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Trace-element abundances in the shallow lithospheric mantle of the North Atlantic Craton margin: Implications for melting and metasomatism beneath Northern Scotland

Published online by Cambridge University Press:  02 January 2018

Hannah S. R. Hughes ,
Iain McDonald ,
John W. Faithfull ,
Brian G. J. Upton  and
Hilary Downes
Hannah S. R. Hughes*
Affiliation:
School of Earth and Ocean Sciences, Cardiff University, Main Building, Cardiff CF10 3AT, UK
Iain McDonald
Affiliation:
School of Earth and Ocean Sciences, Cardiff University, Main Building, Cardiff CF10 3AT, UK
John W. Faithfull
Affiliation:
Hunterian Museum and Art Gallery, University of Glasgow, Glasgow G12 8QQ, UK
Brian G. J. Upton
Affiliation:
School of Geosciences, University of Edinburgh, Edinburgh EH9 3JW, UK
Hilary Downes
Affiliation:
Department of Earth and Planetary Sciences, Birkbeck University of London, Malet Street, LondonWC1E 7HX, UK
*
*E-mail: [email protected]
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Abstract

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Bulk rock geochemistry and major- and trace-element compositions of clinopyroxene have been determined for three suites of peridotitic mantle xenoliths from the North Atlantic Craton (NAC) in northern Scotland, to establish the magmatic and metasomatic history of subcontinental lithospheric mantle (SCLM) below this region. Spinel lherzolites from the southernmost locality (Streap Com'laidh) have non-NAC mantle compositions, while the two northern xenolith suites (Loch Roag and Rinibar) are derived from the thinned NAC marginal keel. Clinopyroxene compositions have characteristic trace-element signatures which show both 'primary' and 'metasomatic' origins. We use Zr and Hf abundances to identify ancient cryptic refertilization in 'primary' clinopyroxenes. We suggest that Loch Roag and Rinibar peridotite xenoliths represent an ancient Archaean-Palaeoproterozoic SCLM with original depleted cratonic signatures which were overprinted by metasomatism around the time of intrusion of the Scourie Dyke Swarm (∼2.4 Ga). This SCLM keel was preserved during Caledonian orogenesis, although some addition of material and/or metasomatism probably also occurred, as recorded by Rinibar xenoliths. Rinibar and Streap xenoliths were entrained in Permo-Carboniferous magmas and thus were isolated from the SCLM ∼200 Ma before Loch Roag xenoliths (in an Eocene dyke). Crucially, despite their geographical location, lithospheric mantle peridotite samples from Loch Roag show no evidence of recent melting or refertilization during the Palaeogene opening of the Atlantic.

Keywords

North Atlantic Cratonspinel lherzolitexenolithREEclinopyroxene
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 4 , August 2015 , pp. 877 - 907
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2015 This is an Open Access article, distributed under the terms of the Creative Commons Attribution license. (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

Footnotes

†

Present address: School of Geosciences, University of the Witwatersrand, Private Bag 3, Wits 2050, Johannesburg, South Africa

*

This paper is published as part of a special set in Mineralogical Magazine, Volume 79(4), 2015, arising out of the March 2014 NAC Conference on the North Atlantic Craton.

