Wolfville, Nova Scotia, 244 p.
- Grant, C., Archibald, D.B, Kellett, D.A., and Cottle, J.M. 2019. The relationship between the Ganderian Aspy and Bras d’Or terranes explored using Devonian plutonic rocks, Cape Breton, Nova Scotia. In Targeted Geoscience Initiative: 2018 report of activities. Edited by N. Rogers. Geological Survey of Canada, Open File 8549, pp. 279–286. https://doi.org/10.4095/313659
- Hibbard, J.P., van Staal, C.R., Rankin, D.W., and Williams, H. 2006. Lithotectonic map of the Appalachian orogen, Canada - United States of America: Geological Survey of Canada Map 02096A, 2 sheets, scale 1:1 500 000. https://doi.org/10.4095/221912
- Hildebrand, R.S. and Whalen, J.B. 2014. Arc and slab-failure magmatism in Cordilleran batholiths II – The Cretaceous Peninsular Ranges Batholith of Southern and Baja California. In Stirring the Pot, A Celebration of the Career of Paul F. Hoffman. Edited by J.B. Murphy, R.S. Hildebrand, and G.P. Halverson. Geoscience Canada, Reprint Series, 11, pp. 239–267. https://doi.org/10.12789/geocanj.2014.41.059
- Horne, R.J., Dunning, G.R., and Jamieson, R.A. 2003. U–Pb age date for the Belle Côte Road orthogneiss, Taylors Barren pluton, and Bothan Brook pluton, southern Cape Breton Highlands (NTS 11K/10, 11K/11): igneous ages and constraints on the age of host and deformational history. In Mineral Resources Branch, Report of Activities 2002. Nova Scotia Department of Natural Resources Report 2003-1, pp. 57–68.
- Hutchinson, C.S. 1974. Laboratory handbook of Petrographic techniques. Wiley Interscience, New York, 527 p.
- Jamieson, R.A., Tallman, P., Marcotte, J.A., Plint, H.E., and Connors, K.A. 1987. Geology of the west-central Cape Breton Highlands, Nova Scotia: Geological Survey of Canada, Paper 87-13, 11 p. https://doi.org/10.4095/122381
- Kontak, D.J. and Smith, P.K. 1997. The age and nature of hydrothermal activity effecting auriferous quartz vein mineralization in the Cape Breton Highlands, Nova Scotia. Nova Scotia. In Report of Activities 1996. Edited by D. MacDonald and K.A. Mills. Department of Natural Resources, Minerals and Energy Branch, pp. 111–114.
- Lin, S. 1994. Relationship between the Aspy and Bras d’Or “terranes” in the northeastern Cape Breton Highlands, Nova Scotia: Reply. Canadian Journal of Earth Sciences, 31, pp.1385–1387. https://doi.org/10.1139/e94-121
- Lin, S. 1995. Structural evolution and tectonic significance of the Eastern Highlands shear zone in Cape Breton Island, the Canadian Appalachians: Canadian Journal of Earth Sciences, 32, pp. 545–554. https://doi.org/10.1139/e95-046
- Lin, S., Davis, D.W., Barr, S.M., van Staal, C.R., Chen, Y., and Constantin, M. 2007. U–Pb geochronological constraints on the evolution of the Aspy terrane, Cape Breton Island: Implications for relationships between Aspy and Bras d’Or terranes and Ganderia in the Canadian Appalachians. American Journal of Science, 307, pp. 371–398. https://doi.org/10.2475/02.2007.03
- Ludwig, K.R. 2012. User's Manual for Isoplot 3.75. A Geological Toolkit for Microsoft Excel. Berkeley Geochronology Center Special Publication, 5, 75 p.
- Magyarosi, Z. 2020. Rare-element-enriched pegmatites in central Newfoundland. In Current Research (2020). Newfoundland and Labrador Department of Natural Resources. Geological Survey. Report 20-1, pp. 121–143.
- Maniar, P.D. and Piccolo, P.M. 1989. Tectonic discriminations of granitoids. Geological Society of America Bulletin, 101, pp. 635–643. https://doi.org/10.1130/0016-7606(1989)101<0635:TDOG>2.3.CO;2
- McCarron, T. 2020. Petrology and Geochronology of an inverted metamorphic sequence in the western Cape Breton Highlands, Nova Scotia. Unpublished PhD thesis, University of New Brunswick, Fredericton, New Brunswick, 192 p.
