Abstract
We present compositional data on a 1,250-m-thick sequence of sparsely porphyritic lavas that comprise the Geikie Plateau Formation, part of the ~55-Ma break-up-related flood basalts in East Greenland. Major element compositions are relatively restricted (6.3–7.6 wt% MgO; 2.2–2.4 wt% TiO2), with two excursions to more evolved compositions (2.4–3.4 wt% TiO2) that are similar to the inferred parental magma of the nearby Skaergaard Intrusion. Major and trace element calculations show that fractional crystallisation is the principal control on magma compositions, and the cyclical sequential variations imply regular magma chamber replenishment events. Isotopic data indicate minor crustal assimilation, but with different contaminants for the main group (amphibolitic gneiss) and evolved cycles (granulitic gneiss). Rifting episodes may have allowed more primitive magmas to ascend to shallow crustal levels and subsequently fractionate to more evolved compositions in a separate chamber, which was perhaps similar to the source of the Skaergaard Intrusion.
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References
Asimow PD, Ghiorso MS (1998) Algorithmic modifications extending MELTS to calculate subsolidus phase relations. Am Mineral 83:1127–1132
Blundy JD, Wood BJ (1991) Crystal-chemical controls on the partitioning of Sr and Ba between plagioclase feldspar, silicate melts and hydrothermal solutions. Geochim Cosmochim Acta 55:193–209
Brooks CK (1976) The FeO/Fe2O3 ratio of basalt analyses: an appeal for a standardized procedure. Bull Geol Soc Denmark 25:117–120
Brooks CK and field parties (1996) The East Greenland volcanic rifted margin – onshore DLC fieldwork. Greenland Geol Surv Rep 172:95–102
Brooks CK, Larsen LM, Nielsen TFD (1991) Importance of iron-rich tholeiitic magmas at divergent plate margins: a reappraisal. Geology 19:269–272
Carter SR, Evensen NM, Hamilton PJ, O’Nions RK (1978) Neodymium and strontium isotope evidence for crustal contamination of continental volcanics. Science 202:743–747
Christie DM, Carmichael ISE, Langmuir CH (1986) Oxidation states of midocean ridge basalt glasses. Earth Planet Sci Lett 79:397–411
Cohen AS, O’Nions RK, O’Hara MJ (1991) Chronology and mechanisms of depletion in Lewisian granulites. Contrib Mineral Petrol 106:142–153
Cox KG (1980) A model for flood basalt vulcanism. J Petrol 21:629–650
DePaolo DJ (1981) Trace element and isotopic effects of combined wallrock assimilation and fractional crystallization. Earth Planet Sci Lett 153:189–202
Fitton JG, Larsen LM, Saunders AD, Hardarson BJ, Kempton PD (2001) Paleogene continental to oceanic magmatism on the SE Greenland continental margin at 63° N: a review of the Ocean Program Drilling legs 152 and 163. J Petrol 41:951–966
Fujimaki H, Tatsumoto M, Aoki K (1984) Partition coefficients of Hf, Zr and REE between phenocrysts and groundmasses. J Geophys Res Suppl 89:B662-B672
Ghiorso MS, Sack RO (1995) Chemical mass transfer in magmatic processes IV. A revised and internally consistent thermodynamic model for the interpolation of liquid-solid equilibria in magmatic systems at elevated temperatures and pressures. Contrib Mineral Petrol 119:197–212
Hansen H, Nielsen TFD (1999) Crustal contamination in Paleogene East Greenland flood basalts: plumbing system evolution during continental rifting. Chem Geol 157:89–118
Hansen H, Pedersen AK, Duncan RA, Bird DK, Brooks CK, Fawcett JJ, Gittins J, Gorton MP O’Day P (2002) Volcanic stratigraphy of the southern Prinsen af Wales Bjerge region. In: Jolley DW, Bell BR (eds) The North Atlantic Igneous Province: stratigraphy, tectonic, volcanic and magmatic processes East Greenland. Geol Soc Spec Publ 197
Hardarson BJ, Fitton JG, Ellam RM, Pringle MS (1997) Rift relocation—a geochemical and geochronological investigation of a palaeo-rift in Northwest Iceland. Earth Planet Sci Lett 153:181–196
