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Carbonatites and lamprophyres of the Gardar Province – a ‘window’ to the sub-Gardar mantle?

Published online by Cambridge University Press:  05 July 2018

I. M. Coulson ,
K. M. Goodenough ,
N. J. G. Pearce  and
M. J. Leng
I. M. Coulson*
Affiliation:
Solid Earth Studies Laboratory, Department of Geology, The University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
K. M. Goodenough
Affiliation:
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK
N. J. G. Pearce
Affiliation:
Institute of Geography and Earth Sciences, University of Wales, Aberystwyth SY23 3DB, UK
M. J. Leng
Affiliation:
NERC Isotope Geosciences Laboratory, Keyworth, Nottingham NG12 5GG, UK
*
* E-mail: [email protected]
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Abstract

Carbonatite magmas are considered to be ultimately derived from mantle sources, which may include lithospheric and asthenospheric reservoirs. Isotopic studies of carbonatite magmatism around the globe have typically suggested that more than one source needs to be invoked for generation of the parental melts to carbonatites, often involving the interaction of asthenosphere and lithosphere.

In the rift-related, Proterozoic Gardar Igneous Province of SW Greenland, carbonatite occurs as dykes within the Igaliko Nepheline Syenite Complex, as eruptive rocks and diatremes at Qassiarsuk, as a late plug associated with nepheline syenite at Grønnedal-Íka, and as small bodies associated with ultramafic lamprophyre dykes. The well-known cryolite deposit at Ivittuut was also rich in magmatic carbonate. The carbonatites are derived from the mantle with relatively little crustal contamination, and therefore should provide important information about the mantle sources of Gardar magmas. In particular, they are found intruded both into Archaean and Proterozoic crust, and hence provide a test for the involvement of lithospheric mantle.

A synthesis of new and previously published major and trace element, Sr, Nd, C and O isotope data for carbonatites and associated lamprophyres from the Gardar Province is presented. The majority of Gardar carbonatites and lamprophyres have consistent geochemical and isotopic signatures that are similar to those typically found in ocean island basalts. The geochemical characteristics of the two suites of magmas are similar enough to suggest that they were derived from the same mantle source. C and O isotope data are also consistent with a mantle derivation for the carbonatite magmas, and support the theory of a cogenetic origin for the carbonatites and the lamprophyres. The differences between the carbonatites and lamprophyres are considered to represent differing degrees of partial melting of a similar source.We suggest that the ultimate source of these magmas is the asthenospheric mantle, since there is no geochemical or isotopic evidence for their having been derived directly from ancient, enriched sub-continental lithospheric mantle. However, it is likely that the magmas actually formed through a two-stage process, with small-degree volatile-rich partial melts rising from the asthenospheric mantle and being ‘frozen in’ as metasomites, which were then rapidly remobilized during Gardar rifting.

Keywords

carbonatitelamprophyremantlealkalineGardarGreenland
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 5 , October 2003 , pp. 855 - 872
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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References

Andersen, T. (1984) Secondary processes in carbonatites: Petrology of ‘rødberg’ (hematite-calcite-dolomite- carbonatite) in the Fen Central Complexes, Telemark (South Norway). Lithos, 17, 227—245.CrossRefGoogle Scholar
Andersen, T. (1987) Mantle and crustal components in a carbonatite complex, and the evolution of carbonatite magmas. REE and isotopic evidence from the Fen complex, southeast Norway. Chemical Geology, 65, 147—166.Google Scholar