- McFarlane, C.R.M. and Luo, Y. 2012. Modern analytical facilities: U–Pb geochronology using 193nm Excimer LA-ICP-MS optimized for in situ accessory mineral dating in thin sections. Geoscience Canada, 39, pp. 158–172.
- Miller, B.V., Dunning, G.R., Barr, S.M., Raeside, R.P., Jamieson, R.A., and Reynolds, P.H. 1996. Magmatism and metamorphism in a Grenvillian fragment: U–Pb and 40Ar/39Ar ages from the Blair River Complex, northern Cape Breton Island, Nova Scotia, Canada. Geological Society of America Bulletin, 108, pp. 127–140. https://doi.org/10.1130/0016-7606(1996)108<0127:MAMIAG>2.3.CO;2
- Paton, C., Hellstrom, J.C., Paul, B., Woodhead, J.D., and Hergt, J.M. 2011. Iolite: Freeware for the visualisation and processing of mass spectrometric data. Journal of Analytical Atomic Spectrometry, 26, pp. 2508–2518. https://doi.org/10.1039/c1ja10172b
- Pearce, J.A. 1996. Sources and settings of granitic rocks. Episodes, 19, pp. 120–125. https://doi.org/10.18814/epiiugs/1996/v19i4/005
- Pearce, J.A., Harris, N. W. B., and Tindle, A.G. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25, pp. 956–983. https://doi.org/10.1093/petrology/25.4.956
- Peccerillo, A. and Taylor, S.R. 1976. Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area, Northern Turkey. Contributions to Mineralogy and Petrology, 58, pp. 63–81. https://doi.org/10.1007/BF00384745
- Petrus, J.A. and Kamber, B.S. 2012. VizualAge: a novel approach to laser ablation ICP-MS U–Pb geochronology data reduction. Geostandards and Geoanalytical Research, 36, pp. 247–270. https://doi.org/10.1111/j.1751-908X.2012.00158.x
- Piette-Lauzière, N. 2022. Late Devonian shear zone reactivation in the Canadian Appalachian orogen. Unpublished PhD thesis, University of British Columbia (Okanagan), British Columbia, 621 p.
- Piette-Lauzière, N., Larson, K.P., and Kellett, D.A. 2018. Field mapping of the Eastern Highlands shear zone, Cape Breton Island, Nova Scotia. In Targeted Geoscience Initiative, 2017 Report of Activities, Volume 1. Edited by N. Rogers. Geological Survey of Canada, Open File 8358, pp. 23–29. https://doi.org/10.4095/306400
- Piette-Lauzière, N., Graziani, R., Larson, K.P., and Kellett, D.A. 2019. Reactivation of the Eastern Highlands Shear Zone, Cape Breton Island, Appalachian Orogen. In Targeted Geoscience Initiative, 2018 report of activities. Edited by N. Rogers; Geological Survey of Canada, Open File 8549, pp. 295–305. https://doi.org/10.4095/313663
- Piette-Lauzière, N., Larson, K.P., Kellett, D.A., Rogers, N. and Powell, J. in press. Late Devonian shear zone reactivation in the Canadian Appalachian orogen. Geological Society, London, Special Publications. https://doi.org/10.1144/SP542-2022-350
- Price, J., Barr, S.M., Raeside, R.P., and Reynolds, P. 1999. Petrology, tectonic setting, and 40Ar/39Ar (hornblende) dating of the Late Ordovician–Early Silurian Belle Cote Road orthogneiss, western Cape Breton Highlands, Nova Scotia. Atlantic Geology, 35, pp. 1–17. https://doi.org/10.4138/2021
- Raeside, R. P. and Barr, S. M. 1992. Geology of the northern and eastern Cape Breton Highlands, Nova Scotia. Geological Survey of Canada. Paper 89–14, 39p. https://doi.org/10.4095/134060
- Smith, A.M. 2022. Petrology, tectonic setting, and critical element potential of the Park Spur pluton, Aspy terrane, Cape Breton Highlands, Nova Scotia. Unpublished BSc thesis, Acadia University, Wolfville, Nova Scotia, 113p.
