Hostname: page-component-77c89778f8-fv566 Total loading time: 0 Render date: 2024-07-20T00:56:21.482Z Has data issue: false hasContentIssue false
  • English
  • Français

Depleted and ultradepleted basalt and picrite in the Davis Strait: Paleocene volcanism associated with a transform continental margin

Published online by Cambridge University Press:  01 April 2020

Lotte Melchior Larsen Open the ORCID record for Lotte Melchior Larsen [Opens in a new window]  and
Marie-Claude Williamson
Lotte Melchior Larsen*
Affiliation:
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350Copenhagen, Denmark
Marie-Claude Williamson
Affiliation:
NRCan-Geological Survey of Canada, 601 Booth Street, Ottawa, ON, K1A 0E8, Canada
*
Author for correspondence: Lotte Melchior Larsen, Email: lml@geus.dk
Get access Rights & Permissions [Opens in a new window]

Abstract

Volcanic rocks from the Davis Strait were studied to elucidate the tectonomagmatic processes during rifting and the start of seafloor spreading, and the formation of the Ungava transform zone between Canada and Greenland. The rocks are from the wells Hekja O-71, Gjoa G-37, Nukik-2 and Hellefisk-1, and from dredges on the northern Davis Strait High. Ages range from Danian to Thanetian (dinocyst palynozones P2 to P5, 62.5–57.2 Ma). The rocks are predominantly basaltic, but include picrites on the Davis Strait High. Calculated mantle potential temperatures for the Davis Strait High are c. 1500°C, suggesting the volume of magma generated was large; this is consistent with geophysical evidence for magmatic underplating in the region. The rare earth element patterns indicate residual mantle lithologies of spinel peridotite and, together with Sr–Nd isotopes, indicate melting beneath regionally extensive, depleted asthenosphere beneath a lithosphere of thickness similar to, or thinner than, beneath Baffin Island and distinctly thinner than beneath West Greenland. Some sites include basalts with more enriched compositions. Depleted and enriched basalts in the Hellefisk well show contemporaneous melting of depleted and enriched mantle components in the asthenosphere. The Hekja and Davis Strait High basalts and picrites have unique, ultradepleted compositions with (La/Sm)N < 0.5, (Tb/Lu)N < 1 and Nb/Zr = 0.013–0.027. We interpret these compositions as a product of the melting regime within the Ungava transform zone, where the melting column would be steep-sided in cross-section and not triangular as expected at normal spreading ridges. Magmatism along the transform stopped when the tectonic regime changed from transtension to transpression during earliest Eocene time.

Keywords

continental break-upNorth AtlantictectonomagmaticdrillingdredgingGreenlandCanada
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 12 , December 2020 , pp. 1983 - 2003
Copyright
© Cambridge University Press 2020

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Abdelmalak, MM, Planke, S, Polteau, S, Harz, EH, Faleide, JI, Tegner, C, Jerram, DA, Millett, JM and Myklebust, R (2019) Breakup volcanism and plate tectonics in the NW Atlantic. Tectonophysics 760, 267–96, doi: 10.1016/j.tecto.2018.08.002.CrossRefGoogle Scholar
Albarède, F (1992) How deep do common basaltic magmas form and differentiate? Journal of Geophysical Research 97(B7), 10997–1009.CrossRefGoogle Scholar
Balkwill, HR, Mcmillan, NJ, Maclean, B, Williams, GL and Srivastava, SP (1990) Geology of the Labrador Shelf, Baffin Bay, and Davis Strait. In Geology of the Continental Margin of Eastern Canada (eds Keen, MJ & Williams, GL), pp. 293–348. Geological Survey of Canada, Geology of Canada no. 2.Google Scholar
