Abstract
The Tojottamanselkä gneisses of the Koitelainen region, northern Finland, have been dated by the Sm-Nd and the common Pb methods. The Sm-Nd data of seven samples from a small area (100 m × 100 m) define an isochron ofT=3.06±0.12 (2σ) Ga, with correspondingI Nd=0.50848±9 (2σ), orε Nd(T)=−3.7±1.8. This age is in good agreement with the zircon U-Pb discordia age (3.1 Ga) reported by Kröner et al. (1981) and is interpreted as the time of magmatic emplacement. The distinctly negativeε Nd(T) value is found for the first time for Archean tonalitic gneisses and implies derivation of these magmas by remelting of continental material with a long (200–500 Ma) crustal residence time. A few samples, on the other hand, possessε Nd(T) values close to zero, hence they are thought to be derived by partial melting of basaltic sources with nearchondritic REE distribution patterns.
Common Pb isotopic data yield an isochron age of 2.64±0.24 (2σ) Ga which is in agreement, within error limit, with the published Rb-Sr isochron age of 2.73±0.24 Ga (Kröner et al. 1981). The age of ca. 2.7 Ga is interpreted as the time of regional metamorphism during which both Pb and Sr isotopes were rehomogenised.
The tonalitic gneisses have highly fractionated REE patterns with (La/Yb)N ratios varying from 9 to 43. Like most Archean gneisses of TTG composition (tonalite-trondhjemite-granodiorite), they could be derived by partial melting of crustal sources of basaltic to granodioritic compositions. Direct derivation by melting of mantle peridotites is excluded.
The present geochemical study indicates that the Tojottamanselkä gneisses have had a very complex history that involved multi-stage development. Together with the published age data for the basement gneisses and greenstone belts of eastern central Finland (Vidal et al. 1980; Martin et al. 1983a), we conclude that the Archean crustal development in Finland started at least 3.5 Ga ago and passed through a series of magmatic and metamorphic events at 3.1, 2.85, 2.65 and 2.5 Ga before the final intrusions of K-rich granites about 2.4 Ga ago.
Similar content being viewed by others
References
Allègre CJ, BenOthman D (1980) Nd-Sr isotopic relationship in granitoid rocks and continental crust development: a chemical approach to orogenesis. Nature 286:335–342
Arth JG, Hanson GN (1972) Quartz diorite derived by partial melting of eclogite or amphibolite at mantle depths. Contrib Mineral Petrol 37:161–174
Arth JG, Hanson GN (1975) Geochemistry and origin of the early Precambrian crust of northeastern Minnesota. Geochim Cosmochim Acta 39:325–362
Arth JG, Barker F, Peterman ZE, Friedman I (1978) Geochemistry of the gabbro-diorite-tonalite-trondhjemite suite of southwest Finland and its implications for the origin of tonalite and trondhjemite magmas. J Petrol 19:289–316
Auvray B, Blais S, Jahn BM, Piquet D (1982) Komatiites and the komatiitic series of the Finnish greenstone belts. In: Komatiites, Arndt NT, Nisbet EG (eds), George Allen and Unwin, London, 131–146
Barker F, Arth JG (1976) Generation of trondhjemite-tonalite liquids and Archean bimodal trondhjemite-basalt suites, Geology 4:596–600
Barker F (1979) Trondhjemite: definition, environment and hypothesis of origin. In: Barker F (ed) Trondhjemites, dacites and related rocks. Elsevier, Amsterdam, 1–12
Barbey P (1982) Signification géodynamique des domaines granulitiques. La ceinture des granulites de Laponie (Fennoscandie): une suture de collison continentale d'age Protérozoïque inférieur, reconstitution géochimique et pétrologique. Thèse d'Etat, Nancy/Rennes, pp 346
Barbey P, Convert J, Martin H, Moreau B, Capdevila R, Hameurt J (1980) Relationships between granite-gneiss terrains, greenstone belts and granulite belts in the Archean crust of Lapland (Fennoscandia), Geol Rundsch 69:648–658
