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Alkaline basaltic volcanism in the Tertiary of central East Greenland—the Trekantnunatakker

Published online by Cambridge University Press:  03 November 2011

P. E. Brown ,
I. B. Evans  and
S. M. Becker
S. M. Becker
Affiliation:
Department of Geology, University of St. Andrews, St Andrews KY16 9ST, U.K. Coach House, Church Lane, Willoughby, LN13 9SU, U.K. Department of Chemistry, University of Dundee, Dundee DD1 4HN, U.K.
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Abstract

The Trekantnunatakker rise from the inland ice NW of the head of Kangerlussuaq fjord on the Blosseville Coast of central East Greenland. In these nunataks the main sequence of Tertiary flood basalts is overlain by picritic and ankaramitic lavas. These mildly alkaline lavas have lower 143Nd/144Nd and higher 87Sr/86Sr than the tholeiitic flood basalts. Their isotopic and incompatible element characteristics are similar to those of moderately enriched ocean island basalts, and comparable to the alkaline lavas of the nearby Prinsen af Wales Bjerge. The Trekantnunatakker lavas were the result of small-volume deep melting and it is concluded that an enriched OIB-type source was present as a component of the East Greenland plume.

Keywords

alkali basaltsankaramitespicritesenriched sourceneodynium and strontium isotopes
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 90 , Issue 2 , 1999 , pp. 165 - 172
Copyright
Copyright © Royal Society of Edinburgh 1999