Chalmers, JA and Laursen, KH (1995) Labrador Sea: The extent of continental crust and the timing of the start of sea-floor spreading. Marine and Petroleum Geology 12, 205–17.CrossRefGoogle Scholar
Chalmers, JA and Pulvertaft, TCR (2001) Development of the continental margins of the Labrador Sea: a review. In Non-volcanic Rifting of Continental Margins: A Comparison of Evidence from Land and Sea (eds Wilson, RCL, Whitmarsh, RB, Taylor, B and Froitzheim, N), pp. 77–105. Geological Society of London Special Publication no. 187.Google Scholar
Chauvet, F, Geoffroy, L, Guillou, H, Maury, RC, Le Gall, B, Agranier, A and Viana, A (2019) Eocene continental breakup in the Baffin Bay. Tectonophysics 757, 170–86, doi: 10.1016/j.tecto.2019.03.003.CrossRefGoogle Scholar
Clarke, DB, Cameron, BI, Muecke, GK and Bates, JL (1989) Early Tertiary basalts from the Labrador Sea floor and the Davis Strait region. Canadian Journal of Earth Sciences 26, 956–68.Google Scholar
Clarke, DB and Pedersen, AK (1976) Tertiary volcanic province of West Greenland. In Geology of Greenland (eds Escher, A and Watt, WS), pp. 364–85. Copenhagen: Geological Survey of Greenland.Google Scholar
Clarke, DB and Upton, BGJ (1971) Tertiary basalts of Baffin Island: field relations and tectonic setting. Canadian Journal of Earth Sciences 8, 248–58.CrossRefGoogle Scholar
Dalhoff, F, Larsen, LM, Ineson, J, Stouge, S, Bojesen-Koefoed, J, Lassen, S, Kuijpers, J, Rasmussen, JA and Nøhr-Hansen, H (2006) Continental crust in the Davis Strait: new evidence from seabed sampling. Geological Survey of Denmark and Greenland Bulletin 10, 33–36.CrossRefGoogle Scholar
Dam, G, Pedersen, GK, Sønderholm, MS, Midtgaard, HH, Larsen, LM, Nøhr-Hansen, H and Pedersen, AK (2009) Lithostratigraphy of the Cretaceous–Paleocene Nuussuaq Group, Nuussuaq Basin, West Greenland. Geological Survey of Denmark and Greenland Bulletin 19, 1–171.CrossRefGoogle Scholar
Deutsch, ER, Kristjansson, LG and May, BT (1971) Remanent magnetism of lower Tertiary lavas on Baffin Island. Canadian Journal of Earth Sciences 8, 1542–52.CrossRefGoogle Scholar
Faure, G (1986) Principles of Isotope Geology. New York: John Wiley (2nd edition), 589 pp.Google Scholar
Fitton, JG, Saunders, AD, Larsen, LM, Hardarson, BS and Norry, MJ (1998) Volcanic rocks from the Southeast Greenland margin at 63°N: composition, petrogenesis and mantle sources. In Proceedings of the Ocean Drilling Program (eds Saunders, AD, Larsen, HC and Wise, SH), pp. 331–50. College Station, TX (Ocean Drilling Program), Scientific Results no. 152.Google Scholar
Fitton, JG, Saunders, AD, Norry, MJ, Hardarson, BS and Taylor, RN (1997) Thermal and chemical structure of the Iceland plume. Earth and Planetary Science Letters 153, 197–208.CrossRefGoogle Scholar
Francis, D (1985) The Baffin Bay lavas and the value of picrites as analogues of primary magmas. Contributions to Mineralogy and Petrology 89, 144–54.CrossRefGoogle Scholar
Frei, R, Bridgwater, D, Rosing, M and Stecher, O (1999) Controversial Pb–Pb and Sm–Nd isotope results in the early Archean Isua (West Greenland) oxide iron formation: preservation of primary signatures versus secondary disturbances. Geochimica et Cosmochimica Acta 63, 473–88.Google Scholar
Funck, T, Gohl, K, Damm, V and Heyde, I (2012) Tectonic evolution of southern Baffin Bay and Davis Strait: results from a seismic refraction transect between Canada and Greenland. Journal of Geophysical Research 117, B04107, doi: 10.1029/2011JB009110, 24 pp.CrossRefGoogle Scholar