- Sombini dos Santos, G., Barr, S.M., White, C.E., and van Rooyen, D. 2020. The rapakivi-bearing Margaree pluton, Cape Breton Island, Canada: Evidence for a Late Devonian post-tectonic cryptic silicic-mafic magma chamber. Canadian Journal of Earth Sciences, 57, pp. 1011–1029. https://doi.org/10.1139/cjes-2019-0220
- Streckeisen, A. 1976. To each plutonic rock its proper name. Earth Sciences Reviews, 12, pp. 1–33. https://doi.org/10.1016/0012-8252(76)90052-0
- Sun, S. and McDonough, W.F. 1989. Chemical and isotopic systematic of oceanic basalts: implications for mantle composition and processes. In Geological Society of London, Special Publications 42, pp. 313–345. https://doi.org/10.1144/GSL.SP.1989.042.01.19
- Sunatori, E. 2022. Extent and timing of deformation and metamorphism associated with the Eastern Highlands Shear Zone, central Cape Breton Highlands, Nova Scotia. Unpublished MSc thesis, Acadia University, Wolfville, Nova Scotia, 358 p.
- Van Rooyen, D. and Barr, S.M. 2020. Ages of plutons associated with economic mineralization in Cape Breton Island, Nova Scotia. In Geoscience and Mines Branch, Report of Activities 2019–2020. Edited by E.W. MacDonald and D.R. MacDonald. Nova Scotia Department of Energy and Mines, Report ME 2020-002, pp. 123–129.
- Van Rooyen, D. and Barr, S.M. 2022. Ages of plutons associated with economic mineralization in Cape Breton Island, Nova Scotia. Nova Scotia Mineral Resources Development Fund Research Grant 2019-030; Open File Report ME 2022-34, 3 p.
- Van Staal, C.R. and Barr, S.M. 2012. Lithospheric architecture and tectonic evolution of the Canadian Appalachians. In Tectonic Styles in Canada Revisited: the LITHOPROBE perspective. Edited by J.A. Percival, F.A. Cook, and R.M. Clowes. Geological Association of Canada, Special Paper 49, pp. 41–95.
- Van Staal, C.R., Whalen, J.B., Valverde-Vaquero, P., Zagorevski, A., and Rogers, N. 2009. Pre- Carboniferous, episodic accretion-related, orogenesis along the Laurentian margin of the northern Appalachians. In Ancient Orogens and Modern Analogues. Edited by J.B. Murphy, J. D. Keppie, and A.J. Hynes. Geological Society, London, Special Publication 327, pp. 271–316. https://doi.org/10.1144/SP327.13
- Van Staal, C.R., Barr, S.M., Waldron, J.W.F., Schofield, D.I., Zagorevski, A., and White, C.E. 2021. Provenance and Paleozoic tectonic evolution of Ganderia and its relationships with Avalonia and Megumia in the Appalachian-Caledonide orogen. Gondwana Research, 98, pp. 212–243. https://doi.org/10.1016/j.gr.2021.05.025
- Waldron, J.W.F., Barr, S.M., Park, A., and White, C.E. 2015. Late Paleozoic strike-slip reconfiguration of the northern Appalachians. Tectonics, 34, 1661–1684. https://doi.org/10.1002/2015TC003882
- Whalen, J. B., Currie, K. L., and Chappell, B. W. 1987. A-type granites: Geochemical characteristics, discrimination and petrogenesis. Contributions to Mineralogy and Petrology, 95, pp. 407–419. https://doi.org/10.1007/BF00402202
- White, C.E., Sombini dos Santos, G., Moning, A.A., Barr, S.M., and van Rooyen, D. 2018. Geological and geochronological studies in the Middle River–Leonard MacLeod Brook area, central Cape Breton Island, Nova Scotia. In Geoscience and Mines Branch, Report of Activities 2016. Edited by E.W. MacDonald and D.R. MacDonald. Nova Scotia Department of Natural Resources, Report ME 2018-001, pp. 89–97.
- White, C.E., Barr, S.M., and Raeside, R.P. 2022. Geological Journey Map of Nova Scotia, Fourth Edition. Atlantic Geoscience Society Special Publication # 64, scale 1:610 000.
- Yaowanoiyothin, W. 1988. Petrology of the Black Brook Granitic Suite and associated gneiss, northeastern Cape Breton Highlands, Nova Scotia. Unpublished MSc thesis, Acadia University, Wolfville, Nova Scotia, 321 p.
- Yaowanoiyothin, W. and Barr, S.M. 1991. Petrology of the Black Brook Granitic Suite, Cape Breton Island, Nova Scotia. Canadian Mineralogist, 29, pp. 499–515.