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Relationships between granite-gneiss terrains, greenstone belts and granulite belts in the archean crust of Lapland (Fennoscandia)

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Zusammenfassung

Die archaische Kruste von Lapland (Fennoscandia) besteht von Nord nach Süd aus vier Einheiten: (1) der Inarijärvi-Kern, ein alter Grundgebirgskomplex mit Gneisen und Grünschiefem; (2) der Granulit-Gürtel mit mächtigen terrigenen Metasedimenten, in die kleine Kalkalkaliplutone intrudierten; (3) der Tana-Gürtel, der aus tholeiitischen Metavulkaniten besteht; (4) eine Gruppe von Gneisdomen, die von jüngeren Grünschieferzonen umgeben werden.

Wir nehmen an, daß der Tana-Gürtel und der Granulit-Gürtel eine Sutur zwischen einem älteren Kern im Norden (Kola-Kraton) und dem nördlichen Teil des archaischen Grundgebirges von Zentralfinnland bildet.

Abstract

The Archean crust of Lapland (Fennoscandia) consists of four units (from north to south): (1) the Inarijärvi nucleus, old basement complex of gneisses and greenstones, (2) the granulite belt, thick terrigenous metasedimentary sequence intruded by small amounts of calc-alkaline plutonic rocks, (3) the Tana River belt composed of tholeiitic metavolcanics, and (4) a set of gneiss domes fringed with younger greenstone belts.

The main feature of their metamorphic and tectonic evolution are described. Geodynamic models applied to the Archean are discussed and a crustal evolutionary model suitable for this region is proposed.

We assume that the Tana River and granulite belts represent a suture between an older domain in the north (craton of Kola Peninsula) and the northern part of the Archean basement of Central Finland.

Résumé

La croûte archéenne de Laponie (Fennoscandie) comprend quatre unités principales. Ce sont du Nord au Sud: (1) le nucleus de l'Inarijärvi, formé par un vieux socle complexe avec des gneiss et des roches vertes, (2) la ceinture granulitique, à l'origine formée par une épaisse séquence sédimentaire térrigène et par des intrusions calcoalcalines, (3) la ceinture de la Tana River composée de métavolcanites tholéitiques et, (4) un ensemble de dÔmes de gneiss flanqués de jeunes ceintures de roches vertes.

Les grands traits de l'évolution tectonométamorphique de cet ensemble sont décrits. Les modèles géodynamiques archéens classiques sont discutés et un modèle d'évolution crustale pour cette région est proposé.

Nous pensons que la ceinture de la Tana River et celle des granulites représentent une suture entre un domaine ancien au Nord (craton de la Péninsule de Kola) et la partie septentrionale du socle archéen de Finlande centrale.

кРАткОЕ

сОДЕРжАНИЕ АРхЕИскИЕ пОРОДы лАп лАНДИИ (ФЕНО-скАНДИь) с ОстОьт Иж 4-х ЕДИНИц (с сЕВЕРА НА Уг): А) ьДРО Inarijärvi, ьВльУЩЕЕсь ДРЕВНИМ кОМплЕксОМ ФУНДАМЕН тА, сОстАВлЕННОгО гНЕИс АМИ И жЕлЕНОкАМЕННыМ И пОРОДАМИ; Б) гРАНУлИтОВыИ пОьс, пРЕДстАВлЕННыИ МОЩНыМш МАтЕРИкОВыМ И МЕтАсЕДИМЕНтАМИ, пРО НИжАННыМИ НЕБОлышИМИ кОлИЧЕст ВАМИ ИНтРУжИИ кАльцИ ЕВО-ЩЕлОЧНых плУтОНОВых пОРОД; В) пОьс РЕкИ тАНА, кОтОРыИ сОстОИт Иж тО лЕИтОВых МЕтАВУлкАНИтОВ И г) РьД гНЕИсОВых кУпО лОВ, ОкАМлЕННых БОлЕЕ пОжДНИМИ пОьсАМИ жЕлЕНОкАМЕННых пОРО Д.

РАжРАБОтАНА НОВАь гЕ ОДИНАМИЧЕскАь МОДЕл ь Дль АРхЕь В ДАННОМ РЕгИОНЕ.

АВтОРы пРЕДпОлАгАУт, ЧтО РЕкА тАНА И гРАНУл ИтОВыЕ пОьсА пРЕДстАВльУт сОБОИ шОВ МЕжДУ БОлЕЕ ДРЕВНИМИ пОРОДАМИ НА сЕВЕРЕ (кРАтОк кОльскОгО пОл УОстРОВА) И сЕВЕРНОИ ЧАстьУ АРх ЕИскОгО ФУНДАМЕНтА ц ЕНтРАльНОИ ФИНлАНДИИ.

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Author notes

  1. P. Barbey

    Present address: Laboratoire de Pétrologie, Université de Nancy, c. o. 140, 54037, Nancy Cedex, France

  2. J. Convert, H. Martin, B. Moreau, R. Capdevila & J. Hameurt

    Present address: Institut de Géologie, Université de Rennes, Campus de Beaulieu, 35042, Rennes Cedex, France

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    1. P. Barbey
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    Barbey, P., Convert, J., Martin, H. et al. Relationships between granite-gneiss terrains, greenstone belts and granulite belts in the archean crust of Lapland (Fennoscandia). Geol Rundsch 69, 648–658 (1980). https://doi.org/10.1007/BF02104639

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