Funck, T, Jackson, HR, Louden, KE and Klingelhöfer, F (2007) Seismic study of the transform-rifted margin in Davis Strait between Baffin Island (Canada) and Greenland: what happens when a plume meets a transform. Journal of Geophysical Research 112, B04402, doi: 10.1029/2006JB004308, 22 pp.CrossRefGoogle Scholar
Gerlings, J, Funck, T, Jackson, R, Louden, KE and Klingelhöfer, F (2009) Seismic evidence for plume-derived volcanism during formation of the continental margin in southern Davis Strait and northern Labrador Sea. Geophysical Journal International 176, 980–94, doi: 10.1111/j.1365-246x.2008.04021.x.CrossRefGoogle Scholar
Gouiza, M and Paton, DA (2019) The role of inherited lithospheric heterogeneities in defining the crustal architecture of rifted margins and the magmatic budget during continental breakup. Geochemistry, Geophysics, Geosystems 20, 1836–53, doi: 10.1029/2018GC007808.CrossRefGoogle Scholar
Govindaraju, K (1994) 1994 compilation of working values and sample descriptions for 383 geostandards. Geostandards Newsletter 18, Special Issue 1, 1–158.CrossRefGoogle Scholar
Gregersen, U and Bidstrup, T (2008) Structures and hydrocarbon prospectivity in the northern Davis Strait area, offshore West Greenland. Petroleum Geoscience 14, 151–66.CrossRefGoogle Scholar
Gregersen, U, Knutz, PC, Nøhr-Hansen, H, Sheldon, E and Hopper, JR (2019) Tectonostratigraphy and evolution of the West Greenland continental margin. Bulletin of the Geological Society of Denmark 67, 1–21.CrossRefGoogle Scholar
Hald, N and Larsen, JG (1987) Early Tertiary, low potassium tholeiites from exploration wells on the West Greenland shelf. Rapport Grønlands Geologiske Undersøgelse 136, 25 pp.Google Scholar
Hékinian, R, Bideau, D, Hébert, R and Niu, Y (1995) Magmatism in the Garrett transform fault (East Pacific Rise near 13°27′S). Journal of Geophysical Research 100(B7), 10163–185.CrossRefGoogle Scholar
Henderson, G, Schiener, EJ, Risum, JB, Croxton, CA and Andersen, BB (1981) The West Greenland Basin. In Geology of the North Atlantic Borderlands (ed. Kerr, JW), pp. 399–428. Canadian Society of Petroleum Geologists, Calgary, Memoir no. 7.Google Scholar
Heron, PJ, Peace, AL, McCaffrey, KJW, Welford, JK, Wilson, R, van Hunen, J and Pysklywec, RN (2019) Segmentation of rifts through structural inheritance: creation of the Davis Strait. Tectonics 38, 2411–30, doi: 10.1029/2019TC005578.CrossRefGoogle Scholar
Herzberg, C and Asimow, PD (2015) PRIMELT3 MEGA.XLSM software for primary magma calculation: Peridotite primary magma MgO contents from the liquidus to the solidus. Geochemistry, Geophysics, Geosystems 16, 563–78, doi: 10.1002/2014GC005631.CrossRefGoogle Scholar
Herzberg, C and Gazel, E (2009) Petrological evidence for secular cooling in mantle plumes. Nature 458, 619–23.CrossRefGoogle ScholarPubMed
Hole, MJ and Millett, JM (2016) Controls of mantle potential temperature and lithospheric thickness on magmatism in the North Atlantic Igneous Province. Journal of Petrology 57, 417–36, doi: 10.1093/petrology/egw014.CrossRefGoogle Scholar
Hole, MJ, Millett, JM, Rogers, NW and Jolley, DW (2015) Rifting and mafic magmatism in the Hebridean basins. Journal of the Geological Society, London 172, 218–36, doi: 10.1144/jgs2014-100.CrossRefGoogle Scholar
Hole, MJ and Natland, JH (2019) Magmatism in the North Atlantic Igneous Province; mantle temperatures, rifting and geodynamics. Earth-Science Reviews, ISSN 0012-8252, doi: 10.1016/j.earscirev.2019.02.011.Google Scholar
