Advertisement

Contributions to Mineralogy and Petrology

, Volume 104, Issue 3, pp 277–293 | Cite as

Magmatic evolution of the Karmøy Ophiolite Complex, SW Norway: relationships between MORB-IAT-boninitic-calc-alkaline and alkaline magmatism

  • Rolf B. Pedersen
  • Jan Hertogen
Article

Abstract

The polyphasal magmatic evolution of the Caledonian Karmøy Ophiolite Complex includes: (1) formation of an axis sequence from island-arc tholeiitic (IAT) and more MORB-like magmas (493+7/-4 Ma); (2) intrusion of magmas of boninitic affinity (485±2 Ma); (3) intrusion of MORB- and IAT-like magmas; (4) intrusion and extrusion of calc-alkaline magmas (470+9/-5 Ma); (5) intrusion and extrusion of basalts with alkaline trace-element affinity. Repeated intrusion of MORB and IAT-like magmas may be explained by intermittent magmatism involving magma-chamber solidification and remelting of a source characterized by initial ɛNd of approximately +6.5. The boninitic rocks may have formed from two LREE-depleted sources: the primary source of the axis-sequence magmas and the residual source left after extraction of these magmas. These sources have been enriched in LREE, Th and Zr from subducted material exhibiting a continental Nd-isotope signature with initial ɛNd less than-8. Covariation between ɛNd and Th, Zr, Nd, Y and Yb may be explained by metasomatic enrichment of a LREE-depleted mantle source by a LREE-enriched subduction component, followed by partial melting during which the degree of melting of the metasomatized mantle source increased linearly with the amount of subduction component added to the mantle source. The calc-alkaline magmas may have formed by remelting of a highly depleted source, which became enriched in some trace elements derived from the source of the subsequent alkaline magmatism. The geology and geochemistry of the Karmøy Ophiolite Complex suggest growth of an island-arc upon newly-formed oceanic crust, followed by arc-splitting and the development of a new basin.

