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U–Pb geochronology of the Eocene Kærven intrusive complex, East Greenland: constraints on the Iceland hotspot track during the rift-to-drift transition

Published online by Cambridge University Press:  03 July 2015

SIGURJÓN B. THÓRARINSSON ,
PAUL M. HOLM ,
SEBASTIAN TAPPE ,
LARRY M. HEAMAN  and
NIELS-OLE PRÆGEL
SIGURJÓN B. THÓRARINSSON*
Affiliation:
Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Askja, Sturlugata 7, IS-101 Reykjavik, Iceland Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 København K, Denmark
PAUL M. HOLM
Affiliation:
Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, DK-1350 København K, Denmark
SEBASTIAN TAPPE
Affiliation:
Department of Geology, University of Johannesburg, PO Box 524, Auckland Park 2006, Johannesburg, South Africa Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada
LARRY M. HEAMAN
Affiliation:
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada
NIELS-OLE PRÆGEL
Affiliation:
Copenhagen University Library, Nørre Allé 49, DK-2200 København K, Denmark
*
‡Author for correspondence: [email protected]
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Abstract

Several major tholeiitic (e.g. the Skaergaard intrusion) and alkaline (e.g. the Kangerlussuaq Syenite) intrusive complexes of the North Atlantic Large Igneous Province are exposed along the Kangerlussuaq Fjord in East Greenland. The Kærven Complex forms a satellite intrusion to the Kangerlussuaq Syenite and includes early tholeiitic gabbros and a series of cross-cutting alkaline intrusions ranging from monzonite to alkali granite. The alkaline intrusions cut the gabbros, and are cut by the outer nordmarkite zone of the Kangerlussuaq Syenite. This study presents the first U–Pb zircon ages from the alkaline units of the Kærven Complex. Fourteen multi-grain zircon fractions have been analysed by thermal ionization mass spectrometry (TIMS). Absolute age differences could not be resolved between the different units, suggesting a relatively rapid succession of intrusions between c. 53.5 and 53.3 Ma. Our compilation of precise radiometric age data shows that most of the alkaline magmatism in the Kangerlussuaq Fjord occurred prior to 50 Ma. Moreover, pre-50 Ma alkaline intrusions and lavas show a SSE-younging trend, which is interpreted as the track of the Iceland hotspot during the rift-to-drift transition of the North Atlantic.

Keywords

Kangerlussuaqzirconsyenitepost-break-upNorth Atlantic Igneous Province
Type
Original Articles
Information
Geological Magazine , Volume 153 , Issue 1 , January 2016 , pp. 128 - 142
Copyright
Copyright © Cambridge University Press 2015 

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References

Andreasen, R., Peate, D.W. & Brooks, C.K. 2004. Magma plumbing systems in large igneous provinces: inferences from cyclical variations in Palaeogene East Greenland basalts. Contributions to Mineralogy and Petrology 147, 438–52.Google Scholar
Beckinsale, R.B., Brooks, C.K. & Rex, D.C. 1970. K–Ar ages for the Tertiary of East Greenland. Bulletin of the Geological Society of Denmark 20, 27–37.Google Scholar
Bernstein, S., Kelemen, P.B., Tegner, C., Kurz, M.D., Blusztajn, J. & Brooks, C.K. 1998. Post-breakup basaltic magmatism along the East Greenland Tertiary rifted margin. Earth and Planetary Science Letters 160, 845–62.Google Scholar
Braun, A., Kim, H.R., Csatho, B. & von Frese, R.R.B. 2007. Gravity-inferred crustal thickness of Greenland. Earth and Planetary Science Letters 262, 138–58.CrossRefGoogle Scholar
Brooks, C.K. 1973. Rifting and doming in southern East Greenland. Nature 244, 23–5.Google Scholar
Brooks, C.K. 2011. The East Greenland rifted volcanic margin. Geological Survey of Denmark and Greenland Bulletin 24, 1–96.Google Scholar