References

Arndt, N.T. (2013) The lithospheric mantle plays no active role in the formation of orthomagmatic ore deposits. Economic Geology, 108, 1953–1970.CrossRefGoogle Scholar
Barton, PJ. (1992) LISPB revisited: a new look under the Caledonides of northern Britain. Geophysical Journal International, 110, 371–391.CrossRefGoogle Scholar
Baxter, A.N. and Mitchell, J.G. (1984) Camptonite-monchiquite dyke swarms of northern Scotland; age relationships and their implications. Scottish Journal of Geology, 20, 297–308.CrossRefGoogle Scholar
Bernstein, S., Kelemen, P.B. and Brooks, C.K. (1998) Depleted spinel harzburgite xenoliths in Tertiary dykes from East Greenland: Restites from high degree melting. Earth and Planetary Science Letters, 154, 221–235.CrossRefGoogle Scholar
Bernstein, S., Hanghoj, K., Kelemen, P.B. and Brooks, K. (2006) Ultra-depleted shallow cratonic mantle beneath West Greenland: dunitic xenoliths from Ubekendt Ejland. Contributions to Mineralogy and Petrology, 152, 335–347.CrossRefGoogle Scholar
Bernstein, S., Kelemen, P.B. and Hanghoj, K. (2007) Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene. Geology, 35, 459.CrossRefGoogle Scholar
Bernstein, S., Szilas, K and Kelemen, P.B. (2013) Highly depleted cratonic mantle in West Greenland extending into diamond stability field in the Proterozoic. Lithos, 168-169, 160–172.CrossRefGoogle Scholar
Bizzarro, M. and Stevenson, R.K. (2003) Major element composition of the lithospheric mantle under the North Atlantic craton: Evidence from peridotite xenoliths of the Sarfartoq area, southwestern Greenland. Contributions to Mineralogy and Petrology, 146, 223–240.CrossRefGoogle Scholar
Bonadiman, C, Coltorti, M., Duggen, S., Paludetti, L., Siena, F., Thirlwall, M.F. and Upton, B.G.J. (2008) Palaeozoic subduction-related and kimberlite or carbonatite metasomatism in the Scottish lithospheric mantle. Pp. 303–333 in: Metasomatism in Oceanic and Continental Lithospheric Mantle (M. Coltorti and M. Gregoire, editors). The Geological Society, London.Google Scholar
Bridgwater, D., Watson, J. and Windley, B.F. (1973) The Archaean Craton of the North Atlantic Region. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 273, 493–512.Google Scholar
Buchan, K.L., Mertanen, S., Park, R.G., Pesonen, L.J., Elming, S.-A., Abrahamsen, N. and Bylund, G. (2000) Comparing the drift of Laurentia and Baltica in the Proterozoic: the importance of key palaeo-magnetic poles. Tectonophysics, 319, 167–198.CrossRefGoogle Scholar
Davies, J.H.F.L. and Heaman, L.M. (2014) New U-Pb baddeleyite and zircon ages for the Scourie dyke swarm: A long-lived large igneous province with implications for the Paleoproterozoic evolution of NW Scotland. Precambrian Research, 249, 180–198.CrossRefGoogle Scholar
Downes, H. (2007) Origin and significance of spinel and garnet pyroxenites in the shallow lithospherie mantle: Ultramafic massifs in orogenic belts in Western Europe and NW Africa. Lithos, 99, 1–24.CrossRefGoogle Scholar
Downes, H., Upton, B.G.J., Handryde, E.A.J. and Thirlwall, M.F. (2001) Geochemistry of mafic and ultramafic xenoliths from Fidra (Southern Uplands, Scotland): implications for lithospherie processes in Permo—Carboniferous times. Lithos, 58, 105–124.CrossRefGoogle Scholar
Downes, H., Upton, B.G.J., Connolly, J., Beard, A.D. and Bodinier, J.-L. (2007) Petrology and geochemistry of a cumulate xenolith suite from Bute: evidence for late Palaeozoic crudtal uderplating beneath SW Scotland. Journal of the Geological Society, 164, 1–15.CrossRefGoogle Scholar
Downes, H., de Vries, C. and Wittig, N. (2015) Hf-Zr anomalies in clinopyroxene from mantle xenoliths from France and Poland: implications for Lu—Hf dating of spinel peridotite lithospherie mantle. International Journal of Earth Sciences, 104, 89–102 CrossRefGoogle Scholar