Keywords

Geochemistry Subduction Partial Melting Oceanic Crust Mantle Source 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Alderton DHM, Pearce JA, Potts PJ (1980) Rate earth element mobility during granite alteration: evidence from southwest England. Earth Planet Sci Lett 49:149–165Google Scholar
  2. Beccaluva L, Serri G (1988) Boninitic and low-Ti subduction-related lavas from intraoceanic arc-backarc systems and low-Ti ophiolites: a reappraisal of their petrogenesis and original tectonic setting. Tectonophysics 146:291–315Google Scholar
  3. Bluck BJ, Halliday AN, Aftalion M, Macintyre RM (1980) Age and origin of Ballantrae ophiolite and its significance to the Caledonian orogeny and Ordovician time scale. Geology 8:492–495Google Scholar
  4. Briqueue L, Bougault H, Joron JL (1984) Quantification of Nb, Ta, Ti and V anomalies in magmas associated with subduction zones: petrogenetic implications. Earth Planet Sci Lett 68:297–308Google Scholar
  5. Cameron WE, McCulloch MT, Walker DA (1983) Boninite petrogenesis: chemical and Nd−Sr isotopic constraints. Earth Planet Sci Lett 65:75–89Google Scholar
  6. Carey S, Sigurdsson H (1984) A model of volcanogenic sedimentation in marginal basins. In: Kokelaar BP, Howells MF (eds) Marginal Basin Geology. Geol Soc London Spec Publ 16:37–58Google Scholar
  7. Chester R, Griffiths AG, Hirst JM (1979) The influence of soil-sized atmospheric particulates on the elemental chemistry of deep-sea sediments in the northeastern Atlantic. Mar Geol 32:141–154Google Scholar
  8. Coish RA, Hickey R, Frey FA (1982) Rare earth element geochemistry of the Betts Cove ophiolite, Newfoundland: complexities in ophiolite formation. Geochim Cosmochim Acta 46:2117–2134Google Scholar
  9. Crawford AJ, Beccaluva L, Serri G (1981) Tectono-magmatic evolution of the west Philippine-Mariana region and the origin of boninites. Earth Planet Sci Lett 54:346–356Google Scholar
  10. Dixon TH, Batiza R (1979) Petrology and chemistry of recent lavas in the northern Marianas: implications for the origin of island arc basalts. Contrib Mineral Petrol 70:167–182Google Scholar
  11. Dunning GR, Chorlton LB (1985) The Annieopsquotch ophiolite belt of southwest Newfoundland: geology and tectonic significance. Geol Soc Am Bull 96:1466–1476Google Scholar
  12. Dunning GR, Krogh TE (1986) Geochronology of ophiolites of the Newfoundland Appalachians. Can J Earth Sci 22:1659–1670Google Scholar
  13. Dunning GR, Pedersen RB (1988) U/Pb ages of ophiolites and arc-related plutons of the Norwegian Caledonides: Implications for the development of Iapetus. Contrib Mineral Petrol 98:13–23Google Scholar
  14. Flanagan FJ (1973) 1972-values for international geochemical reference standards. Geochim Cosmochim Acta 37:1189Google Scholar
  15. Furnes H, Pedersen RB, Stillman CJ (1988) The Leka Ophiolite Complex, central Norwegian Calcdonides: field characteristics and geotectonic significance. Geol Soc London 145:401–412Google Scholar
  16. Furnes H, Sturt BA, Griffin WL (1980) Trace element geochemistry of metabasalts from the Karmøy Ophiolite, southest Norwegian Caledonides. Earth Planet Sci Lett 50:75–91Google Scholar
  17. Gill JB (1976) Composition and age of Lau Basin and Ridge volcanic rocks: Implications for evolution of an interarc basin and remnant arc. Geol Soc Am Bull 87:1384–1395Google Scholar
  18. Goldstein SL, O'Nions RK, Hamilton PJ (1984) A Sm−Nd isotopic study of atmospheric dusts and particulates from major river systems. Earth Planet Sci Lett 70:221–236Google Scholar
  19. Gorton MP (1977) The geochemistry and origin of quaternary volcanism in the New Hebrides. Geochim Cosmochim Acta 41:1257–1270Google Scholar
  20. Govindaraju K (1984) 1984 compilation of working values and sample description for 170 international reference samples of mainly silicate rocks and minerals. Geostandards Newsletter, vol 8, Special July IssueGoogle Scholar
