Abstract
Subduction related basalts display wide ranges in large ion lithophile element ratios (e.g., Rb/Ba and Rb/ Sr) which are unlikely to result from mixing, but suggest a role for small degree partial melting of a relatively Rb-poor mantle wedge source. However, these variations do not correlate with other trace element criteria, such as the depletions of high field strength elements (HFSE) and light rare earth elements (LREE) relative to the LILE, which characterise subduction related magmatism. Integration of radiogenic isotope and trace element data demonstrates that the elemental enrichment cannot be simply related to two component mixtures inferred from isotopic variations. Thus a minimum of three components is required to describe the geochemistry of subduction zone basalts. Two are subduction related: high Sr/Nd material is derived from the dehydration of subducted basaltic ocean crust, and a low Sr/Nd component is thought to be from subducted terrigenous sediment. The third component is in the mantle wedge, it is usually similar to the source of MORB, particularly in its isotopic composition. However, in some cases, notably continental areas, more enriched mantle wedge material with relatively high 87Sr/86Sr, low 143Nd/144Nd and elevated incompatible trace element contents may be involved Mixing of these three components is capable of producing both the entire range of Sr, Nd and Pb isotope signatures observed in destructive margin basalts, and their distinctive trace element compositions. The isotope differences between Atlantic and Pacific island arc basalts are attributed to the isotope compositions of sediments in the two oceans.
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References
Allegre CJ, Minster JF (1978) Quantitative models of trace element behaviour in magmatic processes. Earth Planet Sci Lett 38:1–25
Arculus RJ, Powell R (1986) Source component mixing in the regions of arc magma generation. J Geophys Res 91 (B6):5913–5926
Claque DA, Frey FA (1982) Petrology and trace element geochemistry of the Honolulu volcanics, Oahu: implications for the oceanic mantle beneath Hawaii. J Petrol 23:447–504
Cohen RS, O'Nions RK (1982) Identification of recycled continental material in the mantle from Sr, Nd and Pb isotopic investigations. Earth Planet Sci Lett 61:71–84
Davidson JP (1986) Isotopic and trace element constraints on the petrogenesis of subduction related lavas from Martinique, Lesser Antilles. J Geophys Res 91 (B6):5943–5962
DePaolo DJ, Johnson RW (1977) Magma genesis in the New Britain island arc: constraints from Sr and Nd isotopes and trace element patterns. Contrib Mineral Petrol 70:367–379
DePaolo DJ, Wasserburg GJ (1976) Inferences about mantle sources and mantle structure from variations of 143Nd/144Nd. Geophys Res Lett 3:743–743
DePaolo DJ, Wasserburg GJ (1977) The sources of island arcs as indicated by Nd and Sr isotope studies. Geophys Res Lett 4:465–468
Dupuy C, Dostal J, Marcelot G, Bougault H, Joron JL, Treil M (1982) Geochemistry of basalts from central and southern New Hebrides arc: implications for their source rock composition. Earth Planet Sci Lett 60:207–225
Elderfield H, Hawkesworth CJ, Greaves MJ (1981) Rare earth geochemistry of oceanic ferromanganese nodules and associated sediments. Geochim Cosmochim Acta 45:513–528
Ellam RM (1986) The transition from calcalkaline to potassic volcanism in the Aeolian Islands, Southern Italy. Ph D thesis, Open University, p 210
Ewart A, Hawkesworth CJ (1987) The Pleistocene-Recent Tonga-Kermadec arc lavas: interpretation of new isotopic and rare earth data in terms of a depleted mantle source model. J Petrol 28:495–530
Ewart A, Brothers RN, Mateen A (1977) An outline of the geology and geochemistry, and the possible petrogenetic evolution of the volcanic rocks of the Tonga-Kermadec-New Zealand island arc. J Volcanol Geotherm Res 2:205–250