Brooks, C.K. & Gill, R.C.O. 1982. Compositional variation in the pyroxenes and amphiboles of the Kangerdlugssuaq intrusion, East Greenland: further evidence for the crustal contamination of syenite magma. Mineralogical Magazine 45, 1–9.Google Scholar
Brooks, C.K. & Platt, R.G. 1975. Kaersutite-bearing gabbroic inclusions and the late dike swarm of Kangerdlugssuaq, East Greenland. Mineralogical Magazine 40, 259–83.Google Scholar
Brooks, C.K., Tegner, C., Stein, H. & Thomassen, B. 2004. Re–Os and 40Ar–39Ar ages of porphyry molybdenum deposits in the East Greenland volcanic rifted margin. Economic Geology 99, 1215–22.Google Scholar
Burke, K. & Dewey, J.F. 1973. Plume-generated triple junctions: key indicators in applying plate tectonics to old rocks. Journal of Geology 81, 406–33.Google Scholar
Deer, W.A. & Kempe, D.R.C. 1976. Geological investigations in East Greenland: Part XI. The minor peripheral intrusion, Kangerdlugssuaq, East Greenland. Meddelelser om Grønland 197, 1–25.Google Scholar
Duncan, R.A. & Richards, M.A. 1991. Hotspots, mantle plumes, flood basalts, and true polar wander. Reviews of Geophysics 29, 31–50.CrossRefGoogle Scholar
Frost, B.R. & Frost, C.D. 2008. A geochemical classification for feldspathic igneous rocks. Journal of Petrology 49, 1955–69.Google Scholar
Gaina, C., Gernigon, L. & Ball, P. 2009. Palaeocene–Recent boundaries in the NE Atlantic and the formation of the Jan Mayen microcontinent. Journal of the Geological Society of London 166, 601–16.Google Scholar
Gleadow, A.J.W. & Brooks, C.K. 1979. Fission track dating, thermal histories and tectonics of igneous intrusions in East Greenland. Contributions to Mineralogy and Petrology 71, 45–60.Google Scholar
Hamilton, E.I. 1966. The isotopic composition of lead in igneous rocks. Earth and Planetary Science Letters 1, 30–7.Google Scholar
Hanan, B.B. & Schilling, J.-G. 1997. The dynamic evolution of the Iceland mantle plume: the lead isotope perspective. Earth and Planetary Science Letters 151, 43–60.Google Scholar
Hanghøj, K., Storey, M. & Stecher, O. 2003. An isotope and trace element study of the East Greenland Tertiary dyke swarm: constraints on temporal and spatial evolution during continental rifting. Journal of Petrology 44, 2081–2112.Google Scholar
Hansen, H. & Nielsen, T.F.D. 1999. Crustal contamination in Palaeogene East Greenland flood basalts: plumbing system evolution during continental rifting. Chemical Geology 157, 89–118.Google Scholar
Hansen, H., Pedersen, A.K., Duncan, R.A., Bird, D.K., Brooks, C.K., Fawcett, J.J., Gittins, J., Gorton, M. & O’Day, P. 2002. Volcanic stratigraphy of the southern Prinsen af Wales Bjerge region, East Greenland. In The North Atlantic Igneous Province: Stratigraphy, Tectonic, Volcanic and Magmatic Processes (eds Jolley, D.W. & Bell, B.R.), pp. 183–218. Geological Society of London, Special Publication no. 197.Google Scholar
Heaman, L.M., Böhm, Ch.O., Machado, N., Krogh, T.E., Weber, W. & Corkery, M.T. 2011. The Pikwitonei Granulite Domain, Manitoba: a giant Neoarchean high-grade terrane in the northwest Superior Province. Canadian Journal of Earth Sciences 48, 205–45.Google Scholar
Heaman, L.M., Erdmer, P. & Owen, J.V. 2002. U–Pb geochronologic constraints on the crustal evolution of the Long Range Inlier, Newfoundland. Canadian Journal of Earth Sciences 39, 845–65.Google Scholar
Hirschmann, M.M., Renne, P.R. & McBirney, A.R. 1997. 40Ar/39Ar dating of the Skaergaard intrusion. Earth and Planetary Science Letters 146, 645–58.Google Scholar
Holm, P.M. 1991. Radiometric age determinations in the Kærven area, Kangerdlugssuaq, East Greenland Tertiary igneous Province: 40Ar/39Ar, K/Ar and Rb/Sr isotopic results. Bulletin of the Geological Society of Denmark 38, 183–201.CrossRefGoogle Scholar
Holm, P.M., Heaman, L.M. & Pedersen, L.E. 2006. Baddeleyite and zircon U–Pb ages from the Kærven area, Kangerlussuaq: implications for the timing of Paleogene continental breakup in the North Atlantic. Lithos 92, 238–50.Google Scholar
