Abstract
Major and trace element data of samples from the approximately 590 Ma Grenville dyke swarm, in the southeastern parts of the Canadian Shield, were used to evaluate the extent of crustal contamination of the dyke magma and to model its probable mantle source. The dyke rocks are mostly saturated, quartz tholeiites. A few samples represent transitional basalts. Their overall chemistries are similar to those of continental flood basalts. Their compositions resemble those of liquids initially produced in the garnet peridotite mantle zone and then subjected to polybaric fractionation. However, fractionation models fail to mass-balance Ti, Fe, K, and P. Geochemical and isotopic criteria indicate that crustal contamination was minimal. The incompatible elements Zr, Y, K, Rb, Nb, V, Ta, Hf, and Th show hyperbolic elemental ratio-ratio distributions indicative of mixing between two end-members. One end-member has elemental ratios similar to those of a “depleted” N-MORB source and the second of a P-MORB i.e. ◂ertile” or “plume” MORB source. The more enriched dyke compositions can be successfully reproduced by mixing models in the ratio of 6:1 between the most depleted “MORB-like” dyke magma and a liquid composition similar to metasomatic glass veinlets coexisting with mica peridotite mantle xenoliths, and subsequent crystal fractionation. The Grenville dykes are probably a synrift swarm that was emplaced along a rift arm related to an Iapetan rrr triple junction that is thought to have formed over a mantle plume. The chemistry of the dyke swarm is consistent with its derivation from a plume head, in that the minor enriched source can be identified with plume-source mantle and the major depleted source with entrained mantle. The magma probably originated in the upper cooler parts of the plume head.
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References
Allègre CJ, Minster JF (1978) Quantitative models of trace element behaviour in magmatic processes. Earth Planet Sci Lett 38:1–25
Arculus RJ, Powell R (1987) The significance of source versus process in the tectonic controls of magma genesis. J Volcanol Geotherm Res 32:1–12
Arndt NT (1976) Melting relations of ultramafic lavas (komatiites) at 1 atm and high pressure. Carnegie Inst Washington yearb 75:555–561
Basaltic Volcanism Study Project (1981) Basaltic volcanism on the terrestrial planets. Pergamon, New York
Bell K, Blenkisop J (1977) Geochronological programme 1976: Upper Gatineau area study. Internal Report, Geological Survey of Canada
Brique 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 68:297–308
Cadman A (1991) The petrogenesis and emplacement of Proterozoic dyke swarms. Part 2: geochemical processes and paleostress analysis. Current Res Newfoundland Geol Surv Rep 91-1: 179–190
Campbell IH, Griffiths RW (1991) Megaplumes and giant radiating dyke swarms (abstract). Geol Assoc Canada Annual Meeting, Toronto, Abstracts: A19
Campbell IH, Griffiths RW (1990) Implications of mantle plume structure for the evolution of flood basalts. Earth Planet Sci Lett 99:79–93
Carlson RW, Lugmair GW, Macdougall JD (1981) Columbia River volcanism: the question of mantle heterogeneity or crustal contamination. Geochim Cosmochim Acta 45:2483–2499
Coish RA, Sinton CW (1992) Geochemistry of mafic dikes in the Adirondack mountains: implications for the constitution of Late Proterozoic mantle. Contrib Mineral Petrol 110:500–514
Cox KG (1988) The Karoo province. In: Macdougall JD (ed) Continental flood basalts. Kluwer, Netherlands, pp 239–271
Cox KG, Hawkesworth CJ (1984) Relative contribution of the crust and mantle to the flood basaltic magmatism. Mahabaleshwar area, Deccan traps. Phil Trans R Soc London Ser A 310:627–642
Edgar AD, Lloyd FE, Forsyth DM, Barnett RL (1989) Origin of glass in upper mantle xenoliths from the Quaternary volcanics of Gees, West Eifel, Germany. Contrib Mineral Petrol 103:277–286
Francis D (1976) The origin of amphibole in Iherzolite xenoliths from Nunivak Island, Alaska. J Petrol 17:357–387
Francis D (1991) Some implications of xenolith glasses for the mantle sources of alkaline mafic magmas. Contrib Mineral Petrol 108:175–180
Frey FA, Green DH, Roy SD (1978) Integrated models of basalt petrogenesis: a study of quartz tholeiites to olivine melilites from southeastern Australian petrological data. J Petrol 19:463–513