  21. Green DH (1973) Experimental melting studies on a model upper mantle composition at high pressure under water-saturated and water-undersaturated conditions. Earth Planet Sci Lett 19:37–53Google Scholar
  22. Green TH (1980) Island arc and continent building magmatism — a review of petrogenetic models based on experimental petrology and geochemistry. Tectonophysics 63:367–385Google Scholar
  23. Hart RA (1970) Chemical exchange between sea water and deep ocean basalts. Earth Planet Sci Lett 9:269–279Google Scholar
  24. Hart SR, Erlank AJ, Kable EJD (1974) Sea floor basalt alteration; some chemical and Sr isotopic effects. Contrib Mineral Petrol 44:219–230Google Scholar
  25. Henderson P (1982) Inorganic geochemistry. Pergamon, Oxford New York, p 71Google Scholar
  26. Hertogen J, Gijbels R (1971) Instrumental neutron activation analyses of rock using a low-energy photon detector. Anal Chemica Acta 56:61–82Google Scholar
  27. Hertogen J, Sachtleben T, Schmincke H, Jenner G (1985) Trace element geochemistry and petrogenesis of basalts from Deep Sea Drilling Project Sites 556–559 and 561–564. In: Boupandt H, Cande SC, et al. (eds) Init Repts Deep Sea Drill Proj 82:449–457. US Goverment Printing Office, Washington DCGoogle Scholar
  28. Hickey RL, Frey FA (1982) Geochemical characteristics of boninite series volcanics: implications for their source. Geochim Cosmochim Acta 46:2099–2115Google Scholar
  29. Hickey-Vargas R, Reagan MK (1987) Temporal variation of isotope and rare earth element abundances in volcanic rocks from Guam: implications for the evolution of the Mariana Arc. Contrib Mineral Petrol 97:497–508Google Scholar
  30. Hilde TWC, Lee CS (1984) Origin and evolution of the West Philippine Basin: a new interpretation. Tectonophysics 102:85–104Google Scholar
  31. Hilde TWC, Uyeda S, Kroenke L (1977) Evolution of western Pacific and its margin. Tectonophysics 38:145–165Google Scholar
  32. Hooker PJ, Hamilton PJ, O'Nions RK (1981) An estimate of the Nd isotopic composition of Iapetus seawater from ca. 490 Ma metalliferous sediments. Earth Planet Sci Lett 56:180–188Google Scholar
  33. Hughes DJ, Brown GC (1972) Basalts from Madeira: a petrological contribution to the genesis of oceanic alkali rock series. Contrib Mineral Petrol 37:91–109Google Scholar
  34. Humphris SE, Thompson G (1978) Trace element mobility during hydrothermal alteration of oceanic basalts. Geochim Cosmochim Acta 42:127–136Google Scholar
  35. Jacobsen SB, Wasserburg GJ (1979) Nd and Sr isotopic study of the Bay of Islands ophiolite complex and the evolution of the source of mid-ocean ridge basalts. J Geophys Res 84:7429–7445Google Scholar
  36. Jacobsen SB, Wasserburg GJ (1984) Sm−Nd isotpic evolution of chondrites and achondrites, II. Earth Planet Sci Lett 67:137–150Google Scholar
  37. Jagoutz E, Palme H, Baddenhausen H, Blum K, Cendales M, Dreibus G, Spettel B, Lorenz V, Wänke H (1979) The abundances of major, minor and trace elements in the earth's mantle as derived from primitive ultramafic nodules. In: Proc Lunar Planet Sci Conf 10th, pp 2031–2050Google Scholar
  38. Jenner GA (1981) Geochemistry of high-Mg andesites from Cape Vogel, Papua New Guinea. Chem Geol 33:307–332Google Scholar
  39. Jenner GA, Longerich HP, Jackson SE, Fryer BJ (1990) ICP-MS — a powerful new tool for high precision trace element analysis in earth sciences: evidence from analysis of selected USGS standards. Chem Geol (in press)Google Scholar
  40. Koritnig S (1972) Fluorine. In: Wedepohl KH (ed) Handbook of geochemistry, II-1. Springer, Berlin Heidelberg New YorkGoogle Scholar