Bernard-Griffiths J, Peucat JJ, Postaire B, Vidal Ph, Convert J, Moreau B (1984) Isotopic data (U-Pb, Rb-Sr, Pb-Pb and Sm-Nd) on mafic granulites from Finnish Lapland. Precambrian Res 23:325–348
Blais S, Auvray B, Bertrand JM, Capdevilla R, Vidal P (1977) Les grands traits géologiques de la ceinture archéenne de roches vertes de Suomussalmi-Kuhmo (Finlande orientale), Bull Soc Géol Fr 19:1033–1039
Blais S, Auvray B, Capdevilla R, Jahn BM, Bertrand JM, Hameurt J (1978) The Archean greenstone belts of Karelia (eastern Finland) and their komatiitic and tholeiitic series. In: Archean Geochemistry, Windley BF, Naqvi SM (eds), Elsevier, Amsterdam, 87–107
Compton P (1978) Rare earth evidence for the origin of the Nûk gneisses, Buksefjorden region, southern West Greenland, Contrib Mineral Petrol 66:283–294
Condie KC (1981) Archean greenstone belts. Developments in Precambrian Geology 3, Elsevier, Amsterdam, pp 434
Condie KC, Hunter DR (1976) Trace element geochemistry of Archean granitic rocks from the Barberton region, South Africa. Earth Planet Sci Lett, 29:389–400
Convert J (1981) Les granulites à orthopyroxène de Laponie (Finlande et Norvège). Pétrologie et géochimie. Thèse 3ème cycle, Univ de Rennes, pp 181
Drury SA (1978) REE distributions in a high-grade Archean gneiss complex in Scotland: implications for the genesis of ancient sialic crust. Precambrian Res 7:237–257
Eskola P (1963) The Precambrian of Finland. In: Rankama K (ed) The Geologic Systems. The Precambrian Vol 1, John Wiley, NY, 145–266
Gaál G, Mikkola A, Soderholm B (1978) Evolution of the Archean crust in Finland. Precambrian Res 6:199–215
Glikson AY (1976) Trace element geochemistry and origin of early Precambrian acid igneous series, Barberton Mountain Land, Transvaal, Geochim Cosmochim Acta 40:1261–1280
Glikson AY (1979) Early Precambrian tonalite-trondhjemite sialic nuclei. Earth Planet Sci Rev 15:1–73
Hunter DR, Barker F, Millard HT (1978) The geochemical nature of the Archean ancient gneiss complex and granodiorite suite, Swaziland: a preliminary study. Precambrian Res 7:105–127
Jahn BM, Sun SS (1979) Trace element distribution and isotopic composition of Archean greenstones. In: Origin and distribution of the elements, Second Symposium, Ahrens LH (ed), Pergamon Press, Oxford, 597–618
Jahn BM, Auvray B, Blais S, Capdevila R, Cornichet J, Vidal F, Hameurt J (1980a) Trace element geochemistry and petrogenesis of Finnish greenstone belts. J Petrol 21:201–244
Jahn BM, Bernard-Griffiths J, Charlot R, Cornichet J, Vidal F (1980b) Nd and Sr isotopic compositions and REE abundances of Cretaceous MORB (Holes 417D and 418A, Legs 51, 52 and 53). Earth Planet Sci Lett 48:171–184
Jahn BM, Glikson AY, Peucat JJ, Hickman AH (1981) REE geochemistry and isotopic data of Archean silicic volcanics and granitoids from the Pilbara Block, Western Australia: implications for the early crustal evolution. Geochim Cosmochim Acta 45:1633–1652
Kouvo O, Tilton GR (1966) Mineral ages from the Finnish Precambrian. J Geol 74:421–442
Kröner A, Puustinen K, Hickman M (1981) Geochronology of an Archean tonalitic gneiss dome in northern Finland and its relation with an unusual overlying volcanic conglomerate and komatiitic greenstone. Contrib Mineral Petrol 76:33–41
Martin H, Chauval C, Jahn BM, Vidal P (1983a) Rb-Sr and Sm-Nd ages and isotopic geochemistry of Archean granodioritic gneisses from eastern Finland. Precambrian Res 20:79–91
Martin H, Chauvel C, Jahn BM (1983b) Major and trace element geochemistry and crustal evolution of Archean granodioritic rocks from eastern Finland, Precambrian Res 21:159–180