Faithfull, J.W., Timmerman, M.J., Upton, B.GJ. and Rumsey, M.S. (2012) Mid-Eocene renewal of magmatism in NW Scotland: the Loch Roag Dyke, Outer Hebrides. Journal of the Geological Society, 169, 115–118.CrossRefGoogle Scholar
Fowler, M.B., Kocks, H., Darbyshire, D.P.F. and Dreenwood, P.B. (2008) Petrogenesis of high Ba-Sr plutons from the Northern Highlands Terrane of the British Caledonian Province. Lithos, 105, 129–148.CrossRefGoogle Scholar
Goodenough, K.M., Macdonald, J.M., Johnson, T.E., Hughes, H.S.R., Shaw, R.A. and Millar, I. (2014) Tectoic history and mineralisation in the North Atlantic Craton: A view from Scotland. North Atlantic Craton Conference, 2014. University of St Andrews, UK.Google Scholar
Goodenough, K.M., Millar, I., Strachan, R.A., Krabbendam, M. and Evans, J.A. (2011) Timing of regional deformation and development of the Moine Thrust Zone in the Scottish Caledonides: constraints from the U-Pb geochronology of alkaline intrusions. Journal of the Geological Society, London, 168, 99–114.CrossRefGoogle Scholar
Green, D.I. and McCallum, D. (2005) Kainosite-(Y) from the Strontian Mines, Highland Region, Scotland. UK Journal of Mines and Minerals, 26, 23–26.Google Scholar
Griffin, W.L. and O'Reilly, S.Y. (1987) Is the continental Moho the crust-mantle boundary. Geology, 15, 241.2.0.CO;2>CrossRefGoogle Scholar
Grove, T.L., Chatterjee N., Parman, S.W. and Medard E. (2006) The influence of H2O on mantle wedge melting. Earth and Planetary Science Letters, 249(12), 74-89.CrossRefGoogle Scholar
Groves, D.I. and Bierlein, F.P. (2007) Geodynamic settings of mineral deposit systems. Journal of the Geological Society, London, 164, 19–30.CrossRefGoogle Scholar
Groves, D.I., Ho, S.E., Rock, N.M.S., Barley, M.E. and Muggeridge, M.T. (1987) Archean cratons, diamond and platinum: Evidence for coupled long-lived crust-mantle systems. Geology, 15, 801–805.2.0.CO;2>CrossRefGoogle Scholar
Gysi, A.P., Jagoutz, O., Schmidt, M.W. and Targuisti, K. (2011) Petrogenesis of pyroxenites and melt infiltrations in the ultramafic complex of Beni Bousera, Northern Morocco. Journal of Petrology, 52, 1679–1735.CrossRefGoogle Scholar
Hanghoj, K., Kelemen, P.B., Bernstein, S., Blusztajn, J. and Frei, R. (2001) Osmium isotopes in the Wiedemann Fjord mantle xenoliths: A unique record of cratonic mantle formation by melt depletion in the Archaean. Geochemistry Geophysics Geosystems, 2, 1–14.CrossRefGoogle Scholar
Hughes, H.S.R., McDonald, I., Goodenough, K.M., Ciborowski, T.J.R., Kerr, A.C., Davies, J.H.F.L. and Selby, D. (2014) Enriched lithospherie mantle keel below the Scottish margin of the North Atlantic Craton: Evidence from the Palaeoproterozoic Scourie Dyke Swarm and mantle xenoliths. Precambrian Research, 250, 97–126.CrossRefGoogle Scholar
Hunter, R.H. and Upton, B.G.J. (1987) The British Isles—a Palaeozoic mantle sample. Pp. 107–118 in: Mantle xenoliths. (Nixon, P.H., editor). John Wiley, Chichester, UK.Google Scholar
Hutchison, M. and Frei, D. (2009) Kimberlite and related rocks from Garnet Lake, West Greenland, including their mantle constituents, diamond occur-rence, age and provenance. Lithos, 112, 318–333.CrossRefGoogle Scholar
Kinny, P.D., Strachan, R.A., Kocks, H. and Friend, C.R.L. (2003) U-Pb geochronology of late Neoproterozoic augen granites in the Moine super-group, NW Scotland: dating of rift-related, felsic magmatism during supercontinent break-up. Journal of the Geological Society, London, 160, 925–934.CrossRefGoogle Scholar
Kinny, P.D., Friend, C.R.L. and Love, G.J. (2005) Proposal for a terrane-based nomenclature for the Lewisian Complex of NW Scotland. Journal of the Geological Society, London, 162, 175–186.CrossRefGoogle Scholar