Hirschmann MM, Renne PR, McBirney AR (1997) 40Ar/39Ar dating of the Skaergaard intrusion. Earth Planet Sci Lett 146:645–658
Holbrook WS, Larsen HC, Korenaga J, Dahl-Jensen T, Reid ID, Kelemen PB, Hopper JR, Kent GM, Lizarralde D, Bernstein S, Detrick RS (2001) Mantle thermal structure and active upwelling during continental breakup in the North Atlantic. Earth Planet Sci Lett 190:251–262
Irvine TN, Andersen JCØ, Brooks CK (1998) Included blocks (and blocks within blocks) in the Skaergaard intrusion: geologic relations and the origins of rhythic modally graded units. GSA Bull 110:1398–1447
Jang YD, Naslund HR (2001) Major and trace element composition of Skaergaard plagioclase; geochemical evidence for changes in magma dynamics during the final stage of crystallization of the Skaergaard intrusion. Contrib Mineral Petrol 140:441–457
Kystol J, Larsen LM (1999) Analytical procedures in the Rock Geochemical Laboratory of the Geological Survey of Denmark and Greenland. Greenland Geol Surv Bulletin 184:59–62
Larsen HC, Saunders AD, Clift PD (1994) Proceedings of the Ocean Drilling Project. Initial reports Leg 152. College Station, Texas
Larsen LM, Watt WS (1985) Episodic volcanology during break-up of the North Atlantic: evidence from the East Greenland plateau basalts. Earth Planet Sci Lett 73:105–116
Larsen LM, Watt WS, Watt M (1989) Geology and petrology of the Lower Tertiary plateau basalts of the Scoresby Sund area, East Greenland. Greenland Geol Surv Bull 157, 164 pp
Leeman WD, Dasch EJ, Kays MA (1976) 207Pb/204Pb whole rock age of gneisses from the Kangerdlugssuaq area, eastern Greenland. Nature 263:469–471
Lesher CE, Blichert-Toft J, Stecher O (2003) Mantle sources and contamination of the basalts of the North Atlantic Igneous Province. J Petrol (in press)
Longhi J, Walker D, Hays JF (1978) The distribution of Fe and Mg between olivine and lunar basaltic liquids. Geochim Cosmochim Acta 42:1545–1568
McBirney AR (1985) Igneous petrology. Freeman Cooper, San Fransisco
McKenzie D, O’Nions RK (1991) Partial melt distributions from inversion of rare earth element concentrations. J Petrol 32:1021–1091
Nielsen TFD (1981) The ultramafic cumulate series, Gardiner Complex, East Greenland - Cumulates in a shallow level magma chamber of nephelinitic volcano. Contrib Mineral Petrol 76:60–72
Nielsen TFD (2004) The Shape and Volume of the Skaergaard Intrusion, Greenland: Implications for Mass Balance and Bulk Composition. J Petrol 45:507–530
O’Hara MJ (1977) Geochemical evolution during fractional crystallisation of a periodically refilled magma chamber. Nature 266:503–507
O’Hara MJ, Matthews RE (1981) Geochemical evolution in an advancing, periodically replenished, continuously fractionated magma chamber. J Geol Soc Lond 138:237–277
Peate DW, Baker JA, Blichert-Toft J, Hilton DR, Storey M, Kent AJR, Brooks CK, Hansen H, Pedersen AK, Duncan RA (2003) The Prinsen af Wales Bjerge Formation lavas, East Greenland: the transition from tholeiitic to alkalic magmatism during Palaeogene continental break-up. J Petrol 44:279–304
Peate DW, Stecher O (2003) Isotope evidence for contributions from different Iceland mantle components to Palaeogene East Greenland flood basalts. Lithos 67:39–52
Pedersen AK, Watt M, Watt WS, Larsen LM (1997) Structure and stratigraphy of the Early Tertiary basalts of the Blosseville Kyst, East Greenland. J Geol Soc Lond 154:565–570
Roeder PL, Emslie RF (1970) Olivine-liquid equilibrium. Contrib Mineral Petrol 29:275–289
Saunders AD, Fitton JG, Kerr AC, Norry MJ, Kent RW (1997) The North Atlantic Igneous Province. In: Mahoney JJ, Coffin MF (eds) Large igneous provinces. Geophys Monogr Am Geophys Union 100:45–94
Shimizu N, le Roex AP (1986) The chemical zoning of augite phenocrysts in alkaline basalts from Gough Island, South Atlantic. J Volcanol Geotherm Res 29:159–188
