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A Cambrian island arc in Iapetus: geochronology and geochemistry of the Lake Ambrose volcanic belt, Newfoundland Appalachians

Published online by Cambridge University Press:  01 May 2009

G. R. Dunning ,
H. S. Swinden ,
B. F. Kean ,
D. T. W. Evans  and
G. A. Jenner
G. R. Dunning
Affiliation:
Department of Earth Sciences, Memorial University of Newfoundland, St John's, Newfoundland A1B 3X5, Canada
H. S. Swinden
Affiliation:
Geological Survey Branch, Department of Mines and Energy, P.O. Box 8700, St John's, Newfoundland, Canada
B. F. Kean
Affiliation:
Mineral Resources Management Branch, Department of Mines and Energy, P.O. Box 8700, St John's, Newfoundland, Canada
D. T. W. Evans
Affiliation:
Geological Survey Branch, Department of Mines and Energy, P.O. Box 8700, St John's, Newfoundland, Canada
G. A. Jenner
Affiliation:
Department of Earth Sciences, Memorial University of Newfoundland, St John's, Newfoundland A1B 3X5, Canada
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Abstract

The Lake Ambrose volcanic belt (LAVB) outcrops as a 45 km long northeast-trending belt of mafic and felsic volcanic rocks along the eastern side of the Victoria Lake Group in south-central Newfoundland. It comprises roughly equal proportions of mafic pillow basalt and high silica rhyolite, locally interbedded with epiclastic turbidites. Volcanic rocks have been metamorphosed in the greenschist facies and are extensively carbonatized.

U-Pb (zircon) dates from rhyolite at two, widely separated localities give identical ages of 513 ± 2 Ma (Upper Cambrian), and this is interpreted as the eruptive age of the volcanic sequence. Primitive arc and low-K tholeiites can be recognized on the basis of major and trace element geochemistry, ranging from LREE-depleted to LREE-enriched. Geochemical variation between mafic volcanic types is interpreted predominantly to reflect contrasts in source characteristics and degree of partial melting; some variation within each geochemical type attributable to fractional crystallization can be recognized. Detailed examination of some samples indicates that the heavy REE and related elements have locally been mobile, probably as a result of carbonate complexing.

The LAVB is the oldest well-dated island arc sequence in Newfoundland, and perhaps in the Appalachian–Caledonian Orogen. Its age requires modification of widely held models for the tectonic history of central Newfoundland. It is older than the oldest known ophiolite, demonstrating that arc volcanism was extant before the generation of the oldest known oceanic crust in this part of Iapetus. It further demonstrates that there was a maximum of approximately 30 Ma between the rift-drift transition which initiated Iapetus, and the initiation of subduction. This suggests that the oceanic sequences preserved in Newfoundland represent a series of arcs and back arc basins marginal to the main Iapetus Ocean, and brings into question whether the Appalachian accreted terranes contain any remnants of normal mid-ocean ridge type Iapetan crust.

Type
Research Article
Information
Geological Magazine , Volume 128 , Issue 1 , January 1991 , pp. 1 - 17
Copyright
Copyright © Cambridge University Press 1991

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References

Alt, J. C. & Emmermann, R. 1985. Geochemistry of hydrothermally altered basalts: Deep Sea Drilling Project Hole 504B, Leg 83. Initial Reports, Deep Sea Drilling Project 83, 249–62.Google Scholar
Arculus, R. J. 1987. The significance of source versus process in the tectonic controls of magma genesis. Journal of Volcanology and Geothermal Research 32, 1–12.CrossRefGoogle Scholar