Gill JB (1984) Sr-Pb-Nd isotopic evidence that both MORB and OIB sources contribute to oceanic island arc magmas in Fiji. Earth Planet Sci Lett 68:443–458
Goldstein SL, O'Nions RK (1981) Nd and Sr isotopic relationships in pelagic clays and ferromanganese deposits. Nature 292:324–327
Green TH (1981) Experimental evidence for the role of accessory phases in magma genesis. J Volcanol Geotherm Res 10:405–422
Hart SR (1984) A large-scale isotopic anomaly in the southern hemisphere mantle. Nature 309:752–757
Hawkesworth CJ, Elderfield H (1978) The strontium isotopic composition of interstitial waters from sites 245 and 336 of the deep sea drilling project. Earth Planet Sci Lett 40:423–432
Hawkesworth CJ, Powell M (1980) Magma genesis in the Lesser Antilles island arc. Earth Planet Sci Lett 51:297–308
Hawkesworth CJ, O'Nions RK, Pankhurst RJ, Hamilton PJ, Evenson NM (1977) A geochemical study of island arc and back arc tholeiites from the Scotia Sea. Earth Planet Sci Lett 36:253–263
Hawkesworth CJ, Norry MJ, Roddick JC, Baker PE, Francis PW, Thorpe RS (1979a) 143Nd/144Nd, 87Sr/86Sr and incompatible element variations in calcalkaline andesites and plateau lavas from South America. Earth Planet Sci Lett 42:45–57
Hawkesworth CJ, O'Nions RK, Arculus RJ (1979b) 143Nd/144Nd and 87Sr/86Sr geochemistry of the alkalic rock suite, Grenada, Lesser Antilles. Earth Planet Sci Lett 45:237–248
Hawkesworth CJ, Rogers NW, van Calsteren PWC, Menzies MA (1984) Mantle enrichment processes. Nature 311:331–335
Hawkesworth CJ, Fraser KJ, Rogers NW (1985) Kimberlites and lamproites: extreme products of mantle enrichment processes. Trans Geol Soc S Afr 88:439–448
Henderson P (1982) Inorganic geochemistry. Pergamon, Oxford, p 353
Hickey RL, Frey FA, Gerlach DC (1986) Multiple sources for basaltic rocks from the southern volcanic zone of the Andes (34°–41° S): trace element and isotopic evidence for contributions from subducted oceanic mantle and continental crust. J Geophys Res 91:5943–5962
Hofmann AW, White WM (1983) Ba, Rb and Cs in the earth's mantle. Z Naturforsch 38a:256–266
Hole MJ, Saunders AD, Marriner GF, Tarney J (1984) Subduction of pelagic sediments: implications for the origin of Ceanomalous basalts from the Mariana Islands. J Geol Soc London 141:453–472
Kay RW (1977) Geochemical constraints on the origin of Aleutian magmas. In: Talwani M, Pitman WW III (eds) Island arcs, deep sea trenches and back arc basins. M. Ewing Ser 1. Am Geophys Union, pp 229–242
Langmuir CH, Vocke RD JR, Hanson GN, Hart SR (1978) A general mixing equation with applications to Icelandic basalts. Earth Planet Sci Lett 37:380–392
Leeman WP, Hawkesworth CJ (1986) Open magma systems: trace element and isotopic constraints. J Geophys Res 91 (B6):5901–5912
McCulloch MT, Perfit MR (1981) 143Nd/144Nd, 87Sr/86Sr and trace element constraints on the petrogenesis of Aleutian island arc magmas. Earth Planet Sci Lett 56:167–179
McKenzie D (1985) The extraction of magma from the crust and mantle. Earth Planet Sci Lett 74:81–91
McLennan SM, Taylor SR (1981) Role of subducted sediments in island-arc magmatism: constraints from REE patterns. Earth Planet Sci Lett 54:423–430
Morris JD, Hart SR (1983) Isotopic and incompatible element constraints on the genesis of island arc volcanics from Cold Bay and Amark Island, Aleutians and implications for mantle structure. Geochim Cosmochim Acta 47:2015–2030
Nohda S (1984) Classification of island arcs by Nd-Sr isotopic data. Geochem J 18:1–9
Nohda S, Wasserburg GJ (1986) Trends of Sr and Nd isotopes through time near the Japan Sea in northeastern Japan. Earth Planet Sci Lett 78:157–167
Nye CJ, Reid MR (1986) Geochemistry of primary and least fractionated lavas from Okmok volcano, central Aleutians: implications for arc magmagenesis. J Geophys Res 91 (B10):271–287