Stecher O, Carlson RW, Gunnarson B (1999) Torfajökull: a radiogenic end-member of the Iceland Pb-isotopic array. Earth Planet Sci Lett 165:117–127
Stewart BJ, DePaolo DJ (1990) Isotopic studies of processes in mafic magma chambers: II. The Skaergaard intrusion, East Greenland. Contrib Mineral Petrol 104:125–141
Storey M, Duncan RA, Larsen HC, Pedersen AK, Waagstein R, Larsen LM, Tegner C, Lesher CE (1996) Impact and rapid flow of the Iceland plume beneath Greenland at 61 Ma. EOS Trans Am Geophys Union 77:839
Stormer JC, Nicholls J (1978) XLFRAC: A program for the interactive testing of magmatic differentiation models. Comp Geosci 4:143–159
Sun SS, McDonough WF (1995) The composition of the Earth. Chem Geol 120:223–253
Taylor PN, Kalsbeek F, Bridgwater D (1992) Discrepancies between neodymium, lead and strontium model ages from the Precambrian of Southern Greenland: evidence for a Proterozoic granulite-facies event affecting Archean gneisses. Chem Geol 94:281–291
Taylor SR, McLennan SM (1995) The geochemical evolution of the continental crust. Rev Geophys 33:241–265
Tegner C, Duncan RA, Bernstein S, Brooks CK, Bird DK, Storey M (1998a) 40Ar/39Ar geochronology of Tertiary mafic intrusions along the East Greenland rifted margin: relation to flood basalts and the Iceland hotspot track. Earth Planet Sci Lett 156:75–88
Tegner C, Lesher CE, Larsen LM, Watt WS (1998b) Evidence from the rare-earth-element record of mantle melting cooling of the Tertiary Iceland Plume. Nature 395:591–594
Thirlwall MF, Upton BGJ, Jenkins C (1994) Interaction between continental lithosphere and the Iceland plume – Sr-Nd-Pb isotope geochemistry of the Tertiary Basalts, NE Greenland. J Petrol 35:839–879
Topliss MJ, Carroll MR (1996) Differentiation of ferro-basaltic magmas under conditions open and closed to oxygen: implication for the Skaergaard intrusion and other natural systems. J Petrol 37:837–858
Wager LR (1960) The major element variation of the layered series of the Skaergaard intrusion and a re-estimation of the average composition of the hidden layered series and of the successive residual magmas. J Petrol 1:364–398
Wager LR, Brown GM (1968) Layered igneous rocks. Oliver and Boyd, London
Wager LR, Hamilton EI (1964) Some radiometric rock ages and the problem of the southward continuation of the East Greenland Caledonian Orogeny. Nature 204:1079–1080
Wedepohl KH (1995) The composition of the continental crust. Geochim Cosmochim Acta 59:1217–1232
Wedepohl KH, Heinrichs H, Bridgwater D (1991) Chemical characteristics and genesis of the quartz-feldspathic rocks in the Archean crust of Greenland. Contrib Mineral Petrol 107:163–179
Wright TL, Doherty PC (1970) A linear programming and least squares computer method for solving petrological mixing problems. Bull Geol Soc Am 81:1995–2008
Yang H-J, Kinzler RJ, Grove TL (1996) Experiments and models of anhydrous basaltic olivine-plagioclase-augite saturated melts from 0.001 to 10 kbar. Contrib Mineral Petrol 129:1–18
Acknowledgements
This study formed part of the first author’s MSc. project at the Geological Institute of the University of Copenhagen and the Danish Lithosphere Centre, funded by the Danish National Research Foundation. Joel Baker and Tod Waight are thanked for help with the isotope analyses, and Andy Saunders and Godfrey Fitton are thanked for their helpful journal reviews. Editorial handling: Ian Parsons.
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Andreasen, R., Peate, D.W. & Brooks, C.K. Magma plumbing systems in large igneous provinces: Inferences from cyclical variations in Palaeogene East Greenland basalts. Contrib Mineral Petrol 147, 438–452 (2004). https://doi.org/10.1007/s00410-004-0566-2
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DOI: https://doi.org/10.1007/s00410-004-0566-2