  41. Langmhyr FJ, Paus PE (1968) The analysis of inorganic siliceous materials by atomic absorption spectrophotometry and the hydrofluoric acid decomposition technique. Pt.1. The analyses of silicate rocks. Anal Chim Acta 43:397–408Google Scholar
  42. Langmuir CH, Bender JF, Bence AE, Hanson GN, Taylor SR (1977) Petrogenesis of basalts from the FAMOUS area: mid-Atlantic ridge. Earth Planet Sci Lett 36:133Google Scholar
  43. Laurent R (1960) Environment of formation, evolution and emplacement of the Appalachian ophiolites from Quebec. Prot Int Ophiolite Symp, Cyprus 1979, pp 628–636Google Scholar
  44. Ledru P (1978) Le complex plutonique de West Karmøy: un example de mise en place par intrusions successives. CRG Réunion Ann Sci Terre 240Google Scholar
  45. Marsh NG, Saunders AD, Tarney J, Dick HJB (1980) Geochemistry of basalts from the Shikoku and Daito Basins, Deep Sea Drilling Project Leg 58. In: DeVries Klein G, Kobayashi K, et al. (eds) Init Rep Deep Sea Drill Proj 58:805–842. US Goverment Printing Office, Washington DCGoogle Scholar
  46. McKenzie D (1985a) 230Th-238U disequilibrium and the melting processes beneath ridge axes. Earth Planet Sci Lett 72:149–157Google Scholar
  47. McKenzie D (1985b) The extraction of magma from the crust and mantle. Earth Planet Sci Lett 74:81–91Google Scholar
  48. Mearns EW (1986) Sm−Nd ages for Norwegian garnet peridotite. Lithos 19:269–278Google Scholar
  49. Meijer A (1983) The origin of Low-K rhyolites from the Mariana frontal arc. Contrib Mineral Petrol 83:45–51Google Scholar
  50. Meijer A (1980) Primitive arc volcanism and a boninite series: Example from western Pacific island arcs. In: Hayes DE (ed) The tectonic evolution of southeast asian seas and islands. Am Geophys Union Monogr 23:269–282Google Scholar
  51. Molnar P, Atwater T (1978) Interarc spreading and Cordilleran tectonics as alternates related to the age of subducted oceanic lithosphere. Earth Planet Sci Lett 41:330–340Google Scholar
  52. Pearce JA, Norry MJ (1979) Petrogenetic implications of Ti, Zr, Y and Nb variations in volcanic rocks. Contrib Mineral Petrol 69:33–47Google Scholar
  53. Pearce JA (1980) Geochemical evidence for the genesis and eruptive setting of lavas from Tethyen ophiolites. Proc Int Ophiolite Symp, Cyprus 1979, pp 261–272Google Scholar
  54. Pearce JA (1982) Trace element characteristics of lavas from destructive plate boundaries. In: Thorpe RS (ed) Andesites. Wiley, New York, pp 525–548Google Scholar
  55. Pearce JA, Lippard SJ, Roberts S (1984) Characteristics and tectonic significance of supra-subduction zone ophiolites. In: Kokelaar BP, Howells MF (eds) Marginal basin geology. Geol Soc London Spec Publ 16:77–94Google Scholar
  56. Pedersen RB, Malpas J (1984) The origin of oceanic plagiogranites from the Karmøy ophiolite, Western Norway. Contrib Mineral Petrol 88:36–52Google Scholar
  57. Pedersen RB (1986) The nature and significance of magma chamber margins in ophiolites: examples from the Norwegian Caledonides. Earth Planet Sci Lett 77:100–112Google Scholar
  58. Pedersen RB, Furnes H, Dunning GR (1988) Some Norwegian ophiolite complexes reconsidered: progress in studies of the lithosphere in Norway. Nor Geol Unders Spec Publ 3:80–85Google Scholar
  59. Rautenschlein M, Jenner GA, Hertogen J, Hofmann AW, Kerrich R, Schmincke HU, White WM (1985) Isotopic and trace element composition of volcanic glasses from the Akaki Canyon, Cyprus: implication for the origin of the Troodos ophiolite. Earth Planet Sci Lett 75:369–383Google Scholar
  60. Reagan M, Meijer A (1983) Geology and geochemistry of early arc volcanic rocks from Guam. Bull Geol Soc Am 95:701–713Google Scholar
  61. Richard P, Shimizu N, Allegre CJ (1976) 143Nd/146Nd, a natural tracer: an application to oceanic basalts. Earth Planet Sci Lett 31:269–278Google Scholar