Holm, P.M. & Prægel, N.-O. 2006. Cumulates from primitive rift-related East Greenland Paleogene magmas: petrological and isotopic evidence from the ultramafic complexes at Kælvegletscher and near Kærven. Lithos 92, 251–75.Google Scholar
Holm, P.M., Prægel, N.-O. & Egeberg, D.G. 1991. Multiple syenite intrusions at Kærven, Kangerdlugssuaq, East Greenland: evidence from the 1986 field work. Bulletin of the Geological Society of Denmark 38, 173–81.Google Scholar
Holwell, D.A., Selby, D., Boyce, A.J., Gilbertson, J.A. & Abraham-James, T. 2012. A Re–Os date for molybdenite-bearing quartz vein mineralization within the Kangerlussuaq Alkaline Complex, East Greenland: implications for the timing of regional metallogenesis. Economic Geology 107, 713–22.Google Scholar
Irvine, T.N. & Baragar, W.R.A. 1971. A guide to the chemical classification of the common volcanic rocks. Canadian Journal of Earth Sciences 8, 523–48.Google Scholar
Karson, J.A. & Brooks, C.K. 1999. Structural and magmatic segmentation of the Tertiary East Greenland volcanic rifted margin. In Continental Tectonics (eds MacNiocaill, C. & Ryan, P.D.), pp. 313–38. Geological Society of London, Special Publication no. 164.Google Scholar
Kempe, D.R.C., Deer, W.A. & Wager, L.R. 1970. Geological investigations in East Greenland. Part VIII. The petrology of the Kangerlussuaq alkaline intrusion. East Greenland. Meddelelser om Grønland 190, 1–49.Google Scholar
Klausen, M.B. & Larsen, H.C. 2002. East Greenland coast-parallel dike swarm and its role in continental breakup. In Volcanic Rifted Margins (eds Menzies, M.A., Klemperer, S.L., Ebinger, C.J. & Baker, J.) pp. 133–58. Geological Society of America, Boulder, Colorado, Special Paper 362.Google Scholar
Kuiper, K.F., Deino, A., Hilgen, F.J., Krijgsman, W., Renne, P.R. & Wijbrans, J.R. 2008. Synchronizing rock clocks of Earth history. Science 320, 500–4.Google Scholar
Larsen, H.C. 1990. The East Greenland shelf. In The Arctic Ocean Region (ed Sweeney, J.F.), pp. 185–210. Geological Society of America, Boulder, Colorado, The Geology of North America volume L.Google Scholar
Larsen, H.C. & Saunders, A.D. 1998. Tectonism and volcanism at the southeast Greenland rifted margin: a record of plume impact and later continental rupture. In Proceedings of the Ocean Drilling Program, Scientific Results (eds Saunders, A.D., Larsen, H.C. & Wise, S.W. Jr), vol. 152, pp. 503–33. College Station, Texas (Ocean Drilling Program).Google Scholar
Larsen, L.M., Pedersen, A.K., Sørensen, E.V., Watt, W.S. & Duncan, R.A. 2013. Stratigraphy and age of the Eocene Igtertivâ Formation basalts, alkaline pebbles and sediments of the Kap Dalton Group in the graben at Kap Dalton, East Greenland. Bulletin of the Geological Society of Denmark 61, 1–18.Google Scholar
Larsen, R.B. & Brooks, C.K. 1994. Origin and evolution of gabbroic pegmatites in the Skaergaard Intrusion, East Greenland. Journal of Petrology 35, 1651–79.Google Scholar
Lawver, L.A. & Müller, R.D. 1994. Iceland hotspot track. Geology 22, 311–4.Google Scholar
Le Maitre, R.W., Streickeisen, A., Zanettin, B., Le Bas, M.J., Bonin, B., Bateman, P., Bellieni, G., Dudek, A., Efremova, S., Keller, J., Lameyre, J., Sabine, P.A., Schmid, R., Sørensen, H. & Woolley, A.R. (eds) 2002. Igneous Rocks: A Classification and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks. Cambridge: Cambridge University Press, 236 pp.Google Scholar
Lenoir, X., Féraud, G. & Geoffrey, L. 2003. High-rate flexure of the East Greenland volcanic margin: constraints from 40Ar/39Ar dating of basaltic dykes. Earth and Planetary Science Letters 213, 515–28.Google Scholar
Ludwig, K.R. 2003. Isoplot/Ex 3.00. A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication no. 4, 75 pp.Google Scholar