Holm, PM, Gill, RCO, Pedersen, AK, Larsen, JG, Hald, N, Nielsen, TFD and Thirlwall, MF (1993) The Tertiary picrites of West Greenland: contributions from ‘Icelandic’ and other sources. Earth and Planetary Science Letters 115, 227–44.CrossRefGoogle Scholar
Honnorez, J, Bohlke, JK and Honnorez-Guerstein, BM (1978) Petrographical and geochemical study of the low temperature submarine alteration of basalt from Hole 396B, Leg 46. In Initial Reports of the Deep Sea Drilling Project 46 (eds Dmitriev, L and Heirtzler, J), pp. 299–329.Google Scholar
Hosseinpour, M, Müller, RD, Williams, SE and Whittaker, JM (2013) Full-fit reconstruction of the Labrador Sea and Baffin Bay. Solid Earth 4, 461–79, doi: 10.5194/se-4-461-2013.CrossRefGoogle Scholar
Jauer, CD, Oakey, GN and Li, Q (2019) Western Davis Strait, a volcanic transform margin with petroliferous features. Marine and Petroleum Geology 107, 59–80, doi: 10.1016/j.marpetgeo.2019.05.004.CrossRefGoogle Scholar
Keen, CE, Dickie, K and Dafoe, LT (2018a) Structural characteristics of the ocean-continent transition along the rifted continental margin, offshore central Labrador. Marine and Petroleum Geology 89, 443–63, doi: 10.1016/j.marpetgeo.2017.10.012.CrossRefGoogle Scholar
Keen, CE, Dickie, K and Dafoe, LT (2018b) Structural evolution of the rifted margin off northern Labrador: the role of hyperextension and magmatism. Tectonics 37, 1955–72, doi: 10.1029/2017TC004924.CrossRefGoogle Scholar
Keen, CE, Dickie, K and Dehler, SA (2012) The volcanic margins of the Labrador Sea: insights to the rifting process. Tectonics 31, TC1011, doi: 10.1029/2011TC002985, 13 pp.Google Scholar
Kent, AJR, Stolper, EM, Francis, D, Woodhead, J, Frei, R and Eiler, J (2004) Mantle heterogeneity during the formation of the North Atlantic Igneous Province: constraints from trace element and Sr-Nd-Os-O isotope systematics of Baffin Island picrites. Geochemistry, Geophysics, Geosystems 5, doi: 10.1029/2004GC000743, 26 pp.CrossRefGoogle Scholar
Klose, GW, Malterre, E, Mcmillan, NJ and Zinkan, CG (1982) Petroleum exploration offshore southern Baffin Island, northern Labrador Sea, Canada. In Arctic Geology and Geophysics (eds Embry, AF and Balkwill, HR), pp. 233–44. Canadian Society of Petroleum Geologists, Calgary, Memoir no. 8.Google Scholar
Knudsen, C, Gregersen, U, Kokfelt, TF, Olivarius, M and Thomsen, TB (2019) A mid-Cretaceous alkaline volcano in the Davis Strait. Canadian Journal of Earth Sciences, doi: 10.1139/cjes-2018-0307, 18 pp.Google Scholar
Kystol, J and Larsen, LM (1999) Analytical procedures in the Rock Geochemical Laboratory of the Geological Survey of Denmark and Greenland. Geology of Greenland Survey Bulletin 184, 59–62.CrossRefGoogle Scholar
Larsen, JG (1977) Transition from low potassium olivine tholeiites to alkali basalts on Ubekendt Ejland. Meddelelser om Grønland 200, 42 pp.Google Scholar
Larsen, LM and Dalhoff, F (2006) Composition, age, and geological and geotectonic significance of igneous rocks dredged from the northern Labrador Sea and the Davis Strait. Danmarks og Grønlands Geologiske Undersøgelse Rapport 2006/43, 51 pp + appendices.Google Scholar
Larsen, LM and Dalhoff, F (2007) Composition and significance of igneous rocks dredged in 2006 from the northern Labrador Sea and the Davis Strait. Danmarks og Grønlands Geologiske Undersøgelse Rapport 2007/67, 29 pp + appendix.Google Scholar