  62. Rogers NW, MacLoad Cj, Murton BJ (1989) Petrogenesis of boninitic lavas from Limassol Forest Complex Cyprus. In: Crawford A (ed) Boninites. Unwin Hyman, Londnon, pp 288–313Google Scholar
  63. Saunders AD, Tarney J, Weaver SD (1980) Transverse geochemical variations across the Antartic peninsula: implications for the genesis of calc-alkaline magmas. Earth Planet Sci Lett 46:344–360Google Scholar
  64. Saunders AD, Tarney J (1984) Geochemical characteristics of basaltic volcanism within back-arc basins. In: Kokelaar BP, Howells MF (eds) Marginal basin geology. Geol Soc London Spec Publ 16:59–76Google Scholar
  65. Sharaskin AY, Dobretsov NL (1979) Marianites: the clinoenstatite-bearing pillow lavas associated with ophiolites of Mariana Island arc. Proc Int Ophiolite Symp, Cyprus 1979, pp 71–72Google Scholar
  66. Shaw DM (1970) Trace element fractionation during anatexis. Geochim Cosmochim Acta 34:237Google Scholar
  67. Shaw HF, Chen JH, Saleeby JB, Wasserburg GJ (1987) Nd−Sr−Pb systematics and age of the Kings River ophiolite, California: implications for depleted mantle volution. Contrib Mineral Petrol 96:281–290Google Scholar
  68. Solli T (1981) The goelogy of the Torvastad Group, the cap rocks to the Karmøy ophiolite. Unpublished Cand Real thesis, University of Bergen, pp 272Google Scholar
  69. Sturt BA, Thon A (1972) A major early Caledonian igneous complex and a profound unconformity in the Lower Palaeozoic sequence of Karmøy, southwest Norway. Norsk Geol Tidsskr 58:221–228Google Scholar
  70. Sturt BA, Thon A, Furnes H (1979) The Karmøy ophiolite, southwest Norway. Geology 7:316–320Google Scholar
  71. Suen CJ, Frey FA, Malpas J (1979) Bay of Islands ophiolite suite, Newfoundland: petrologic and geochemical characteristics with emphasis on rare earth element geochemistry. Earth Planet Sci Lett 45:337–348Google Scholar
  72. Sun S-S (1980) Lead isotope study of young volcanic rocks from mid-ocean ridges, ocean island and island arcs. Philos Trans R Soc London Ser A 297:409–455Google Scholar
  73. Taylor RP, Fryer BJ (1982) Rare earth geochemistry as an aid to intepreting hydrothermal ore deposits. In: Evans A (ed) Metallization associated with acid magmatism. Wiley, Chichester, pp 357–365Google Scholar
  74. Tarney J, Saunders AD, Mattey DP, Wood DA, Marsh NG (1981) Geochemical aspects of back-arc spreading in the Scotia Sea and Western Pacific. Phil Trans R Soc London A 300:263–285Google Scholar
  75. Thompson G (1973) Trace element distribution in fractionated oceanic rocks, 2. gabbros and related rocks. Chem Geol 12:99–111Google Scholar
  76. Van der Laan SR, Flower MFJ, Koster van Groos AF (1989) Experimental evidence for the origin of boninites: near-liquidus phase relations to 7.5 kbar. In: Crawford AJ (ed) Boninites. Unwin Hyman, LondonGoogle Scholar
  77. White WM, Schilling JG (1978) Nature and origin of geochemical variation in Mid-Atlantic Ridge basalts from Central North-Atlantic. Geochim Cosmochim Acta 42:1501–1516Google Scholar
  78. Wood DA, Mattey DP, Joron JL, et al. (1980) A geochemical study of 17 selected samples from the basement cores recovered at sites 447, 448, 449, 450, and 451 DSDP Leg 59. In: Kroenke L, Scott R, et al. (eds) Init Rep Deep Sea Drill Proj 59. US Goverment Printing Office, Washington DCGoogle Scholar
  79. Wood DA, Marsh NG, Tarney J, Joron J-L, Fryer P, Treuil M (1982) Geochemistry of igneous rocks recovered from a transect across the Mariana trough, arc, forearc and trench, sites 453 through 461. In: Lee M, Powell R (eds) Init Rep Deep Sea Drill Proj 60:611–45, US Goverment Printing Office, Washinton DCGoogle Scholar

Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Rolf B. Pedersen
    • 1
  • Jan Hertogen
    • 2
  1. 1.Institute of GeologyUniversity of BergenBergenNorway
  2. 2.Department of Physicochemical GeologyUniversity of LeuvenLeuvenBelgium

Personalised recommendations