Kirstein, L.A., Dunai, T.J., Davies, G.R., Upton, B.G.J. and Nikogosian, I.K. (2004) Helium isotope signature of lithospherie mantle xenoliths from the Permo-Carboniferous magmatic province in Scotland—no evidence for a lower-mantle plume. Pp. 243–258 in: Permo-Carboniferous Magmatism and Rifting in Europe (M. Wilson, E.-R. Neumann, G.R. Davies, MJ. Timmerman, M. Heeremans and Larsen, B.T. , editors). Geological Society Special Publications, 223. The Geological Society, London.Google Scholar
Kirstein, L.A., Davies, G.R. and Heeremans, M. (2006) The petrogenesis of Carboniferous—Permian dyke and sill intrusions across northern Europe. Contributions to Mineralogy and Petrology, 152, 721–742.CrossRefGoogle Scholar
Kneller, B.C. (1991) A foreland basin on the southern margin of Iapetus. Journal of the Geological Society, London, 148, 207–210.CrossRefGoogle Scholar
Kolb, I, Dziggel, A. and Schlatter, D.M. (2013) Gold occurrences of the Archean North Atlantic craton, southwestern Greenland: A comprehensive genetic model. Ore Geology Reviews, 54, 29–58.CrossRefGoogle Scholar
Kumar, P., Kind, R., Hanka, W., Wylegalla, K, Reigber, Ch., Yuan, X., Woelbern, I., Schwintzer, P., Fleming, K., Dahl-Jensen, T., Larsen, T.B., Schweitzer, I, Priestley, K., Gudmundsson, O. and Wolf, D. (2005) The lithosphere-asthenosphere boundary in the North-West Atlantic region. Earth and Planetary Science Letters, 236, 249–257.CrossRefGoogle Scholar
Le Breton, E., Cobbold, P.R. and Zanella, A. (2013) Cenozoic reactivation of the Great Glen Fault, Scotland: additional evidence and possible causes. Journal of the Geological Society, 170, 403–415.CrossRefGoogle Scholar
Lloyd, F.E., Edgar, A.D., Forsyth, D.M. and Barnett, R.L. (1991) The paragenesis of upper-mantle xenoliths from the Quaternary voleanies South-East of Gees, West Eifel, Germany. Mineralogical Magazine, 55, 95–112.CrossRefGoogle Scholar
Long, A.M., Menzies, M.A., Thirlwall, M.F., Upton, B.GJ. and Apsen, P. (1991) Carbonatite-mantle interaction: A possible origin for megacryst/xenolith suites in Scotland. In: Proceedings of the Fifth International Kimberlite Conference (H.Meyer, O.A. and Leonardos, O.H. , editors). Brazil.Google Scholar
McDonald, I. and Viljoen, KS. (2006) Platinum-group element geochemistry of mantle eclogites: a reconnaissance study of xenoliths from the Orapa kimberlite, Botswana. Applied Earth Science, 115, 81–93.CrossRefGoogle Scholar
McDonough, W.F. and Sun, S. (1995) The Composition of the Earth. Chemical Geology, 120, 223–253.CrossRefGoogle Scholar
Menzies, M. and Halliday, A. (1988) Lithospheric mantle domains beneath the Archean and Proterozoic crust of Scotland. Journal of Petrology, Special Lithosphere Issue, 275–302.CrossRefGoogle Scholar
Menzies, M.A., Halliday, A.N., Palacz, Z., Hunter, R.N., Upton, B.G.J., Aspen, P. and Hawkesworth, C.J. (1987) Evidence from mantle xenoliths for an enriched lithospheric keel under the Outer Hebrides. Nature, 325, 44–47.CrossRefGoogle Scholar
Mercier, J.-C.C. and Nicolas, A. (1975) Textures and fabrics of upper-mantle peridotites as illustrated by xenoliths from basalts. Journal of Petrology, 16, 454–487.CrossRefGoogle Scholar
Moorhouse, SJ. and Moorhouse, V.E. 1977. A Lewisian basement sheet within the Moine at Ribigill, north Sutherland. Scottish Journal of Geology, 13, 289–300.CrossRefGoogle Scholar
Neilson, J.C., Kokelaar, B.P. and Crowley, Q.G. (2009) Timing, relations and cause of plutonic and volcanic activity of the Siluro-Devonian post-collisions magmatic episode in the Grampian Terrance, Scotland. Journal of the Geological Society, London, 166, 545–561.CrossRefGoogle Scholar
