Hostname: page-component-848d4c4894-wg55d Total loading time: 0 Render date: 2024-06-03T14:28:07.577Z Has data issue: false hasContentIssue false
  • English
  • Français

Nd and Pb isotope mapping of crustal domains within the Makkovik Province, Labrador

Published online by Cambridge University Press:  03 April 2018

R. M. MOUMBLOW ,
G. A. ARCURI ,
A. P. DICKIN  and
C. F. GOWER
R. M. MOUMBLOW
Affiliation:
School of Geography and Earth Sciences, McMaster University, Hamilton, Ontario, Canada
G. A. ARCURI
Affiliation:
School of Geography and Earth Sciences, McMaster University, Hamilton, Ontario, Canada Present address: Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada
A. P. DICKIN*
Affiliation:
School of Geography and Earth Sciences, McMaster University, Hamilton, Ontario, Canada
C. F. GOWER
Affiliation:
Department of Natural Resources, Government of Newfoundland and Labrador, St John's, Newfoundland, Canada
*
‡Author for correspondence: dickin@mcmaster.ca
Get access Rights & Permissions [Opens in a new window]

Abstract

The Makkovik Province of eastern Labrador represents part of an accretionary orogen active during an early stage in the development of the Palaeoproterozoic southern Laurentian continental margin. New Nd isotope data for the eastern Makkovik Province suggest that accreted juvenile Makkovik crust was generated in the Cape Harrison domain during a single crust-forming event at c. 2.0 Ga. Pb isotope data support this model, and show a strong similarity to radiogenic crustal signatures in the juvenile Palaeoproterozoic crust of the Ketilidian mobile belt of southern Greenland. As previously proposed, an arc accretion event at c. 1.9 Ga triggered subduction-zone reversal and the development of an ensialic arc on the composite margin. After the subduction flip, a temporary release of compressive stress at c. 1.87 Ga led to the development of a retro-arc foreland basin on the downloaded Archean continental edge, forming the Aillik Group. Unlike previous models, a second arc is not envisaged. Instead, a compressive regime at c. 1.82 Ga is attributed to continued ensialic arc plutonism on the existing margin. The tectonic model for the Makkovikian orogeny proposed here is similar to that for the Ketilidian orogeny. Major- and trace-element analyses suggest that much of the magmatism in the Makkovik orogen results from post-accretionary ensialic arc activity, and that few vestiges remain of the original accreted volcanic arc. This pattern of arc accretion and intense post-accretion reworking is common to many accretionary orogens, such as the South American Andes and North American Cordillera.

Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 5 , May 2019 , pp. 833 - 848
Copyright
Copyright © Cambridge University Press 2018 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Alvarado, A., Audin, L., Nocquet, J. M., Jaillard, E., Mothes, P., Jarrín, P., Segovia, M., Ralandone, F. & Cisneros, D. 2016. Partitioning of oblique convergence in the Northern Andes subduction zone: Migration history and the present-day boundary of the North Andean Sliver in Ecuador. Tectonics 35, 1048–65.Google Scholar
Barr, S. M., White, C. E., Culshaw, N. G. & Ketchum, J. W. F. 2001. Geology and tectonic setting of Paleoproterozoic granitoid suites in the Island Harbour Bay area, Makkovik Province, Labrador. Canadian Journal of Earth Sciences 38, 441–63.Google Scholar
Beaumont, C., Ellis, S., Hamilton, J. & Fullsack, P. 1996. Mechanical model for subduction-collision tectonics of Alpine-type compressional orogens. Geology 24, 675–8.Google Scholar
Cant, D. J. & Stockmal, G. S. 1989. Alberta foreland basin: relationship between stratigraphy and Cordilleran terrane-accretion events. Canadian Journal of Earth Sciences 26, 1964–75.Google Scholar
Culshaw, N., Ketchum, J. & Barr, S. 2000. Structural evolution of the Makkovik Province, Labrador, Canada: tectonic processes during 200 Myr at a Paleoproterozoic active margin. Tectonics 19, 961–77.Google Scholar
Debon, F. & LeFort, P. 1983. A chemical-mineralogical classification of common plutonic rocks and associations. Transactions of the Royal Society of Edinburgh: Earth Sciences 73, 135–49.Google Scholar
DePaolo, D. J. 1981. Neodymium isotopes in the Colorado Front Range and crust-mantle evolution in the Proterozoic. Nature 291, 193–6.Google Scholar
Dickin, A. P. 1998. Pb isotope mapping of differentially uplifted Archean basement: a case study from the Grenville Province, Ontario. Precambrian Research 91, 445–54.Google Scholar
Dickin, A. P. 2000. Crustal formation in the Grenville Province: Nd-isotope evidence. Canadian Journal of Earth Sciences 37, 165–81.Google Scholar
Dickin, A. P. & McNutt, R. H. 1989. Nd model age mapping of the southeast margin of the Archean foreland in the Grenville Province of Ontario. Geology 17, 299–302.Google Scholar
Garde, A. A., Hamilton, M. A., Chadwick, B., Grocott, J. & McCaffrey, K. J. W. 2002. The Ketilidian orogen of South Greenland: geochronology, tectonics, magmatism, and fore-arc accretion during Paleoproterozoic oblique convergence. Canadian Journal of Earth Sciences 39, 765–93.Google Scholar
Gower, G. F., Kamo, S. L., Kwok, K. & Krogh, T. E. 2008. Proterozoic southward accretion and Grenville orogenesis in the interior Grenville Province in eastern Labrador: Evidence from U-Pb geochronological investigations. Precambrian Research 165, 61–95.Google Scholar
Gower, C. F. & Ryan, B. 1986. Proterozoic evolution of the Grenville Province and adjacent Makkovik Province in east-central Labrador. In The Grenville Province (ed. Moore, J. M.), Pp. 291–96. Geological Association of Canada, Special Paper no. 31.Google Scholar
Hall, J., Louden, K. E., Funck, T. & Deemer, S. 2002. Geophysical characteristics of the continental crust along the Lithoprobe Eastern Canadian Shield Onshore–Offshore Transect (ECSOOT): a review. Canadian Journal of Earth Sciences 39, 569–87.Google Scholar
Hall, J., Wardle, R. J., Gower, C. F., Kerr, A., Coflin, K., Keen, C. E. & Carroll, P. 1995. Proterozoic orogens of the northeastern Canadian Shield: new information from the Lithoprobe ECSOOT crustal reflection seismic survey. Canadian Journal of Earth Sciences 32, 1119–31.Google Scholar
Haschke, M., Siebel, W., Günther, A. & Scheuber, E. 2002. Repeated crustal thickening and recycling during the Andean orogeny in north Chile (21–26 S). Journal of Geophysical Research: Solid Earth, 107 (B1), 49–55.Google Scholar
Hinchey, A. M. & Davis, W. J. 2013. New U-Pb zircon geochronology for the Measles Point granite, Aillik Domain, Makkovik Province, Labrador (NTS map area 13O/03). Current Research (2013) Newfoundland and Labrador Department of Natural Resources Geological Survey, Report 13–1, 223–32.Google Scholar
Kalsbeek, F. & Taylor, P. N. 1985. Isotopic and chemical variation in granites across a Proterozoic continental margin – the Ketilidian mobile belt of South Greenland. Earth and Planetary Science Letters 73, 65–80.Google Scholar
Kerr, A. 1989. Geochemistry of the Trans-Labrador Granitoid Belt, Canada: a quantitative comparative study of a Proterozoic batholith and possible Phanerozoic counterparts. Precambrian Research 45, 1–17.Google Scholar
Kerr, A. 1994. Early Proterozoic magmatic suites of the eastern Central Mineral Belt Makkovik Province, Labrador: Geology, geochemistry and mineral potential. Newfoundland Department of Mines and Energy, Geological Survey, Report 94-3.Google Scholar
Kerr, A. & Fryer, B. J. 1993. Nd isotope evidence for crust-mantle interaction in the genesis of A-type granitoid suites in Labrador, Canada. Chemical Geology 104, 39–60.Google Scholar
Kerr, A. & Fryer, B. J. 1994. The importance of late- and post-orogenic crustal growth in the early Proterozoic: evidence from Sm-Nd isotopic studies of igneous rocks in the Makkovik Province, Canada. Earth and Planetary Science Letters 125, 71–88.Google Scholar