Larsen, LM, Fitton, JG and Fram, MS (1998) Volcanic rocks of the Southeast Greenland margin in comparison with other parts of the N Atlantic Tertiary volcanic province. In Proceedings of Ocean Drilling Program (eds Saunders, AD, Larsen, HC and Wise, SH), pp. 315–30. College Station, TX, Ocean Drilling Program, Scientific Results no. 152.Google Scholar
Larsen, LM, Heaman, LM, Creaser, RA, Duncan, AR, Frei, R and Hutchison, M (2009) Tectonomagmatic events during stretching and basin formation in the Labrador Sea and the Davis Strait: evidence from age and composition of Mesozoic to Palaeogene dyke swarms in West Greenland. Journal of the Geological Society, London 166, 999–1012, doi: 10.1144/0016-76492009-038.CrossRefGoogle Scholar
Larsen, LM and Pedersen, AK (2009) Petrology of the Paleocene picrites and flood basalts on Disko and Nuussuaq, West Greenland. Journal of Petrology 50, 1667–11, doi: 10.1093/petrology/egp048.CrossRefGoogle Scholar
Larsen, LM, Pedersen, AK, Sundvoll, B and Frei, R (2003) Alkali picrites formed by melting of old metasomatised lithospheric mantle: Manîtdlat Member, Paleocene of West Greenland. Journal of Petrology 44, 3–38.CrossRefGoogle Scholar
Larsen, LM, Pedersen, AK, Tegner, C, Duncan, RA, Hald, N and Larsen, JG (2016) Age of Tertiary volcanic rocks on the West Greenland continental margin: volcanic evolution and event correlation to other parts of the North Atlantic Igneous Province. Geological Magazine 153, 487–511, doi 10.1017/S0016756815000515.CrossRefGoogle Scholar
McCulloch, MT, Gregory, RT, Wasserburg, GJ and Taylor, HP (1980) A neodymium, strontium and oxygen isotopic study of the Cretaceous Samail ophiolite and implications for the petrogenesis and seawater-hydrothermal alteration of oceanic crust. Earth and Planetary Science Letters 46, 201–11.CrossRefGoogle Scholar
McDonough, WF and Sun, S-S (1995) The composition of the Earth. Chemical Geology 120, 223–53.CrossRefGoogle Scholar
McKenzie, D and O’Nions, RK (1991) Partial melt distributions from inversion of rare earth element concentrations. Journal of Petrology 32, 1021–91.CrossRefGoogle Scholar
Mercier de Lépinay, M, Loncke, L, Basile, C, Roest, W, Patriat, M, Maillard, A and De Clarens, P (2016) Transform continental margins – Part 2: A worldwide review. Tectonophysics 693, 96–115, doi: 10.1016/j.tecto.2016.05.038.CrossRefGoogle Scholar
Michael, PJ and Graham, DW (2015) The behavior and concentration of CO2 in the suboceanic mantle: Inferences from undegassed ocean ridge and ocean island basalts. Lithos 236–237, 338–51, doi: 10.1016/j.tecto.2016.05.038.CrossRefGoogle Scholar
Nelson, CE, Jerram, DA, Clayburn, JAP, Halton, AM and Roberge, J (2015) Eocene volcanism in offshore southern Baffin Bay. Marine and Petroleum Geology 67, 678–91, doi: 10.1016/j.marpetgeo.2015.06.002.CrossRefGoogle Scholar
Nøhr-Hansen, H (2003) Dinoflagellate cyst stratigraphy of the Palaeogene strata from the Hellefisk-1, Ikermiut-1, Kangâmiut-1, Nukik-1, Nukik-2 and Qulleq-1 wells, offshore West Greenland. Marine and Petroleum Geology 20, 987–1016.CrossRefGoogle Scholar
Nøhr-Hansen, H, Williams, G and Fensome, RA (2016) Biostratigraphic correlation of the western and eastern margins of the Labrador–Baffin Seaway and implications for the regional geology. Geological Survey of Denmark and Greenland Bulletin 37, 73 pp + appendices.CrossRefGoogle Scholar
Oakey, GN and Chalmers, JA (2012) A new model for the Paleogene motion of Greenland relative to North America: Plate reconstructions of the Davis Strait and Nares Strait regions between Canada and Greenland. Journal of Geophysical Research 117, B10401, 28 pp, doi: 10.1029/2011JB008942.CrossRefGoogle Scholar