Oliver, G.J.H., Wilde, S.A. and Wan, Y.S. (2008) Geoehronology and geodynamies of Scottish granitoids from the late Neoproterozoic break-up of Rodinia to Palaeozoic collision. Journal of the Geological Society, London, 165, 661–674.CrossRefGoogle Scholar
Park, R.G. (1994) Early Proterozoic tectonic overview of the northern British Isles and neighbouring terrains in Laurentia and Baltica. Precambrian Research, 68, 65–79.CrossRefGoogle Scholar
Park, R.G. (1995) Palaeoproterozoic Laurentia-Baltica relationships: a view from the Lewisian. Pp. 211–224 in: Early Precambrian Processes (Coward, M.P. and Ries, A.C. , editors). Geological Society Sepcial Publications, 95. The Geological Society, London.Google Scholar
Park, R.G. (2005) The Lewisian terraine model: a review. Scottish Journal of Geology, 41, 105–118.CrossRefGoogle Scholar
Pearce, J.A. (1996) A user's guide to basalt discrimination diagrams. Pp. 79–114 in: Trace Element Geochemistry of Volcanic Rocks: Applications for Massive Sulphide Exploration (Wyman, D.A., editor). Geological Association of Canada, Winnipeg, Germany.Google Scholar
Pearson, D.G., Canil, D. and Shirey, S.B. (2003) Mantle samples included in volcanic rocks: Xenoliths and diamonds. Pp. 171–275 in: Treatise on Geochemistry 2. (R.W. Carlso, H.D. Holland and K.K Turekian, editors). Elsevier, Amsterdam.CrossRefGoogle Scholar
Praegel, N.-O. (1981) Origin of ultramafic inclusions and megacrysts in a monchiquite dyke at Streap, Inverness-shire, Scotland. Lithos, 14, 305–322.CrossRefGoogle Scholar
Rollinson, H.R. (1993) Using Geochemical Data: Evaluation, Presentation, Interpretation. Longman, Harlow, UK.Google Scholar
Sand, KK, Waight, T.E., Pearson, D.G., Nielsen, T.F.D., Makovicky, E. and Hutchison, M.T. (2009) The lithospheric mantle below southern West Greenland: A geothermobarometric approach to diamond potential and mantle stratigraphy. Lithos, 111, 1155–1166.CrossRefGoogle Scholar
Saunders, A.D., Fitton, J.G., Kerr, A.C, Norry, MJ. and Kent, R.W. (1997) The North Atlantic Igneous Province. Pp. 45–93 in: Large Igneous Provinces: Continental, Oceanic, and Planetary Flood Volcanism (Mahoney, J.J. and Coffin, M.F. , editors). American Geophysical Union, Washington, D.C. Google Scholar
Szilas, K., van Hinsberg, V.J., Creaser, R.A. and Kisters, A.F. (2014) The geochemical composition of serpentinites in the Mesoarchaean Tartoq Group, SW Greenland: Harzburgitic cumulates or melt-modified mantle. Lithos, 198, 103–116.CrossRefGoogle Scholar
Silver, P.G., Mainprice, D., Ben Ismail, A., Tommasi,, W. and Barruol, G. (1999) Mantle structural geology from seismic anisotropy. Pp. 79–103 in: Mantle petrology: Field observations and high pressure experimentation. A tribute to Francis R. (Joe) Boyd (Y. Fei, C. Bertka and Mysen, B.O. , editors). Geochemical Society, Special Publications.Google Scholar
Stewart, M., Strachan, R.A., Martin, M.W. and Holdsworth, R.E. (2001) Constraints on early sinistral displacements along the Great Glen Fault Zone, Scotland: structural setting U-Pb geochronol-ogy and emplacement of the syn-tectonic Clunes tonalite. Journal of the Geological Society, London. 158, 821–830.CrossRefGoogle Scholar
Stone, P., Floyd, J.D., Barnes, R.P. and Lintern, B.C. (1987) A sequential back-arc and foreland basin thrust duplex model for the Southern Uplands of Scotland. Journal of the Geological Society, London, 144, 753–764.CrossRefGoogle Scholar
Tanner, P.W.G. (1970) The Sgurr Beag Slide-a major tectonic break within the Moinian of the Western Highlands of Scotland. Quarterly Journal of the Geological Society, \l(s, 435-463.Google Scholar
Tappe, S., Foley, S.F., Jenner, G.A., Heaman, L.M., Kjarsgaard, B.A., Romer, R.L., Stracke, A., Joyce and N. Hoefs, J. (2006) Genesis of ultramafic lamprophyres and carbonatites at Aillik Bay, Labrador: a consequence of incipient lithospheric thinning beneath the North Atlantic Craton. Journal of Petrology, 47, 1261–1315.CrossRefGoogle Scholar