O'Hara MJ (1985) Importance of the “shape” of the melting regime during partial melting of the mantle. Nature 314:58–62
O'Hara MJ, Mathews RE (1981) Geochemical evolution in an advancing, periodically replenished, periodically tapped, continuously fractionated magma chamber. J Geol Soc London 38:237–277
O'Nions RK, Carter SR, Cohen RS, Evenson NM, Hamilton PJ (1978) Pb, Nd and Sr isotopes in oceanic feromanganese deposits and ocean floor basalts. Nature 273:435–436
Pearce JA (1983) Role of the subcontinental lithosphere in magma genesis at active continental margins. In: Hawkesworth CJ, Norry MJ (eds) Continental basalts and mantle xenoliths. Shiva Publishing, Nantwich, pp 230–249
Pearce JA, Alabaster T, Shelton AW, Searle MP (1981) The Oman ophiolite as a Cretaceous arc — basin complex: evidence and implications. Philos Trans R Soc London 300A:299–317
Perfit MR, Gust DA, Bence AE, Arculus RJ, Taylor SR (1980) Chemical characteristics of island-arc basalts: implications for mantle sources. Chem Geol 30:227–256
Ringwood AE (1974) The petrological evolution of island arc systems. J Geol Soc London 130:183–204
Rogers G (1985) A geochemical traverse across the north Chilean Andes. Ph D thesis, Open University, p 333
Rogers NW, Hawkesworth CJ, Parker RJ, Marsh JR (1985) The geochemistry of potassic lavas from Vulsini, central Italy and implications for mantle enrichment processes beneath the Roman region. Contrib Mineral Petrol 90:244–257
Saunders AD, Tarney J, Weaver SD (1980) Transverse geochemical variations across the Antarctic Peninsula: implications for the genesis of calc-alkaline magmas. Earth Planet Sci Lett 46:344–360
Tatsumi Y, Hamilton DL, Nesbitt RW (1986) Chemical characteristics of fluid phase released from a subducted lithosphere and origin of arc magmas: evidence from high-pressure experiments and natural rocks. J Volcanol Geotherm Res 29:293–309
Tera F, Brown L, Morris J, Sacks IS, Klein J, Middleton R (1986) Sediment incorporation in island arc magmas: inferences from 10Be. Geochim Cosmochim Acta 50:535–550
Thirlwall MF, Graham AM (1984) Evolution of high-Ca, high-Sr C-series basalts from Grenada, Lesser Antilles: the effects of intracrustal contamination. J Geol Soc London 141:427–445
Thorpe RS, Francis PW, O'Callaghan L (1984) Relative roles of source composition, fractional crystallisation and crustal contamination in the petrogenesis of Andean volcanic rocks. Philos Trans R Soc London A310:675–692
White WM, Dupre B (1986) Sediment subduction and magma genesis in the Lesser Antilles: isotopic and trace element constraints. J Geophys Res 91:5927–5941
White WM, Hofmann AW (1982) Sr and Nd isitope geochemistry of oceanic basalts and mantle evolution. Nature 296:821–825
White WM, Dupre B, Vidai P (1985) Isotope and trace element geochemistry of sediments from the Barbados ridge and Demerara Plain region, Atlantic Ocean. Geochim Cosmochim Acta 49:1875–1886
Whitford DJ, Jezek PA (1979) Origin of late Cenozoic lavas from the Banda arc, Indonesia: trace element and Sr isotope evidence. Contrib Mineral Petrol 68:141–150
Whitford DJ, Nicholls IA, Taylor SR (1979) Spatial variations in the geochemistry of Quaternary lavas across the Sunda arc in Java and Bali. Contrib Mineral Petrol 70:341–356
Whitford DJ, White WM, Jezek PA (1981) Neodymium isotopic composition of Quaternary island arc lavas from Indonesia. Geochim Cosmochim Acta 45:989–995
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Ellam, R.M., Hawkesworth, C.J. Elemental and isotopic variations in subduction related basalts: evidence for a three component model. Contr. Mineral. and Petrol. 98, 72–80 (1988). https://doi.org/10.1007/BF00371911
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DOI: https://doi.org/10.1007/BF00371911