Goldberg SA, Butler JR, Fullagar PD (1986) The Bakersville dike swarm: geochronology and petrogenesis of late Proterozoic basaltic magmatism in the southern appalachian Blue Ridge. Am J Sci 286:403–430
Halls HC (1987) Dyke swarms and continental rifting: some concluding remarks. Geol Assoc Can Spec Pap 34:483–491
Hart WK, Wolde Gabriel G, Walter RC, Mertzman SA (1989) Basaltic volcanism in Ethiopia: constraints on continental rifting and mantle interactions. J Geophys Res 94:7731–7748
Hawkesworth CJ, Vollmer R (1979) Crustal contamination versus enriched mantle: 143Nd/144Nd and 87Sr/86Sr evidence from the Italian volcanics. Contrib Mineral Petrol 69:151–165
Hawkesworth CJ, Erlank AJ, Marsh JS, Menzies MA, Van Calsteren P (1983) Evolution of the continental lithosphere: evidence from volcanics and xenoliths in southern Africa. In: Hawkesworth CJ, Norry MJ (eds) Continental basalts and mantle xenoliths. Shiva, Nantwich, Cheshire, pp 111–138
Hawkesworth CJ, Kempton PD, Rogers NW, Ellam RM, Van Calsteren PW (1990) Continental mantle lithosphere, and shallow level enrichment processes in the Earth's mantle. Earth Planet Sci Lett 96:256–268
Hildreth W, Halliday AN, Christiansen RL (1991) Isotopic and chemical evidence concerning the genesis and contamination of basaltic and rhyolitic magma beneath the Yellowstone Plateau volcanic field. J Petrol 32:63–138
Hill RI (1993) Mantle plumes and continental tectonics. Lithos 30:193–206
Hoffman AW, Jochum KP, Scufert M, White WM (1986) Nb and Pb in oceanic basalts: new constraints on mantle evolution. Earth Planet Sci Lett 79:33–45
Hooper PR (1988) The Columbia River basalt. In: Macdougall JD (ed) Continental flood basalts. Kluwer, Netherlands, pp 1–33
Irvine TN, Baragar WRA (1971) A guide to the chemical classification of volcanic rocks. Can J Earth Sci 8:523–548
Jaques AL, Green DH (1980) Anhydrous melting of periodotites at 0–15 K bars pressure and the genesis of tholeiitic basalts. Contrib Mineral Petrol 73:287–310
Kamo SL, Kumarapeli PS, Krogh TE (1991) Further constraints on the opening of the Iapetus Ocean: U-Pb ages for rift-related igneous activity from the Ottawa Graben, Ontario-Quebec, Canada (abstract) IGCP 257 meeting on Mafic Dyke Swarms, Sao Paulo, Brazil, Sept 29–Oct 5, 1991, p 143
Kostopoulos D (1991) Melting of the shallow upper mantle: a new perspective. J Petrol 32:671–699
Kostopoulos D, Simon DJ (1992) Parameterization of the melting regime of the shallow upper mantle and the effects of variable lithospheric stretching on modal stratification and trace element concentrations in magmas. J Petrol 33:665–691
Kretz R, Hartree R, Garrett D, Cermignani C (1985) Petrology of the Grenville swarm of gabbro dikes, Canadian Precambrian Shield. Can J Earth Sci 22:53–71
Kumarapeli PS (1985) Vestiges of Iapetan rifting in the craton west of the northern Appalachians. Geoscience Canada 12:54–59
Kumarapeli PS (1993) A plume-generated segment of the rifted margin of Laurentia, southern Canadian Appalachians, seen through a completed Wilson cycle. Tectonophysics 219:47–55
Kumarapeli PS, Isachsen I (1991) Mantle plume connections of the Grenville-Adirondack dyke swarms (abstract). Geol Assoc Canada Annual Meeting, Toronto, Abstracts:A68
Kumarapeli PS, Dunning GR, Pintson H, Shaver J (1989) Geochemistry and U-Pb zircon age of comenditic metafelsites of the Tibbit Hill Formation, Quebec Appalachians. Can J Earth Sci 26:1374–1383
Kumarapeli PS, St. Seymour KS and Fowler A, Pintson H (1990) The problem of the magma source of a giant radiating mafic dyke swarm. In: Parker AJ, Rickwood PC, Tucker DH (eds) Mafic dykes and emplacement mechanisms. Balkema, Rotterdam, pp 163–171
Langmuir CH, Hanson GN (1980) An evaluation of major element heterogeneity in the mantle source regions of basalts. Phil Trans R Soc London Ser A 297:383–407
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
Le Bas MJ, Le Maitre RW, Streckeisen A, Zanettin B (1986) A chemical classification of volcanic rocks based on the total alkali-silica diagram. J Petrol 27:745–750
Leat PT, Thompson RN, Morrison MA, Hendry GL, Dickin AP (1988) Compositionally-diverse Miocene-Recent rift-related magmatism in northwest Colorado: partial-melting, and mixing of mafic magmas from 3 different asthenospheric and lithospheric magma sources. J Petrol Spec Lihosphere Issue: 351–377