Andersen, T. (1997) Age and petrogenesis of the Qassiarsuk carbonatite-alkaline silicate volcanic complex in the Gardar rift, South Greenland. Mineralogical Magazine, 61, 499—513.CrossRefGoogle Scholar
Bailey, J.C. (1980) Formation of cryolite and other aluminofluorides: a petrologic review. Bulletin of the Geological Society of Denmark, 29, 1—45.Google Scholar
Bedford, C.M. (1989) The mineralogy, geochemistry and petrogenesis of the Grønnedal-I´ka complex, southwest Greenland. PhD thesis, University of Durham, Durham, UK.Google Scholar
Bell, K. (2001) Carbonatites: relationships to mantleplume activity. Pp. 267—290 in: Mantle Plumes: their Identification through Time (Ernst, R.E. and Buchan, K.L., editors). Geological Society of America Special Paper 352, Boulder, Colorado.Google Scholar
Bell, K. and Blenkinsop, J. (1987) Nd and Sr isotopic compositions of East African carbonatites: implications for mantle heterogenei ty. Geology, 15, 99—102.2.0.CO;2>CrossRefGoogle Scholar
Bell, K. and Blenkinsop, J. (1989) Neodymium and strontium isotope geochemistry of carbonatites. Pp. 278—300 in: Carbonatites – Genesis and Evolution (Bell, K., editor). Unwin Hyman, London.Google Scholar
Bell, K. and Tilton, G.R. (2001) Nd, Pb and Sr isotopic compositions of East African carbonatites: evidence for mantle mixing and plume inhomogeneity. Journal of Petrology, 42, 1927—1945.CrossRefGoogle Scholar
Bell, K. and Tilton, G.R. (2002) Probing the mantle: the story from carbonatites. Eos (Transactions of the American Geophysical Union), 83, 273, 276—277.Google Scholar
Berthelsen, A. (1962) On the geology of the country around Ivigtut, SW Greenland. Geologisches Rundschau, 52, 269—280.CrossRefGoogle Scholar
Berthelsen, A. and Henriksen, N. (1975) Geological Map of Greenland. 1:100,000, Ivigtut 61 v. 1 Syd. The orogenic and cratogenic geology of the Precambrian shield area. Descrip t ive text. Geological Survey of Denmark and Greenland, Copenhagen, 169 pp.Google Scholar
Bizzarro, M., Simonetti, A., Stevenson, R.K. and David, J. (2002) Hf isotope evidence for a hidden mantle reservoir. Geology, 30, 771—774.2.0.CO;2>CrossRefGoogle Scholar
Blaxland, A.B.,van Breemen, O., Emeleus, C.H. and Anderson, J.G. (1978) Age and origin of the major syenite centres in the Gardar province of SouthGreenland: Rb-Sr studies. Geological Society of America Bulletin, 89, 231—244.2.0.CO;2>CrossRefGoogle Scholar
Boynton, W.V. (1984) Geochemistry of the rare-earth elements. Meteorite studies. Pp. 63—114 in: Rare Earth Element Geochemistry (Henderson, P., editor). Elsevier, Amsterdam.CrossRefGoogle Scholar
Chadwick, B. and Garde, A.A. (1996) Palaeoproterozoic oblique plate convergence in South Greenland: a reappraisal of the Ketilidian orogen. Pp. 179—196 in: Precambrian Crustal Evolution in the North Atlantic Region (Brewer, T.S., editor). Special Publication, 112. Geological Society, London.Google Scholar
Chambers, A.D. (1976) The petrology and geochemistry of the North Qôroq centre, Igaliko Complex, South Greenland. PhD thesis, University of Durham, UK.Google Scholar
Clarke, L.B., Le Bas, M.J. and Spiro, B. (1993) Rare earth, trace elements and stable isotope fractionation of carbonatites at Kruidfontein, Transvaal, South Africa. Proceedings of the 5th Kimberlite conference: 1. Kimberlite, related rocks and mantle xenoliths . CPRM, Brasilia, Pp. 236—251.Google Scholar
Coulson, I.M. (1996) Rare-earth and high-. eld-strength element mobility in and around the North Qôroq centre, Gardar Province of South Greenland. PhD thesis, University of Birmingham, Edgbaston, Birmingham, UK.Google Scholar
Coulson, I.M. (1997) Post-magmatic alteration in eudialyte from the North Qôroq centre, South Greenland. Mineralogical Magazine, 61, 99—109.CrossRefGoogle Scholar