Arculus, R. J. & Powell, R. 1986. Source component mixing in the regions of arc magma generation. Journal of Geophysical Research 91, 5913–26.CrossRefGoogle Scholar
Arndt, N. & Jenner, G. A. 1986. Crustally contaminated komatiites and basalts from Kambalda, Western Australia. Chemical Geology 56, 229–56.CrossRefGoogle Scholar
Bell, K. & Blenkinsop, J. 1981. A geochronological study of the Buchans area, Newfoundland. In The Buchans Orebodies: Fifty Years of Mining and Geology (eds Swanson, E. A., Strong, D. F. and Thurlow, J. G.), pp. 91–112. Geological Association of Canada, Special Paper 22.Google Scholar
Bienvenu, P., Bougault, H., Joron, J.-L., Treuil, M. & Dmitriev, L. 1985. MORB alteration: rare-earth element/non-rare-earth hygromagmatophile element fractionation. Chemical Geology 82, 1–14.CrossRefGoogle Scholar
Bird, J. M. & Dewey, J. F. 1970. Lithosphere plates – continental marginal tectonics and the evolution of the Appalachian Orogen. Geological Society of America, Bulletin 81, 1031–60.CrossRefGoogle Scholar
Bostock, H. H., Currie, K. L. & Wanless, R. K. 1979. The age of the Robert's Arm Group, north-central Newfoundland. Canadian Journal of Earth Sciences 16, 599–606.CrossRefGoogle Scholar
Briqueau, L., Bougault, H. & Joron, J.-L. 1984. Quantification of Nb, Ta, Ti and V anomalies in magmas associated with subduction zones: petrogenetic implications. Earth and Planetary Science Letters 68, 297–308.CrossRefGoogle Scholar
Coish, R. A. 1977. Ocean floor metamorphism in the Betts cove ophiolite, Newfoundland. Contributions to Mineralogy and Petrology 60, 255–70.CrossRefGoogle Scholar
Coish, R. A., Hickey, R. & Frey, F. A. 1982. Rare earth element geochemistry of the Betts Cove ophiolite, Newfoundland: complexities in ophiolite formation. Geochimica et Cosmochimica Acta 46, 2117–34.CrossRefGoogle Scholar
Davis, D. W. 1982. Optimum linear regression and error estimation applied to U-Pb data. Canadian Journal of Earth Sciences 19, 2141–9.CrossRefGoogle Scholar
Dean, P. L. 1978. The volcanogenic stratigraphy and metallogeny of Notre Dame Bay, Newfoundland. Memorial University of Newfoundland, Geology Report 7.Google Scholar
Dunning, G. R. 1986. Precise U-Pb zircon geochronology applied to Newfoundland ophiolites, granitoid and felsic volcanic rocks (abstr.). Geological Association of Canada, Newfoundland Section, Annual Spring Meeting, Program with Abstracts, 11–12.Google Scholar
Dunning, G. R., Barr, S. M., Raeside, R. P. & Jamieson, R. A. 1990. U-Pb zircon, titanite and monazite ages in the Bras d' Or and Aspy terranes of Cape Breton Island, Nova Scotia: Implications for igneous and metamorphic history. Geological Society of America Bulletin 102, 322–30.2.3.CO;2>CrossRefGoogle Scholar
Dunning, G. R., Kean, B. F., Thurlow, J. G. & Swinden, H. S. 1987. Geochronology of the Buchans, Roberts Arm and Victoria Lake Groups and the Mansfield Cove Complex, Newfoundland. Canadian Journal of Earth Sciences 24, 1175–84.CrossRefGoogle Scholar
Dunning, G. R. & Krogh, T. E. 1985. Geochronology of ophiolites of the Newfoundland Appalachians. Canadian Journal of Earth Sciences 22, 1659–70.CrossRefGoogle Scholar
Dunning, G. R. & Krogh, T. E. 1986. Geochronology of ophiolites of the Newfoundland Appalachians: Reply. Canadian Journal of Earth Sciences 23, 1862–4.CrossRefGoogle Scholar
Dunning, G. R., O'Brien, S. J., Colman-Sadd, S. P., Blackwood, R. F., Dickson, W. L., O'neill, P. P. & Krogh, T. E. in press. Silurian Orogeny in the Newfoundland Appalachians. Journal of Geology.Google Scholar
Elliot, C. G., Dunning, G. R. & Williams, P. F. in press. New constraints on the timing of deformation in eastern Notre Dame Bay, Newfoundland, from U/Pb zircon ages of felsic intrusions. Geological Society of America, Bulletin.Google Scholar