Kerr, A., Hall, J., Wardle, R. J., Gower, C. F. & Ryan, B. 1997. New reflections on the structure and evolution of the Makkovikian-Ketilidian Orogen in Labrador and southern Greenland. Tectonics 16, 942–65.Google Scholar
Kerr, A. & Krogh, T. 1990. The Trans-Labrador belt in the Makkovik Province: new geochronological and isotopic data and their geological implications. Current Research, Newfoundland Department of Mines and Energy, Geological Survey Branch, Report 90–1, 237–249.Google Scholar
Kerr, A., Krogh, T. E., Corfu, F., Schärer, U., Gandhi, S. S. & Kwok, Y. Y. 1992. Episodic Early Proterozoic granitoid plutonism in the Makkovik Province, Labrador: U-Pb geochronological data and geological implications. Canadian Journal of Earth Sciences 29, 1166–79.Google Scholar
Kerr, A., Ryan, B., Gower, C. F., Wardle, R. J. & Hall, J. 1996. The Makkovik Province: extension of the Ketilidian mobile belt in mainland North America. In Precambrian Crustal Evolution in the North Atlantic Region (eds Brewer, T. S. & Aitkin, B. P.), pp. 155–77. Geological Society of London, Special Publication no. 112.Google Scholar
Kerr, A. & Wardle, R. J. 1997. Definition of an Archean-Proterozoic crustal suture by isotopic studies of basement intersections from offshore wells in the southern Labrador Sea. Canadian Journal of Earth Sciences 34, 209–14.Google Scholar
Ketchum, J. W. F., Barr, S. M., Culshaw, N. G. & White, C. E. 2001a. U-Pb ages of granitoid rocks in the northwest Makkovik Province, Labrador: evidence for 175 million years of episodic synorogenic and postorogenic plutonism. Canadian Journal of Earth Sciences 38, 359–72.Google Scholar
Ketchum, J. W. F., Culshaw, N. G. & Barr, S. M. 2002. Anatomy and orogenic history of a Paleoproterozoic accretionary belt: The Makkovik Province, Labrador, Canada. Canadian Journal of Earth Sciences 39, 711–30.Google Scholar
Ketchum, J. W. F., Culshaw, N. G. & Dunning, G. R. 1997. U-Pb geochronologic constraints on Paleoproterozoic orogenesis in northwestern Makkovik Province, Labrador, Canada. Canadian Journal of Earth Sciences 34, 1072–88.Google Scholar
Ketchum, J. W. F., Jackson, S. E., Culshaw, N. E. & Barr, S. E. 2001b. Depositional and tectonic setting of the Paleoproterozoic Lower Aillik Group, Makkovik Province, Canada: evolution of a passive margin-foredeep sequence based on petrochemistry and U-Pb (TIMS and LAM-ICP-MS) geochronology. Precambrian Research 105, 331–56.Google Scholar
LaFlamme, C., Sylvester, P. J., Hinchey, A. M. & Davis, W. J. 2013. U–Pb age and Hf-isotope geochemistry of zircon from felsic volcanic rocks of the Paleoproterozoic Aillik Group, Makkovik Province, Labrador. Precambrian Research 224, 129–42.Google Scholar
Loewy, S. L., Connelly, J. N., Dalziel, I. W. D. & Gower, C. F. 2003. Eastern Laurentia in Rodinia: constraints from whole-rock Pb and U/Pb geochronology. Tectonophysics 375, 169–97.Google Scholar
McNutt, R. H. & Dickin, A. P. 2012. A comparison of Nd model ages and U–Pb zircon ages of Grenville granitoids: constraints on the evolution of the Laurentian margin from 1.5 to 1.0 Ga. Terra Nova 24, 7–15.Google Scholar
Oversby, V. M. 1974. New look at the lead isotope growth curve. Nature 248, 132–3.Google Scholar
Patchett, P. J. & Bridgwater, D. 1984. Origin of continental crust of 1.9-1.7 Ga age by Nd isotopes in the Ketilidian terrain of South Greenland. Contributions to Mineralogy and Petrology 87, 311–8.Google Scholar
Pearce, J. A., Harris, N. B. W. & Tindle, A. G. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology 25, 856–983.Google Scholar
Schärer, U. & Gower, C. F. 1988. Crustal evolution in eastern Labrador; constraints from precise U-Pb age. Precambrian Research 38, 405–21.Google Scholar
Sinclair, G. S., Barr, S. M., Culshaw, N. G. & Ketchum, J. W. F. 2002. Geochemistry and age of the Aillik Group and associated plutonic rocks, Makkovik Bay area, Labrador: implications for tectonic development of the Makkovik Province. Canadian Journal of Earth Sciences 39, 731–48.Google Scholar
Thirlwall, M. F. 1982. Systematic variation in chemistry and Nd-Sr isotopes across a Caledonian calc-alkaline volcanic arc: implications for source materials. Earth and Planetary Science Letters 58 (1), 27–50.Google Scholar
Thirlwall, M. F. 1991. Long-term reproducibility of multicollector Sr and Nd isotope ratio analysis. Chemical Geology 94 (2), 85–104.Google Scholar
Wasteneys, H. A., Wardle, R. J. & Krogh, T. E. 1996. Extrapolation of tectonic boundaries across the Labrador shelf: U-Pb geochronology of well samples. Canadian Journal of Earth Sciences 33 (9), 1308–24.Google Scholar
Wilton, D. H. C. 1991. Metallogenic and tectonic implications of Pb isotope data for galena separates from the Labrador Central Mineral Belt. Economic Geology 86, 1721–36.Google Scholar
Supplementary material: File

Moumblow et al. supplementary material

Moumblow et al. supplementary material 1

Download Moumblow et al. supplementary material(File)
File 47.6 KB
Supplementary material: File

Moumblow et al. supplementary material

Moumblow et al. supplementary material 2

Download Moumblow et al. supplementary material(File)
File 22.5 KB