Coulson, I.M. and Chambers, A.D. (1996) Patterns of zonation in rare-earth-bearing minerals in nepheline syenites of the North Qôroq center, South Greenland. The Canadian Mineralogist, 34, 1163—78.Google Scholar
Coulson, I.M., Leng, M.J., Pearce, N.J.G. and Chambers, A.D. (1998) The origin of carbonatites in the North Qôroq central complex, and possible links with carbonatite/ alkaline magmatism in the Precambrian Gardar rift of Southern Greenland. Volcanic and Magmatic Studies Group annual meeting, Leicester, UK. Program and abstracts, p. 16.Google Scholar
Coulson, I.M., Russell, J.K. and Dipple, G.M. (1999) Origins of the Zippa Mountain pluton: a Late Triassic, arc-derived, ultrapotassic magma from the Canadian Cordillera. Canadian Journal of Earth Sciences, 36, 1415—1434.CrossRefGoogle Scholar
Dalton, J.A. and Presnall, D.C. (1998) The continuum of primary carbonatitic-kimberlitic compositions in equilibrium with lherzolite: data from the system CaO-MgO-Al2O3-SiO2-CO2 at 6 GPa. Journal of Petrology, 39, 1953—1964.Google Scholar
Deines, P. (1989) Stable isotope variations in carbonatites. Pp. 301—359 in: Carbonatites – Genesis and Evolution (Bell, K., editor). Unwin Hyman, London.Google Scholar
Deines, P. and Gold, D.P. (1973) The isotopic composition of carbonatite and kimberlite carbonates and their bearing on the isotopic composition of deep-seated carbon. Geochimica et Cosmochimica Acta, 37, 1709—1733.CrossRefGoogle Scholar
Emeleus, C.H. (1964) The Grønnedal-I´ka alkaline complex, South Greenland. Meddelel ser om Grønland, 172.Google Scholar
Emeleus, C.H. and Harry, W.T. (1970) The Igaliko Nepheline syenite complex: general description. Meddelelser om Grønland, 186.Google Scholar
Finch, A.A., Goodenough, K.M., Salmon, H.M. and Andersen, T. (2001) The petrology and petrogenesis of the North Motzfeldt Centre, Gardar Province, South Greenland. Mineralogical Magazine, 65, 759—74.CrossRefGoogle Scholar
Friedman, G.M. (1959) Identification of carbonate minerals by staining methods. Jour nal of Sedimentary Petrology, 29, 87—97.Google Scholar
Garde, A.A., Hamilton, M.A., Chadwick, B., Grocott, J. and McCaffrey, K.J.W. (2002) The Ketilidian orogen of South Greenland: tectonics, magmatism and forearc accretion during Palaeoproterozoic oblique convergence. Canadian Journal of Earth Sciences, 39, 765—793.CrossRefGoogle Scholar
Gill, R.C.O. (1972) The geochemistry of the Grønnedal- I´ ka alkaline complex, South Greenland. PhD thesis, University of Durham, UK.Google Scholar
Gittins, J. and Harmer, R.E. (1997) What is ferrocarbonatite? A revised classi. cation. African Journal of Earth Science, 25, 159—168.CrossRefGoogle Scholar
Goodenough, K.M. (1997) Geochemistry of Gardar intrusions in the Ivigtut area, South Greenland. PhD thesis, University of Edinburgh, UK.Google Scholar
Goodenough, K.M., Upton, B.G.J. and Ellam, R.M. (2000) Geochemical evolution of the Ivigtut granite, South Greenland. Lithos, 51, 205—221.CrossRefGoogle Scholar
Goodenough, K.M., Upton, B.G.J. and Ellam, R.M. (2002) Long-term memory of subduction processes in lithospheric mantle: evidence from the geochemistry of basic dykes in the Gardar Province of South Greenland. Journal of the Geological Society, 159, 705—714.CrossRefGoogle Scholar
Harmer, R.E. and Gittins, J. (1997) The origin of dolomitic carbonatites: . eld and experimental constraints. Journal of African Earth Sciences, 25, 5—28.CrossRefGoogle Scholar
Harmer, R.E. and Gittins, J. (1998) The case for primary, mantle-derive d carbona tite magma. Journal of Petrology, 39, 1895—903.CrossRefGoogle Scholar
Hayward, C.L. and Jones, A.P. (1991) Cathodoluminescence petrography of Middle Proterozoic extrusiv e carbonat ite from Qasiarsu k, South Greenland. Mineralogical Magazine, 55, 591—603.CrossRefGoogle Scholar
Hoernle, K., Tilton, G., Le Bas, M.J., Duggan, S. and Garbe-Schönberg, D. (2002) Geochemistry of oceanic carbonatites compared with continental carbonatites: mantle recycling of oceanic crustal carbonat e. Contributions to Mineralogy and Petrology, 142, 520—542.CrossRefGoogle Scholar