Leeman WP, Hawkesworth CJ (1986) Open magma systems: trace element and isotopic constraints. J Geophys Res 91:5901–5912
Mahoney JJ, Macdougall JD, Lugmair GW, Sankar Das M, Murali AV, Gopalan K (1982) Origin of the Deccan Trap flows at Mahabaleshwar inferred from Nd and Sr isotopic and chemical evidence. Earth Planet Sci Lett 60:47–60
Masuda A, Nakamura N, Tanaka T (1973) Fine structures of mutually normalized rare-earth patterns of chondrites. Geochim Cosmochim Acta 37:239–249
Menzies MA, Kyle PR (1990) Continental volcanism: a crust-mantle probe. In: Menzies MA (ed) Continental mantle. Oxford Science Publ. Oxford, pp 157–177
Menzies MA, Leeman WR, Hawkesworth CJ (1983) Isotope geochemistry of Cenozoic volcanic rocks reveals mantle heterogeneity below western U.S.A. Nature 303:205–209
Mereu RF, Wang D, Kuhn O, Forsyth D (1986) Summary of the results of the 1982 long-range seismic experiment across the Ottawa-Bonnechere graben and western Grenville front. Geol Assoc Can Spec Pap 31:235–240
Mitchell RH (1986) Kimberlites: mineralogy, geochemistry and petrology. Plenum, New York
Murthy GD (1971) The paleomagnetism of diabase dikes from the Grenville Province. Can J Earth Sci 8:802–812
Myers RE (1989) Basalt geochemistry and tectonic settings: a new approach to relate tectonic and magmatic processes. Lithos 23:53–62
Mysen BO, Boettcher AL (1975) Melting of a hydrous mantle: II. Geochemistry of crystals and liquids formed by anatexis of mantle peridotite at high pressures and high temperatures as a function of controlled activities of water, hydrogen and carbon dioxide. J Petrol 16:549–593
O'Hara MJ (1968) The bearing of phase equilibria studies in synthetic and natural systems and the origin and evolution of basic and ultrabasic rocks. Earth-Sci Rev 4:69–133
Pintson H, Kumarapeli PS, Morency M (1985) Tectonic significance of the Tibbit Hill Volcanics: geochemical evidence from Richmod area, Quebec. Geol Surv Can Pap 85-1A:123–130
Ratcliffe NM (1987) High TiO2 metadiabase dikes of the Hudson Highlands, New York and New Jersey: possible late Proterozoic rift rocks in the New York recess. Am J Sci 287:817–850
Rogers NW (1992) Potassic magmatism as a key to trace-element enrichment processes in the upper mantle. J Volcanol Geotherm Res 34:283–306
Saunders AD, Tarney J, Marsh NG, Wood DA (1980) Ophiolites as ocean crust or marginal basin crust: a geochemical approach. In: Panaviotou A (ed) Proc Int Ophiolite Symposium Nicosia, Cyprus. Cyprus Geol Surv Dept, Nicosia, pp 193–204
Sen G (1982) Composition of basaltic liquids generated from a partially depleted lherzolite at 9 kbars pressure. Nature 299:336–338
St Seymour KS, Francis D, Ludden J (1983) The petrogenesis of the Lac Guyer komatiites and basalts and nature of the komatiitekomatiitic basalt compositional gap. Contrib Mineral Petrol 84:6–14
Strong DF (1974) Plateau lavas and diabase dikes of northern Newfoundland. Geol Mag 111:501–514
Strong DF, Williams H (1972) Early Paleozoic flood basalts of northwestern Newfoundland: their petrology and significance. Proc Geol Assoc Can 24:43–54
Strong DF, O'Brien SJ, Taylor SW, Strong PG, Wilton DH (1978) Aborted Proterozoic rifting in eastern Newfoundland. Can J Earth Sci 15:117–131
Takahashi E, Kushiro I (1983) Melting of a dry peridotite at high pressures and basalt magma genesis. Am Mineral 68:859–878
Taylor SR, McLennan SM (1985) The continental crust: its composition and evolution. Blackwell Scientific, Oxford
Thompson RN, Morrison MA, Hendry GL, Parry SJ (1984) An assessment of the relative roles of a crust and mantle in magma genesis: an elemental approach. Phil Trans R Soc London Ser A 310:549–590
White RS, McKenzie D (1989) Magmatism at rift zones: the generation of volcanic continental margins and flood basalts. J Geophys Res 94:7685–7729
Wilson M (1989) Igneous petrogenesis: a global tectonic approach. Uniwin Hyman, London
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Seymour, K.S., Stephen Kumarapeli, P. Geochemistry of the Grenville Dyke Swarm: role of plume-source mantle in magma genesis. Contr. Mineral. and Petrol. 120, 29–41 (1995). https://doi.org/10.1007/BF00311006
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DOI: https://doi.org/10.1007/BF00311006