McBirney, A.R. 1989. The Skaergaard Layered Series: I. Structure and average compositions. Journal of Petrology 30, 363–99.Google Scholar
McDougall, I. & Harrison, T.M. 1988. Geochronology and thermochronology of the 40Ar/39Ar method. Oxford: Oxford University Press, Oxford Monographs on Geology and Geophysics, 212 pp.Google Scholar
Miller, J.S., Matzel, J.E.P., Miller, C.F., Burgess, S.D. & Miller, R.B. 2007. Zircon growth and recycling during the assembly of large composite arc plutons. Journal of Volcanology and Geothermal Research 167, 282–99.Google Scholar
Miller, J.S. & Wooden, J.L. 2004. Residence, resorption and recycling of zircons in Devils Kitchen rhyolite, Coso Volcanic Field, California. Journal of Petrology 45, 2155–70.CrossRefGoogle Scholar
Min, K., Mundil, R., Renne, P.R. & Ludwig, K.R. 2000. A test for systematic errors in 40Ar/39Ar geochronology through comparison with U/Pb analysis of a 1.1 Ga rhyolite. Geochimica et Cosmochimica Acta 64, 73–98.Google Scholar
Myers, J.S. 1980. Structure of the coastal dyke swarm and associated plutonic intrusions of East Greenland. Earth and Planetary Science Letters 46, 407–18.Google Scholar
Myers, J.S., Dawes, P.R. & Nielsen, T.F.D. 1988. Geological map of Greenland 1:500 000, Kangerdlugssuaq, Sheet 13. Geological Survey of Greenland and Denmark, Copenhagen.Google Scholar
Nevle, R.J., Brandriss, M.E., Bird, D.K., McWiliams, M.I. & O’Neill, J.R. 1994. Tertiary plutons monitor climate change in East Greenland. Geology 22, 775–8.2.3.CO;2>CrossRefGoogle Scholar
Nielsen, T.F.D. 1978. Tertiary dike swarms of the Kangerdlugssuaq area, East Greenland. An example of magmatic development during continental break-up. Contributions to Mineralogy and Petrology 69, 235–44.Google Scholar
Nielsen, T.F.D. 1987. Tertiary alkaline magmatism in East Greenland: a review. In Alkaline Igneous Rocks (eds. Fitton, J.G. & Upton, B.G.J.), pp. 489–515. Geological Society of London, Special Publication no. 30.Google Scholar
Pankhurst, R.J., Beckinsale, R.D. & Brooks, C.K. 1976. Strontium and oxygen isotope evidence relating to the petrogenesis of the Kangerdlugssuaq alkaline intrusion, East Greenland. Contributions to Mineralogy and Petrology 54, 17–42.CrossRefGoogle Scholar
Peate, D.W. & Stecher, O. 2003. Pb isotope evidence for contributions from different Iceland mantle components to Palaeogene East Greenland flood basalts. Lithos 67, 39–52.Google Scholar
Peate, D.W., Baker, J.A., Blichert-Toft, J., Hilton, D.R., Storey, M., Kent, A.J.R., Brooks, C.K., Hansen, H., Pedersen, A.K. & Duncan, R.A. 2003. The Prinsen af Wales Bjerge Formation lavas, East Greenland: the transition from tholeiitic to alkalic magmatism during Palaeogene continental break-up. Journal of Petrology 44, 279–304.Google Scholar
Peate, D.W., Barker, A.K., Riishuus, M.S. & Andreasen, R. 2008. Temporal variations in crustal assimilation of magma suites in the East Greenland flood basalt province: Tracking the evolution of magmatic plumbing systems. Lithos 102, 179–97.Google Scholar
Riishuus, M.S., Peate, D.W., Tegner, C., Wilson, J.R. & Brooks, C.K. 2008. Petrogenesis of cogenetic silica-oversaturated and -undersaturated syenites by periodic recharge in a crustally contaminated magma chamber: the Kangerlussuaq intrusion, East Greenland. Journal of Petrology 49, 493–522.Google Scholar
Riishuus, M.S., Peate, D.W., Tegner, C., Wilson, J.R., Brooks, C.K. & Harris, C. 2006. Temporal evolution of a long-lived syenitic centre: the Kangerlussuaq Alkaline Complex, East Greenland. Lithos 92, 276–99.Google Scholar
Riishuus, M.S., Peate, D.W., Tegner, C., Wilson, J.R., Brooks, C.K. & Waight, T.E. 2005. Petrogenesis of syenites at a rifted continental margin: origin, contamination and interaction of alkaline mafic and felsic magmas in the Astrophyllite Bay Complex, East Greenland. Contributions to Mineralogy and Petrology 149, 350–71.Google Scholar