Keller, J. and Hoefs, J. (1995) Stable isotope characteristics of recent natrocarbonatites from Oldoinyo Lengai. Pp. 113—123 in: Carbonatite Volcanism: Oldoinyo Lengai and the Petrogenesis of Natrocarbonatites (Bell, K. and Keller, J., editors). IAVCEI Proceedings in Volcanology 4. Springer, Berlin.CrossRefGoogle Scholar
Kjarsgaard, B.A. and Hamilton, D.L. (1988) Liquid immiscibility and the origin of alkali-poor carbonatites. Mineralogical Magazine, 52, 43—55.CrossRefGoogle Scholar
Kjarsgaard, B.A. and Hamilton, D.L. (1989) The genesis of carbonatites by immiscibility. Pp. 388—404 in: Carbonatites – Genesis and Evolution (Bell, K., editor). Unwin Hyman, London.Google Scholar
Kwon, S.-T., Tilton, G.R. and Gru¨nenfelder, M.H. (1989) Lead isotope relationships in carbonatites and alkalic complexes: an overview. Pp. 360—387 in: Carbonatites – Genesis and Evolution (Bell, K., editor). Unwin Hyman, London.Google Scholar
Leat, P.T., Riley, T.R., Storey, B.C., Kelley, S.P. and Millar, I.L. (2000) Middle Jurassic ultramaficlamprophyre dyke within the Ferrar magmatic provin ce, Pensacol a Mount ains, Antarctica. Mineralogical Magazine, 64, 95—111.CrossRefGoogle Scholar
Le Maitre, R.W., editor (1989) A Classification of Igneous Rocks and Glossary of Terms. Blackwell Scientific, Oxford, UK.Google Scholar
Martin, A.R. (1985) The evolution of the Tugtutoq- Ilg´maussaq-Dyke swarm, Southwest Greenland. PhD thesis, University of Edinburgh, UK.Google Scholar
McDonough, W.F. and Sun, S.-S. (1995) The composition of the Earth. Chemical Geology, 120, 223—255.CrossRefGoogle Scholar
Nelson, D.R., Chivas, A.R., Chappell, B.W. and McCullogh, M.T. (1998) Geochemical and isotopic systematics in carbonatites and implications for the evolution of ocean-island sources. Geochimica et Cosmochimica Acta, 52, 1—17.CrossRefGoogle Scholar
Nielsen, T.F.D. and Buchardt, B. (1985) Sr-C-O isotopes in nephelinitic rocks and carbonatites, Gardiner Complex, Tertiary of East Greenland. Chemical Geology, 53, 207—217.CrossRefGoogle Scholar
Paslick, C.R., Halliday, A.N., Davies, G.R., Mezger, K. and Upton, B.G.J. (1993) Timing of Proterozoic magmatism in the Gardar Province, southern Greenlan. Geological Society of America Bulletin, 105, 272—278.2.3.CO;2>CrossRefGoogle Scholar
Patchett, P.J. (1977) Rb-Sr geochronology and geochemistry of Proterozoic basic intrusions in Sweden and South Greenland. PhD thesis, University of Durham, UK.Google Scholar
Pauly, H. (1960) Paragenetic relations in the main cryolite ore of Ivigtut, South-Greenland. Neues Jahrbuch für Mineralogie Abhandlungen, 121 –139. Also reprinted as: Grønlands geologiske Undersøgelse, Misc. Paper 23, (1960).Google Scholar
Pauly, H. and Bailey, J.C. (1999) Genesis and evolution of the Ivigtut cryolite deposit, SW Greenland. Meddelser om Grønland, Geoscience, 37, 60. pp.Google Scholar
Pearce, N.J.G. (1988) The petrology and geochemistry of the Igaliko Dyke swarm, South Greenland. PhD thesis, University of Durham, UK.Google Scholar
Pearce, N.J.G. and Leng, M.J. (1996) The origin of carbonatites and related rocks from the Igaliko Dyke Swarm, Gardar Province, South Greenland: field, geochemical and C-O-Sr-Nd isotope evidence. Lithos, 39, 21—40.CrossRefGoogle Scholar
Pearce, N.J.G., Leng, M.J., Emeleus, C.H. and Bedford, C.M. (1997) The origins of carbonatites and related rocks from the Grønnedal-I´ka Nepheline Syenite complex, South Greenland: C-O-Sr isotope evidence. Mineralogical Magazine, 61, 515—529.CrossRefGoogle Scholar
Pinneau, F., Javoy, M. and Alle`gre, C.J. (1973) Etude systematique des isotopes de l’oxygene, du carbone et du strontium dans les carbonatites. Geochimica et Cosmochimica Acta, 37, 2363—2377.CrossRefGoogle Scholar