Martin H, Querré G (1984) A 2.5 Ga reworked sialic crust: Rb-Sr ages and isotopic geochemistry of late Archean volcanic and plutonic rocks from E. Finland, Contrib Mineral Petrol 85:292–299
Masuda A, Nakamura N, Tanaka T (1973) Fine structures of mutually normalized rare-earth patterns of chondrites, Geochim Cosmochim Acta 37:239–248
Mikkola E (1941) Kivilajikartan selitys (English summary) Sheets B7-C7-D7, Muonio-Sodankylä-Tuntsajoki, General Geol Map of Finland, 1∶400000 Geol Surv Finland, pp 286
Moorbath S (1977) Ages, isotopes and evolution of Precambrian continental crust. Chem Geol 20:151–187
Moorbath S (1978) Age and isotope evidence for the evolution of continental crust. Phil Trans R Soc London, Ser A 288:401–413
Moorbath S, Taylor PN, Goodwin R (1981) Origin of granitic magma by crustal remobilisation: Rb-Sr and Pb-Pb geochronology and isotope geochemistry of the late Archean Qôrqut granite complex of southern West Greenland, Geochim Cosmochim Acta 45:1051–1060
Moreau B (1980) Pétrologie et géochimie des anorthosites de Laponie (Finlande): exemples du massif de Vaskojoki et Mutajarvi, Thèse 3ème cycle, Univ de Rennes, pp 267
Mutanen T (1976) Komatiites and komatiite provinces in Finland, Geologi 28:49–56
Nance WB, Taylor SR (1976) Rare earth element patterns and crustal evolution — I. Australian post-Archean sedimentary rocks. Geochim Cosmochim Acta, 40:1539–1551
Nance WB, Taylor SR (1977) Rare earth element patterns and crustal evolution — II. Archean sedimentary rocks from Kalgoolie, Australia. Geochim Cosmochim Acta 41:225–231
O'Connor JT (1965) A classification for quartz-rich igneous rocks based on feldspar ratio. US Geol Surv Prof Pap 525 B:79–84
O'Nions RK, Pankhurst RJ (1974) Rare earth element distribution in Archean gneisses and anorthosites, Gotthab area, West Greenland. Earth Planet Sci Lett 22:328–338
O'Nions RK, Evensen NM, Hamilton PJ (1979) Geochemical modelling of mantle differentiation and crustal growth. J Geophys Res 84:6091–6101
Patchett PJ, Kouvo O, Hedge CE, Tatsumoto M (1981) Evolution of continental crust and mantle heterogeneity: evidence from Hf isotopes, Contrib Mineral Petrol 78:279–297
Puustinen K (1977) Exploration in the northeast region of the Koitelainen gabbro complex, Sodankylä, Finnish Lapland. In: Davis GR (ed) Prospecting in areas of glaciated terrain, Inst Min Met London, 6–13
Stacey JS, Kramers JD (1975) Approximation of terrestrial lead isotope evolution by a two-stage model. Earth Planet Sci Lett 26:207–221
Tarney J, Weaver B, Drury A (1979) Geochemistry of Archean trondhjemitic and tonalitic gneisses from Scotland and east Greenland. In: Barker F (ed) Trondhjemites, dacites and related rocks. Elsevier, Amsterdam, 275–299
Vidal P (1976) L'évolution polyorogénique du Massif Armoricain: apport de la géochronologie et de la géochimie isotopique du strontium. Thèse d'Etat, Univ de Rennes, pp 142
Vidal P, Blais S, Jahn BM, Capdevila R, Tilton GR (1980) U-Pb and Rb-Sr systematics of the Suomussalmi Archean greenstone belt (Eastern Finland). Geochim Cosmochim Acta 44:2033–2044
Vidal P, Auvray B, Charlot R, Cogné J (1981) Precadomian relicts in the Armorican Massif: their age and role in the evolution of the western and central European Cadomian-Hercynian belt. Precambrian Res 14:1–20
York D (1966) Least squares fitting of a straight line, Can J Phys 44:1079–1084
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Jahn, Bm., Vidal, P. & Kröner, A. Multi-chronometric ages and origin of Archaean tonalitic gneisses in Finnish Lapland: A case for long crustal residence time. Contr. Mineral. and Petrol. 86, 398–408 (1984). https://doi.org/10.1007/BF01187143
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01187143