Tappe, S., Foley, S.F., Stracke, A., Romer, R.L., Kjarsgaard, B.A., Heaman, L.M. and Joyce, M. (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, 433–454.CrossRefGoogle Scholar
Tappe, S., Smart, K.A., Pearson, D.G., Steenfelt, A. and Simonetti, A. (2011) Craton formation in Late Archean subduction zones revealed by first Greenland eclogites. Geology, 39, 1103–1106.CrossRefGoogle Scholar
Till, C.B., Grove, T.L. and Withers., A.C. (2012) The beginnings of hydrous mantle wedge melting. Contributions to Mineralogy and Petrology, 163, 669–688.CrossRefGoogle Scholar
Tompkins, L.A., Bailey, S.W. and Haggerty, S.E. (1984) Kimberlitic chlorites from Sierra Leone, West Africa; unusual chemistries and structural polytypes. American Mineralogist, 69, 237–249.Google Scholar
Upton, B.J.G., Aspen, P. and Chapman, N.A. (1983) The upper mantle and deep crust beneath the British Isles: evidence from inclusions in volcanic rocks. Journal of the Geological Society, 140, 105–121.CrossRefGoogle Scholar
Upton, B.G.J., Hinton, R.W., Aspen, P., Finch, A. and Valley, J.W. (1999) Megacrysts and Associated Xenoliths: Evidence for Migration of Geochemically Enriched Melts in the Upper Mantle beneath Scotland. Journal of Petrology, 40, 935–956.CrossRefGoogle Scholar
Upton, B.G.J., Stephenson, D., Smedley, P.M., Wallis, S.M., Fitton, J.G. (2004) Carboniferous and Permian magmatism in Scotland. Pp. 195–218 in: Permo-Carboniferous Magmatism and Rifting in Europe (M. Wilson, E.-R. Neumann, G.R. Davies, M.J. Timmerman, M. Heeremans and Larsen, B.T. , editors). Geological Society Special Publications, 223. The Geological Society, London.Google Scholar
Upton, B.G.J., Finch, A.A. and Slaby, E. (2009) Megacrysts and salic xenoliths in Scottish alkali basalts: derivatives of deep crustal intrusions and small-melt fractions from the upper mantle. Mineralogical Magazine, 73(6) 895–908.CrossRefGoogle Scholar
Upton, B.G.J., Downes, H., Kirstein, L.A., Bonadiman, C, Hill, P.G. and Ntaklos, T. (2011) The lithospheric mantle and lower crust-mantle relationships under Scotland: a xenolithic perspective. Journal of the Geological Society, 168, 873–886.CrossRefGoogle Scholar
Vernon, R., Holdsworth, R.E., Selby, D., Dempsey, E., Finlay, A.J. and Fallick, A.E. (2014) Structural characteristics and Re—Os dating of quartz-pyrite veins in the Lewisian Gneiss Complex, NW Scotland: Evidence of an Early Paleoproterozoic hydrothermal regime during terrane amalgamation. Precambrian Research, 246, 256–267.CrossRefGoogle Scholar
Walker, G.P.L. and Ross, J.V. (1954) A xenolithic monchiquite dyke near Glenfinnan, Inverness-shire. Geological Magazine, 91, 463–472.CrossRefGoogle Scholar
Wittig, N., Baker, J.A. and Downes, H. (2006) Dating the mantle roots of young continental crust. Geology, 34, 237.CrossRefGoogle Scholar
Wittig, N., Pearson, D.G., Webb, M., Ottley, C.J., Irvine, G.J., Kopylova, M., Jensen, S.M. and Nowell, G.M. (2008) Origin of cratonic lithospheric mantle roots: A geochemical study of peridotites from the North Atlantic Craton, West Greenland. Earth and Planetary Science Letters, 274, 24–33.CrossRefGoogle Scholar
Wittig, N., Webb, M., Pearson, D.G., Dale, C.W., Ottley, C.J., Hutchison, M., Jensen, S.M. and Luguet, A. (2010) Formation of the North Atlantic Craton: Timing and mechanisms constrained from Re—Os isotope and PGE data of peridotite xenoliths from S.W. Greenland. Chemical Geology, 276, 166–187.CrossRefGoogle Scholar
Young, B.N., Parsons, I. and Threadgould, R. (1994) Carbonatite near the Loch Borralan intrusion, Assynt. Journal of the Geological Society, London, 45, 945–954.CrossRefGoogle Scholar
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