Evans, D. T. W., Kean, B. F. & Dunning, G. R. 1990. Geological studies, Victoria Lake Group, central Newfoundland. In Current Research, Newfoundland Department of Mines and Energy, Geological Survey Branch, Report 90–1, 131–44.Google Scholar
Ewart, A. 1979. A review of the mineralogy and chemistry of the Tertiary–Recent dacitic, latitic, rhyolitic and related sialic volcanic rocks. Trondhjemites, Dacites and Related Rocks (ed. Barker, F.), pp. 13–121. New York: Elsevier.CrossRefGoogle Scholar
Furnes, H., Austrheim, H., Amaliksen, K. G. & Nordas, J. 1983. Evidence for an incipient early Caledonian (Cambrian) orogenic phase in southwestern Norway. Geological Magazine 120, 607–12.CrossRefGoogle Scholar
Gill, J. B. 1981. Orogenic Andesites and Plate Tectonics. Heidelberg: Springerxy-Verlag.CrossRefGoogle Scholar
Gill, J. B. & Stork, A. L. 1979. Miocene low-K dacites and trondhjemites of Fiji. In Trondhjemites, Dacites and Related Rocks (ed. Barker, F.), pp. 629–49. New York: Elsevier.CrossRefGoogle Scholar
Harland, W. B. & Gayer, R. A. 1972. The Arctic Caledonides and earlier oceans. Geological Magazine 109, 289–314.CrossRefGoogle Scholar
Hellman, P. L., Smith, R. E. & Henderson, P. 1979. The mobility of the rare earth elements: evidence and implications from selected terrains affected by burial metamorphism. Contributions to Mineralogy and Petrology 71, 23–44.CrossRefGoogle Scholar
Hertogen, J., Sachtleben, T., Schminke, H.-U. & Jenner, G. A. 1985. Trace element geochemistry and petrogenesis of Leg 82 basalts. Initial Reports, Deep Sea Drilling Project 82, 449–57.Google Scholar
Humphris, S. E. & Thompson, G. 1978. Hydrothermal alteration of oceanic basalts by seawater. Geochimica et Cosmochimica Acta 42, 107–25.CrossRefGoogle Scholar
Jacobi, R. D. & Wasowski, J. J. 1985. Geochemistry and plate tectonic significance of the volcanic rocks of the Summerford Group, north-central Newfoundland. Geology 13, 126–30.2.0.CO;2>CrossRefGoogle Scholar
Jakes, P. & Gill, J. 1970. Rare earth elements and the island arc tholeiite series. Earth and Planetary Science Letters 9, 17–28.CrossRefGoogle Scholar
Jenner, G. A. & Fryer, B. J. 1980. Geochemistry of the upper Snooks Arm Group basalts, Burlington Peninsula, Newfoundland: evidence against formation in an island arc. Canadian Journal of Earth Sciences 17, 888–900.CrossRefGoogle Scholar
Jenner, G. A. & Swinden, H. S. 1989. Trace element and isotope geochemistry of the Pipestone Pond Complex, Newfoundland: complex magmatism in an eastern Dunnage Zone ophiolite (abstr.). Geological Association of Canada, Program with Abstracts 14, A96.Google Scholar
Jenner, G. A., Longerich, H. P., Jackson, S. E. & Fryer, B. J. 1990. ICP-MS – a powerful tool for high precision trace element analysis in earth sciences: evidence from analysis of selected USGS reference samples. Chemical Geology 83, 133–48.CrossRefGoogle Scholar
Kamo, S. L., Gower, C. F. & Krogh, T. E. 1989. Birthdate for the Iapetus Ocean? A precise U-Pb zircon and baddeleyuite age for the Long Range dikes, southeast Labrador. Geology 17, 602–5.2.3.CO;2>CrossRefGoogle Scholar
Kean, B. F. 1977. Geology of the Victoria Lake map area (12A/6), Newfoundland. Newfoundland Department of Mines and Energy, Mineral Development Division, Report 77–4.Google Scholar
Kean, B. F. 1983. Geology of the King George IV map area (12A/4). Newfoundland Department of Mines and Energy, Mineral Development Division, Report 83–4.Google Scholar
Kean, B. F. 1985. Metallogeny of the Tally Pond volcanics, Victoria Lake Group, central Newfoundland. Current Research. Newfoundland Department of Mines and Energy, Mineral Development Division, Report 85–1.Google Scholar
Kean, B. F. & Evans, D. T. W. 1988 a. Geology and mineral deposits of the Victoria Lake Group. In The Volcano-genie Sulphide Districts of Central Newfoundland (eds Swinden, H. S. and Kean, B. F.), pp. 144–56. Geological Association of Canada, Mineral Deposits Division, St John's, Newfoundland.Google Scholar