Saunders, A.D., Fitton, J.G., Kerr, A.C., Norry, M.J. & Kent, R.W. 1997. The North Atlantic igneous province. In Large Igneous Provinces: Continental, Oceanic, and Planetary Flood Volcanism (eds Coffin, M.F. & Mahoney, J.J.), pp. 45–93. American Geophysical Union, Geophysical Monograph no. 100.Google Scholar
Schärer, U. 1984. The effect of initial 230Th disequilibrium on young U–Pb ages: the Makalu case, Himalaya. Earth and Planetary Science Letters 67, 191–204.Google Scholar
Smallwood, J.R. & White, R.S. 2002. Ridge–plume interaction in the North Atlantic and its influence on continental breakup and seafloor spreading. In The North Atlantic Igneous Province: Stratigraphy, Tectonic, Volcanic and Magmatic Processes (eds Jolley, D.W. & Bell, B.R.), pp. 15–37. Geological Society of London, Special Publication no. 197.Google Scholar
Steiger, R.H. & Jäger, E. 1977. Subcomission on geochronology: convention on the use of decay constants in geo- and cosmochronology. Earth and Planetary Science Letters 36, 359–62.Google Scholar
Stein, H.J., Markey, R.J., Morgan, J.W., Hannah, J.L. & Scherstén, A. 2001. The remarkable Re–Os chronometer in molybdenite: how and why it works. Terra Nova 13, 479–86.Google Scholar
Storey, M., Duncan, R.A. & Swisher III, C.C. 2007. Paleocene-Eocene thermal maximum and the opening of the northeast Atlantic. Science 316, 587–9.Google Scholar
Storey, M., Duncan, R.A. & Tegner, C. 2007. Timing and duration of volcanism in the North Atlantic Igneous Province: implications for geodynamics and links to the Iceland hotspot. Chemical Geology 241, 264–81.Google Scholar
Stracke, A., Zindler, A., Salters, V.J.M., McKenzie, D., Blichert-Toft, J., Albarède, F. & Grönvold, K. 2003. Theistareykir revisted. Geochemistry, Geophysics, Geosystems 4, doi: 10.1029/2001GC000201.Google Scholar
Tappe, S., Foley, S.F., Stracke, A., Romer, R.L., Kjarsgaard, B.A., Heaman, L.M. & Joyce, N. 2007. Craton reactivation on the Labrador Sea margins: 40Ar/39Ar age and Sr–Nd–Hf–Pb isotope constraints from alkaline and carbonatite intrusives. Earth and Planetary Science Letters 256, 433–54.Google Scholar
Tegner, C., Brooks, C.K., Duncan, R.A., Heister, L.E. & Bernstein, S. 2008. 40Ar–39Ar ages of intrusions in East Greenland: rift-to-drift transition over the Iceland hotspot. Lithos 101, 480–500.CrossRefGoogle Scholar
Tegner, C., Duncan, R.A., Bernstein, S., Brooks, C.K., Bird, D.K. & Storey, M. 1998. 40Ar–39Ar geochronology of Tertiary mafic intrusions along the East Greenland rifted margin: relation to flood basalts and the Iceland hotspot track. Earth and Planetary Science Letters 156, 75–88.Google Scholar
Todt, M.W., Cliff, R.A., Hanser, A. & Hofmann, A.W. 1996. Evaluation of a 202Pb–205Pb double spike for high-precision lead isotope analysis. Geophysical Monograph 95, 429–37.Google Scholar
Torsvik, T.H., Mosar, J. & Eide, E.A. 2001. Cretaceous–Tertiary geodynamics: a North Atlantic exercise. Geophysical Journal International 146, 850–66.Google Scholar
Wager, L.R. 1965. The form and internal structure of the alkaline Kangerdlugssuaq intrusion, East Greenland. Mineralogical Magazine 34, 487–97.Google Scholar
Waight, T., Baker, J. & Willigers, B. 2002. Rb isotope dilution analyses by MC-ICPMS using Zr to correct for mass fractionation: towards improved Rb–Sr geochronology? Chemical Geology 186, 99–116.Google Scholar
White, R. & McKenzie, D. 1989. Magmatism at rift zones. The generation of volcanic continental margins and flood basalts. Journal of Geophysical Research 94, 7685–729.Google Scholar
Wotzlaw, J.-F., Bindeman, I.N., Schaltegger, U., Brooks, C.K. & Naslund, H.R. 2012. High-resolution insights into episodes of crystallization, hydrothermal alteration and remelting in the Skaergaard intrusive complex. Earth and Planetary Science Letters 355–356, 199–212.Google Scholar
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