Ottley, CJ, Pearson, DG and Irvine, GJ (2003) A routine method for the dissolution of geological samples for the analysis of REE and trace elements via ICP-MS. In Plasma Source Mass Spectrometry: Applications and Emerging Technologies (eds Holland, JG and Tanner, SD), pp. 221–30. Cambridge: Royal Society of Chemistry.CrossRefGoogle Scholar
Peace, A, McCaffrey, K, Imber, J, van Hunen, J, Hobbs, R and Wilson, R (2018) The role of pre-existing structures during rifting, continental breakup and transform system development, offshore West Greenland. Basin Research 30, 373–94, doi: 10.1111/bre.12257.CrossRefGoogle Scholar
Peace, AL, Foulger, GR, Schiffer, C and McCaffrey, KJW (2017) Evolution of the Labrador Sea–Baffin Bay: plate or plume processes? Geoscience Canada 44, 91–102, doi: 10.12789/geocanj.2017.44.120.CrossRefGoogle Scholar
Pedersen, AK and Larsen, LM (1987) Early Tertiary volcanic rocks from eastern Disko and south-eastern Nûgssuaq. Rapport Grønlands geologiske Undersøgelse 135, 11–17.Google Scholar
Pedersen, AK, Larsen, LM and Pedersen, GK (2017) Lithostratigraphy, geology and geochemistry of the volcanic rocks of the Vaigat Formation on Disko and Nuussuaq, Paleocene of West Greenland. Geological Survey of Denmark and Greenland Bulletin 39, 244 pp.Google Scholar
Pedersen, AK, Larsen, LM and Pedersen, GK (2018) Lithostratigraphy, geology and geochemistry of the volcanic rocks of the Maligât Formation and associated intrusions on Disko and Nuussuaq, Paleocene of West Greenland. Geological Survey of Denmark and Greenland Bulletin 40, 239 pp.CrossRefGoogle Scholar
Pedersen, AK, Larsen, LM, Riisager, P and Dueholm, KS (2002) Rates of volcanic deposition, facies changes and movements in a dynamic basin: the Nuussuaq Basin, West Greenland, around the C27n–C26r transition. In The North Atlantic Igneous Province: Stratigraphy, Tectonics, Volcanic and Magmatic Processes (eds Jolley, DW and Bell, BR), pp. 157–81. Geological Society of London, Special Publication no. 197.Google Scholar
Perfit, MR, Fornari, DJ, Ridley, WI, Kirk, PD, Casey, J, Kastens, KA, Reynolds, JR, Edwards, M, Desonie, D, Shuster, R and Paradis, S (1996) Recent volcanism in the Siqueros transform fault: picritic basalts and implications for MORB magma genesis. Earth and Planetary Science Letters 141, 91–108.CrossRefGoogle Scholar
Pichler, T, Ridley, WI and Nelson, E (1999) Low-temperature alteration of dredged volcanics from the Southern Chile Ridge: additional information about early stages of sea-floor alteration. Marine Geology 159, 155–77.CrossRefGoogle Scholar
Reid, ID and Jackson, HR (1997) A review of three transform margins off eastern Canada. Geo-Marine Letters 17, 87–93.CrossRefGoogle Scholar
Robillard, I, Francis, D and Ludden, JN (1992) The relationship between E- and N-type magmas in the Baffin Bay lavas. Contributions to Mineralogy and Petrology 112, 230–41.CrossRefGoogle Scholar
Roest, WR and Srivastava, SP (1989) Sea-floor spreading in the Labrador Sea: a new reconstruction. Geology 17, 1000–3.2.3.CO;2>CrossRefGoogle Scholar
Skaarup, N (2002) Evidence for continental crust in the offshore Palaeogene volcanic province, central West Greenland. Geology of Greenland Survey Bulletin 191, 97–102.CrossRefGoogle Scholar
Skaarup, N, Jackson, HR and Oakey, G (2006) Margin segmentation of Baffin Bay/Davis Strait, eastern Canada based on seismic reflection and potential field data. Marine and Petroleum Geology 23, 127–44.CrossRefGoogle Scholar