Kean, B. F. & Evans, D. T. W. 1988 b. Regional metallogeny of the Victoria Lake Group, central Newfoundland. In Current Research, Newfoundland Department of Mines and Energy, Mineral Development Division, Report 88–1, 319–30.Google Scholar
Kean, B. F., Dean, P. L. & Strong, D. F. 1981. Regional geology of the Central Volcanic Belt of Newfoundland. In The Buchans Orebodies: Fifty Years of Mining and Geology (eds. Swanson, E. A., Strong, D. F. and Thurlow, J. G.), pp. 65–78. Geological Association of Canada, Special Paper 22.Google Scholar
Kean, B. F. & Jayasinghe, N. R. 1980. Geology of the Lake Ambrose (12A/10) and Noel Parts Brook (12A/9) map areas, Newfoundland. Newfoundland Department of Mines and Energy, Mineral Development Division, Report 80–2.Google Scholar
Kean, B. F. & Jayasinghe, N. R. 1982. Geology of the Badger map area (12A/16), Newfoundland. Newfoundland Department of Mines and Energy, Mineral Development Division, Report 81–2.Google Scholar
Kelley, S. & Bluck, B. J. 1989. Detrital mineral ages from the Southern Uplands using 40Ar–39 Ar laser probe. Journal of the Geological Society, London 146, 401–3.CrossRefGoogle Scholar
Kerrich, R. & Fryer, B. J. 1979. Archean precious-metal hydrothermal systems, Dome Mine, Abitibi Greenstone Belt. II. REE and oxygen isotope relations. Canadian Journal of Earth Sciences 16, 440–58.CrossRefGoogle Scholar
Ludwig, K. R. 1980. Calculation of uncertainties of U-Pb isotope data. Earth and Planetary Science Letters 46, 212–20.CrossRefGoogle Scholar
Mackenzie, A. C. 1988. An overview of the geology and tectonic setting of the Boundary volcanogenic massive sulphide deposit, Tally Pond volcanics, central Newfoundland. In The Volcanogenic Sulphide Districts of Central Newfoundland (eds Swinden, H. S. and Kean, B. F.), pp. 157–64. Geological Association of Canada, Mineral Deposits Division, St John's, Newfoundland.Google Scholar
Mattinson, J. M. 1975. Early Paleozoic ophiolite complexes of Newfoundland: Isotopic ages of zircons. Geology 3, 181–3.2.0.CO;2>CrossRefGoogle Scholar
Merriman, R. J., Bevins, R. E. & Ball, T. K. 1986. Petrological and geological variations within the Tal y Fan intrusion: a study of element mobility during low grade metamorphism with implications for petrogenetic modeling. Journal of Petrology 27, 1409–36.CrossRefGoogle Scholar
Michard, A. & Albarede, F. 1986. The REE content of some hydrothermal fluids. Chemical Geology 55, 51–60.CrossRefGoogle Scholar
Miyashiro, A. 1974. Volcanic rocks series in island arcs and active continental margins. American Journal of Science 274, 321–55.CrossRefGoogle Scholar
Natland, J. H. & Tarney, J. 1981. Petrologic evolution of the Mariana arc and back-arc basin system – A synthesis of drilling results in the south Philippine Sea. Initial Reports, Deep Sea Drilling Project 60, 877–908.Google Scholar
Nowlan, G. S. & Thurlow, J. G. 1984. Middle Ordovician conodonts from the Buchans Group, central Newfoundland, and their significance for regional stratigraphy of the Central Volcanic Belt. Canadian Journal of Earth Sciences 21, 284–96.CrossRefGoogle Scholar
Pavlides, L. 1981. The central Virginia volcanic – plutonic belt: an island arc of Cambrian (?) age. U.S. Geological Survey, Professional Paper 1231-A.CrossRefGoogle Scholar
Payne, J. G. & Strong, D. F. 1979. Origin of the Twillingate trondhjemite, north-central Newfoundland: partial melting in the roots of an island arc. In Trondhjemites, Dacites and Related Rocks (ed. Barker, F.), pp. 489–516. Amsterdam: Elsevier.CrossRefGoogle Scholar
Pearce, J. A. 1975. Basalt geochemistry used to investigate past tectonic environments on Cyprus. Tectonophysics 25, 41–67.CrossRefGoogle Scholar