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References

Anwar, Y. M. 1955. The petrography of the Prinsen af Wales Bjerge lavas. Meddeleser om Gronland 135, 1–31.Google Scholar
Brown, P. E., Evans, I. B. and Becker, S. M. 1996. The Prince of Wales Formation: post-flood basalt alkali volcanism in the Tertiary of East Greenland. Contributions to Mineralogy and Petrology 123, 424–34.CrossRefGoogle Scholar
Chambers, A. D. and Brown, P. E. 1995. The Lilloise intrusion, East Greenland: fractionation of a hydrous alkali picrite magma. Journal of Petrology 36, 933–63.CrossRefGoogle Scholar
Evans, I. B. 1983. Geochemical and isotopic studies of the Tertiary volcanic rocks from the Blosseville Coast region, East Greenland. Unpublished Ph.D. Thesis, University of Aberdeen, U.K.Google Scholar
Fitton, J. G., Saunders, A. D., Larsen, L. M., Fram, M. S., Demant, A. and Sinton, C. 1995. Magma sources and plumbing systems during break up of SE Greenland margin: preliminary results from ODP Leg 152. Journal of the Geological Society of London 152, 985–90.CrossRefGoogle Scholar
Fitton, J. G., Saunders, A. D., Norry, M. J., Hardarson, B. S. and Taylor, R. N. 1997. Thermal and chemical structure of the Iceland plume. Earth and Planetary Science Letters 153, 197–208.CrossRefGoogle Scholar
Hardarson, B. S., Fitton, J. G., Ellam, R. M. and Pringle, M. S. 1997. Rift relocation—a geochemical and geochronological investigation of a palaeo-rift in northwest Iceland. Earth and Planetary Science Letters 153, 181–96.CrossRefGoogle Scholar
Hémond, C., Arndt, N. T., Lichtenstein, U. and Hofmann, A. W. 1993. The heterogeneous Iceland Plume: Nd-Sr-O isotopes and trace element constraints. Journal of Geophysical Research 98B9, 15,833–50.CrossRefGoogle Scholar
Hirose, K. and Kushiro, I. 1993. Partial melting of peridotites at high pressures: determination of compositions of melts segregated from peridotite using aggregates of diamond. Earth and Planetary Science Letters 114, 477–89.CrossRefGoogle Scholar
Hirschmann, M. M., Renne, P. R. and McBirney, A. R. 1997. 40Ar/39Ar dating of the Skaergaard intrusion. Earth and Planetary Science Letters 146, 645–58.CrossRefGoogle Scholar
Hofmann, A. W. 1997. Mantle geochemistry: the message from oceanic volcanism. Nature 385, 219–29.CrossRefGoogle Scholar
Hogg, A. J., Fawcett, J. J., Gittins, J. and Gorton, M. P. 1989. Cyclical variation in composition in continental tholeiites of East Greenland. Canadian Journal of Earth Sciences 26, 534–43.CrossRefGoogle Scholar
Holm, P. M. 1988. Nd, Sr and Pb isotope geochemistry of the Lower Lavas, East Greenland Tertiary igneous province. In Morton, A. C. and Parson, L. M. (eds) Early Tertiary volcanism and the opening of the North Atlantic, Geological Society Special Publication 39, 181–95. London: Geological Society of London.Google Scholar
Larsen, L. M., Watt, W. S. and Watt, M. 1989. Geology and petrology of the Lower Tertiary plateau basalts of the Scoresby Sund region, East Greenland. Bulletin Grønlands Geologiske Undersogelse 157, 1–164.CrossRefGoogle Scholar
Lawver, A. L. and Müller, R. D. 1994. Iceland hot spot track. Geology 22, 311–14.2.3.CO;2>CrossRefGoogle Scholar
Le Maitre, R. W., Bateman, P., Dudek, A., Le Bas, M. J., Sabine, P. A., Schmid, R., Sørensen, H., Streckeisen, A., Wooley, A. R. and Zanetin, B. 1989. A classification of igneous rocks and a glossary of terms. Oxford: Blackwell.Google Scholar
McKenzie, D. and Bickle, M. J. 1988. The volume and composition of melt formed by extension of the lithosphere. Journal of Petrology 29, 625–80.CrossRefGoogle Scholar
Mertz, D. F. and Haase, K. M. 1997. The radiogenic isotope composition of the high-latitude North Atlantic plume. Geology 25, 411–14.2.3.CO;2>CrossRefGoogle Scholar
Middlemost, E. A. K. 1989. Iron oxidation ratios, norms and the classification of volcanic rocks. Chemical Geology 77, 19–26.CrossRefGoogle Scholar
Nakamura, N. 1974. Determination of REE, Ba, Fe, Mg, Na and K in carbonaceous and ordinary chondrites. Geochimica Cosmochimica Acta 38, 757–75.CrossRefGoogle Scholar
Noble, R. H., Macintyre, R. M. and Brown, P. E. 1988. Age constraints on Atlantic evolution: timing of magmatic activity on the E Greenland continental margin. In Morton, A. C. and Parson, L. M. (eds) Early Tertiary volcanism and the opening of the North Atlantic, Geological Society Special Publication 39, 201–14. London: Geological Society.Google Scholar
Pedersen, A. K., Watt, M., Watt, W. S. and Larsen, L. M. 1997. Structure and stratigraphy of the Early Tertiary basalts of the Blosseville Kyst, East Greenland. Journal of the Geological Society of London 154, 565–70.CrossRefGoogle Scholar
Saunders, A. D., Storey, M., Kent, R. W. and Norry, M. J. 1992. Consequences of plume-lithosphere interactions. In Storey, B. C., Alabaster, C. and Pankhurst, R. J. (eds) Magmatism and the causes of continental break-up, Geological Society Special Publication 68, 41–60. London: Geological Society.Google Scholar
Sinton, C. W. and Duncan, R. A. 1998. 40Ar/39Ar ages of lavas from the SE Greenland margin, ODP Leg 152, and the Rockall Plateau, DSDP Leg 81. In Saunders, A. D., Larsen, H. C. and Wise, S. W. Jr. (eds) Proceedings of the Ocean Drilling Program, Scientific Results 152, 387–402.Google Scholar
Soper, N. J., Downie, C., Higgins, A. C. and Costa, L. 1976. Biostratigraphic ages of the Tertiary basalts on the East Greenland continental margin and their relationship to plate separation in the NE Atlantic. Earth and Planetary Science Letters 32, 149–57.CrossRefGoogle Scholar
Sun, S.-s. and McDonough, W. F. 1989. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In Saunders, A. D. and Norry, M. J. (eds) Magmatism in the ocean basins, Geological Society Special Publication 42, 313–45. London: Geological Society.Google Scholar
Tegner, C., Duncan, R. A., Bernstein, S., Brooks, C. K., Bird, D. K. and 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.CrossRefGoogle Scholar
Thirlwall, M. F., Upton, B. J. and Jenkins, C. 1994. Interaction between continental lithosphere and the Iceland plume: Sr-Nd-Pb isotope geochemistry of Tertiary basalts, NE Greenland. Journal of Petrology 35, 839-79.CrossRefGoogle Scholar
Thompson, R. N. 1982. British Tertiary volcanic province. Scottish Journal of Geology 18, 49–107.CrossRefGoogle Scholar
Wager, L. R. 1937. The Kangerdlugssuaq region of East Greenland. Geographical Journal 40, 393–425.CrossRefGoogle Scholar
Wager, L. R. 1947. The stratigraphy and tectonics of Knud Rasmussen Land and the Kangerdlugssuaq region. Meddelelser om Grønland 134, 1–64.Google Scholar
White, R. S. and McKenzie, D. P. 1989. Magmatism at rift zones: the generation of volcanic continental margins and flood basalts. Journal of Geophysical Research 94, 7685–729.CrossRefGoogle Scholar
Zindler, A. and Hart, S. R. 1986. Geochemical dynamics. Annual Review of Earth and Planetary Science 4, 493–571.CrossRefGoogle Scholar