Sørensen, AB (2006) Stratigraphy, structure and petroleum potential of the Lady Franklin and Maniitsoq Basins, offshore southern West Greenland. Petroleum Geoscience 12, 221–34.CrossRefGoogle Scholar
Srivastava, SP (1978) Evolution of the Labrador Sea and its bearing on the early evolution of the North Atlantic. Royal Astronomical Society, Geophysical Journal 52, 313–57.CrossRefGoogle Scholar
Srivastava, SP, MacLean, B, Macnab, RF and Jackson, HR (1982) Davis Strait: structure and evolution as obtained from a systematic geophysical survey. In Arctic Geology and Geophysics (eds Embry, AF and Balkwill, HR), pp. 267–78. Canadian Society of Petroleum Geologists, Calgary, Memoir no. 8.Google Scholar
Starkey, NA, Fitton, JG, Stuart, FM and Larsen, LM (2012) Melt inclusions in olivines from early Iceland plume picrites support high 3He/4He in both enriched and depleted mantle. Chemical Geology 306–307, 54–62, doi: 10.1016/j.chemgeo.2012.02.022.CrossRefGoogle Scholar
Starkey, NA, Stuart, FM, Ellam, RM, Fitton, JG, Basu, S and Larsen, LM (2009) Helium isotopes in early Iceland plume picrites: Constraints on the composition of high 3He/4He mantle. Earth and Planetary Science Letters 277, 91–100, doi: 10.1016/j.epsl.2008.10.007.CrossRefGoogle Scholar
Suckro, S, Gohl, K, Funck, T, Heyde, I, Ehrhardt, A, Schreckenberger, B, Gerlings, J, Damm, V and Jokat, W (2012) The crustal structure of southern Baffin Bay: implications from a seismic refraction experiment. Geophysical Journal International 190, 37–58, doi: 10.1111/j.1365-246X.2012.05477.x.CrossRefGoogle Scholar
Suckro, S, Gohl, K, Funck, T, Heyde, I, Schreckenberger, B, Gerlings, J and Damm, V (2013) The Davis Strait crust – a transform margin between two oceanic basins. Geophysical Journal International 193, 78–97, doi: 10.1093/gji/ggs126.CrossRefGoogle Scholar
Tappe, S, Foley, SF, Stracke, A, Romer, RL, Kjarsgaard, BA, Heaman, LM and 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, doi: 10.1016/j.epsl.2007.01.036.CrossRefGoogle Scholar
Turner, SP, Platt, JP, George, RMM, Kelly, SP, Pearson, DG and Nowell, GM (1999) Magmatism associated with orogenic collapse of the Betic–Alboran domain, SE Spain. Journal of Petrology 40, 1011–36.CrossRefGoogle Scholar
Umpleby, DC (1979) Geology of the Labrador Shelf. Geological Survey of Canada Paper 79–13, 34 pp.Google Scholar
Wanless, VD, Behn, MD, Shaw, AM and Plank, T (2014) Variations in melting dynamics and mantle compositions along the Eastern Volcanic Zone of the Gakkel Ridge: insights from olivine-hosted melt inclusions. Contributions to Mineralogy and Petrology 167, 22 pp., doi: 10.1007/s00410-014-1005-7.CrossRefGoogle Scholar
Whittaker, RC (1996) A preliminary seismic interpretation of an area with extensive Tertiary basalts offshore central West Greenland. Bulletin Grønlands Geologiske Undersøgelse 172, 28–31.Google Scholar
Willhite, LN, Jackson, MG, Blichert-Toft, J, Bindeman, I, Kurz, MD, Halldórsson, SA, Hardardottir, S, Gazel, E, Price, A and Byerly, BL (2019) Hot and heterogeneous high-3He/4He components: new constraints from Proto-Iceland plume lavas from Baffin Island. Geochemistry, Geophysics, Geosystems 20, 29 pp, doi: 10.1029/2019GC008654.CrossRefGoogle Scholar
Supplementary material: File

Larsen and Williamson supplementary material

Larsen and Williamson supplementary material

Download Larsen and Williamson supplementary material(File)
File 116.7 KB