Pearce, J. A. 1987. An expert system for the tectonic characterization of ancient volcanic rocks. Journal of Volcanology and Geothermal Research 32, 51–65.CrossRefGoogle Scholar
Pearce, J. A. & Cann, J. R. 1973. Tectonic setting of basic volcanic rocks using trace element analysis. Earth and Planetary Science Letters 19, 290–300.CrossRefGoogle Scholar
Sanjuan, B., Michard, A. & Michard, G. 1988. Influence of the temperature of CO2-rich springs on their aluminium and rare-earth element contents. Chemical Geology 68, 57–67.CrossRefGoogle Scholar
Saunders, A. D., Marsh, N. G. & Wood, D. A. 1980. Ophiolites as ocean crust or marginal basin crust. In Ophiolites: Proceedings of the International Ophiolite Symposium (ed. Panayiotou, A.), pp. 193–204. Ministry of Agriculture and Natural Resources, Cyprus.Google Scholar
Scott, R. B., Kroenke, L. & Zakariadze, G. 1980. Evolution of the South Philippine Sea: Deep Sea Drilling Project Leg 59 results. Initial Reports, Deep Sea Drilling Project 59, 803–15.Google Scholar
Seyfried, W. E. & Bischoff, J. L. 1981. Experimental seawater–basalt interaction at 300 °C and 500 bars: chemical exchange, secondary mineral formation and implications for the transport of heavy metals. Geochimica et Cosmochimica Acta 45, 135–47.CrossRefGoogle Scholar
Shervais, J. W. 1982. Ti-V plots and the petrogenesis of modern and ophiolitic lavas. Earth and Planetary Science Letters 59, 101–18.CrossRefGoogle Scholar
Smith, I. E. M. & Johnson, R. W. 1981. Contrasting rhyolite suites in the late Cenozoic of Papua New Guinea. Journal of Geophysical Research 86, B10257–72.CrossRefGoogle Scholar
Spooner, E. T. C, Beckinsdale, R. D., England, P. C. & Senior, A. 1977. Hydration, 18O enrichment and oxidation during ocean floor hydrothermal metamorphism of ophiolitic metabasic rocks from E. Ligura, Italy. Geochimica et Cosmochimica Acta 41, 857–71.CrossRefGoogle Scholar
Squires, G. C, Mackenzie, A. C. & Macinnis, D. 1990. Geology and genesis of the Duck Pond massive sulphide deposit. International Association for the Genesis of Ore Deposits, Field Excursion 1, Geological Survey of Canada, Open File.CrossRefGoogle Scholar
Stacey, J. S. & Kramers, J. D. 1975. Approximation of terrestrial lead isotope evolution by a two-stage model. Earth and Planetary Science Letters 26, 207–21.CrossRefGoogle Scholar
Stukas, V. & Reynolds, P. H. 1974. 40Ar/39 Ar dating of the Long Range Dykes, Newfoundland. Earth and Planetary Science Letters 22, 256–66.CrossRefGoogle Scholar
Sturchio, N. C, Muehlenbachs, K. & Seitz, M. G. 1986. Element redistribution during hydrothermal alteration of rhyolite in an active geothermal system: Yellowstone drill cores Y-7 and Y-8. Geochimica et Cosmochimica Acta 50, 1619–31.CrossRefGoogle Scholar
Sun, S.-S. 1980. Lead isotope study of young volcanic rocks from mid ocean ridges, ocean islands and island arcs. Philosophical Transactions of the Royal Society of London A297, 409–45.Google Scholar
Swinden, H. S. 1990. Geology and metallogeny of central Newfoundland. International Association for the Genesis of Ore Deposits, Field Excursion 1, Geological Survey of Canada, Open File.CrossRefGoogle Scholar
Swinden, H. S. & Thorpe, R. I. 1984. Variations in style of volcanism and massive sulphide deposition in island arc sequences of the Newfoundland central Mobile Belt. Economic Geology 79, 1596–1619.CrossRefGoogle Scholar
Swinden, H. S., Kean, B. F. & Dunning, G. D. 1988. Geological and paleotectonic setting of volcanogenic sulphide mineralization in central Newfoundland. In The Volcanogenic Sulphide Districts of Central Newfoundland (eds Swinden, H. S. and Kean, B. F.), pp. 5–26. Geological Association of Canada, Mineral Deposits Division, St John's, Newfoundland.Google Scholar