Piper, J.D.A., Thomas, D.N., Share, S. and Zhang Qi Ruo (1999) The palaeo magnetism of (Mesoproteroz oic) Eriksfjord Group red beds, South Greenland: multiphase remagnetization during the Gardar and Grenville episodes. Geophysical Journal International, 136, 739—56.CrossRefGoogle Scholar
Ray, J.S., Ramesh, R. and Pande (1999) Carbon isotopes in Kerguelen plume-derived carbonatites: evidence for recycled inorganic carbon. Earth and Planetary Science Letters, 170, 205—214.CrossRefGoogle Scholar
Reid, D.L. and Cooper, A.F. (1992) Oxygen and carbon isotope patterns in the Dicker Willem carbonatite complex, southern Namibia. Chemical Geology (Isotope Geoscience Section), 94, 293—305.CrossRefGoogle Scholar
Rock, N.M.S. (1987) The nature and origin of lamprophyres: an overview. Pp. 191—226 in: Alkaline Igneous Rocks (Fitton, J.G. and Upton, B.G.J., editors), Geological Society of London, Special Publication 30, Blackwell, Oxford, UK.Google Scholar
Schleicher, H., Kramm, U., Pernicka, E., Schidlowski, M., Schmidt, F.V., Todt, S.W. and Viladkar, S.G. (1998) Enriched subcontinental upper mantle beneath southern India: evidence from Pb, Nd, Sr and C-O isotopic studies on Tamil Nadu carbonatites. Journal of Petrology, 39, 1765—1785.CrossRefGoogle Scholar
Stewart, J.W. (1964) The Early Gardar Igneous rocks of the Ilg´maussaq area, South Greenland. PhD thesis, University of Durham, UK.Google Scholar
Stewart, J.W. (1970) Precambrian alkaline-ultramafic/carbonatit e volcanism at Qagssiarssu k, South Greenland. Rapport Grønland geologiske Undersøgelse, 84, (also Meddelelser om Grønland, 186, (4) 70 pp.Google Scholar
Upton, B.G.J. (1991) Gardar mantle xenolith s: Igdlutalik, South Greenland. Rapport, Grønlands geologiske Undersøgelse, 150, 37—43.Google Scholar
Upton, B.G.J. and Blundell, D.J. (1978) The Gardar Igneous Province: evidence for Proterozoic rifting. Pp. 163—172 in: Petrology and Geochemistry of Continental Rifts (Neumann, E.R. and Ramberg, I.B., editors). D. Reidel Publishing Company, Dordrecht, The Netherlands.CrossRefGoogle Scholar
Upton, B.G.J. and Emeleus, C.H. (1987) Mid Proterozoic alkaline magmati sm in southern Greenland. Pp. 449—471 in: Alkaline Igneous Rocks (Fitton, J.G. and Upton, B.G.J., editors). Geological Society of London, Special Publication 30, Blackwells, Oxford, UK.Google Scholar
Upton, B.G.J. and Fitton, J.G. (1985) Gardar Dykes North of the Igaliko Syenite Complex, Southern Greenl and. Rapport, Grønlands geologiske Undersøgelse, 127.Google Scholar
Upton, B.G.J., Emeleus, C.H., Heaman, L.M., Goodenough, K.M. and Finch, A.A. (2003) Magmatism of the mid-Proterozo ic Garda r Province, South Greenland: chronology, petrogenesis and geological setting. Lithos, 68, 43—65.CrossRefGoogle Scholar
Viladkar, S. and Schidlowski, M. (2000) Carbon and oxygen isotope geochemistry of the Amba Dongar carbonatite complex, Gujarat, India. Gondwana Research, 3, 415—424.CrossRefGoogle Scholar
Wallace, M.E. and Green, D.H. (1988) An experimental determination of primary carbonatite magma composition. Nature, 335, 343—346.CrossRefGoogle Scholar
Walton, B.J. (1965) Sanerutian appinitic rocks and Gardar dykes and diatremes, north of Narssarssuaq, South Greenland. Meddelelser om Grønland, 179, 191. pp.Google Scholar
Windley, B.F. (1991) Early Proterozoic collision tectonics, and rapakivi granites and intrusions in an extensional thrust-thickened crust: the Ketilidian orogen, South Greenland. Tectonophysics, 195, 1—10.CrossRefGoogle Scholar
Wyllie, P.J. and Huang, W.-L. (1976) Carbonation and melting reactions in the system CaO-MgO-SiO2-CO2 at mantle pressures with geophysical and petrological applications. Contributions to Mineralogy and Petrology, 54, 79—107.CrossRefGoogle Scholar
Wyllie, P.J. and Lee, W.-J. (1998) Model system controls on conditions for formation of magnesiocarbonatite and calciocarbonatite magmas from the mantle. Journal of Petrology, 39, 1885—1893.CrossRefGoogle Scholar