Swinden, H. S., Lehuray, A. P. & Slack, J. F. 1988. Lead isotopes in volcanogenic sulphides of the northern Appalachians: Applications to the correlation of Paleozoic terranes (abstr). Geological Association of Canada, Program with Abstracts 13, A121.Google Scholar
Swinden, H. S., Jenner, G. A., Kean, B. F. & Evans, D. T. W. 1989 a. Volcanic rock geochemistry as a guide for massive sulphide exploration in central Newfoundland. Current Research, Newfoundland Department of Mines, Geological Survey Branch, Report 89–1, 201–19.Google Scholar
Swinden, H. S., Jenner, G. A., Kean, B. F. & Evans, D. T. W. 1989 6. The significance of refractory source melting in volcanogenic sulphide mineralization: examples from central Newfoundland (abstr.). Geological Association of Canada, Program with Abstracts 13, A22.Google Scholar
Swinden, H. S., Jenner, G. A., Fryer, B. J., Hertogen, J. & Roddick, J. C. 1990. Petrogenesis and paleotectonic history of the Wild Bight Group, an Ordovician rifted island arc in Central Newfoundland. Contributions to Mineralogy and Petrology 105, 219–41.CrossRefGoogle Scholar
Vallier, T. L., Stevenson, A. J. & Scholl, D. W. 1985. Petrology of igneous rocks from Ata Island, Kingdom of Tonga. In Geology and offshore resources of Pacific island arcs – Tonga region (eds and compilers Scholl, D. W. and Vallier, T. L.), pp. 301–16. Circum Pacific Council for Energy and Mineral Resources Earth Sciences Series, volume 2. Houston, Texas: Circum Pacific Council for Energy and Mineral Resources.Google Scholar
Vallier, T., Jenner, G. A., Gill, J., Frey, F., Hawkins, J., Cawood, P., Morton, J., Scholl, D., Herzer, R., White, W. M., Rautenschlein, M., Volpe, A., White, L., Williams, R. & Stevenson, A. 1990. Petrogenesis of andesite from Valu Fa Ridge, Lau Basin: subduction zone effects in rocks from a back-arc spreading ridge. Chemical Geology, in press.Google Scholar
Wagenbauer, H. A., Riley, C. A. & Dawe, G. 1983. Geochemical Laboratory. Current Research, Newfoundland Department of Mines and Energy, Mineral Development Division, Report 83–1, 133–7.Google Scholar
Watson, E. B. & Ryerson, F. J. 1986. Rutile saturation in magmas: implications for Nb-Ti-Ta depletion in orogenic mamas. EOS 67, 409–19.Google Scholar
Williams, H. 1978. Tectonic lithofacies map of the Appalachian Orogen. Memorial University of Newfoundland, Map 1.Google Scholar
Williams, H., Gillespie, R. T. & Van Breeman, O. 1985. A late Precambrian rift-related igneous suite in western Newfoundland. Canadian Journal of Earth Sciences 22, 1727–35.CrossRefGoogle Scholar
Williams, H. & Hiscott, R. N. 1987. Definition of the Iapetus rift–drift transition in western Newfoundland. Geology 15, 1044–7.2.0.CO;2>CrossRefGoogle Scholar
Williams, H., Colman-Sadd, S. P. & Swinden, H. S. 1988. Tectonic-stratigraphic subdivisions of Central Newfoundland. In Current Research, Part B. Geological Survey of Canada, Paper 88–1B, 91–8.Google Scholar
Williams, S. H. 1988. Middle Ordovician graptolites from central Newfoundland. Current Research, Newfoundland Department of Mines, Mineral Development Division, Report 88–1, 183–8.Google Scholar
Wilson, J. T. 1966. Did the Atlantic close and then reopen? Nature 211, 676–81.CrossRefGoogle Scholar
Winchester, J. A. & Floyd, P. A. 1977. Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chemical Geology 20, 325–43.CrossRefGoogle Scholar
Wood, D. A. 1979. A variably veined suboceanic upper mantle – genetic significance for mid-ocean ridge basalts from geochemical evidence. Geology 7,499–503.2.0.CO;2>CrossRefGoogle Scholar
Wood, D. A., Joron, J. L. & Treuil, M. 1979. A reappraisal of the use of trace elements to classify and discriminate between magma series erupted in different tectonic settings. Earth and Planetary Science Letters 50, 326–36.CrossRefGoogle Scholar