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The evolution of the Precambrian Shield of Greenland

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Zusammenfassung

Das Archaische Kraton Grönlands ist aus Gneisen, Amphiboliten, anorthositischen und untergeordneten Suprakrustal-Gesteinen aufgebaut. Es enthält die ältesten bis jetzt gefundenen krustalen Gesteine. Das Archaische Kraton ist gegen Norden und gegen Süden von Proterozoischen Orogenen begrenzt. Die Nagssugtoqidischen und Rinkischen Orogene gegen Norden, die sich durch ihre verschiedene tektonische Entwicklung unterschieden, bestehen hauptsächlich aus aufgearbeiteten Archaischen Gesteinen. Früh-Proterozoische Suprakrustal-Gesteine spielen eine wichtige Rolle im Rinkischen Orogen, wo sie das Archaische Grundgebirge überlagern. Gegen Süden besteht das Ketilidische Orogen hauptsächlich aus Proterozoischen Suprakrustal-Gesteinen und Graniten. Nach erneuerter Denudation wurden spätproterozoische Suprakrustal-Gesteine in Nord- und Südgrönland abgelagert. Diese sind assoziiert mit bedeutenden Mengen von spätproterozoischen Intrusivgesteinen.

Abstract

The Archaean gneiss block of Greenland is made up of gneisses, amphibolites, anorthositic rocks and minor supracrustals. It contains the oldest crustal rocks yet recorded on earth. The Archaean gneiss block is bordered to the north and to the south by Proterozoic mobile belts. The Nagssugtoqidian and Rinkian mobile belts to the north, differentiated on the basis of differences in the tectonic development, consist mainly of reworked Archaean rocks. Early Proterozoic supracrustal rocks are prominent in the Rinkian mobile belt, where they overlie the Archaean basement. The Ketilidian mobile belt to the south consists mainly of Proterozoic supracrustal rocks and granites. After renewed denudation late Proterozoic supracrustal rocks were deposited in North and South Greenland where they are associated with large amounts of late Proterozoic intrusive rocks.

Résumé

Le socle archéen du Groenland est composé principalement de gneiss, d'amphibolites et d'anorthosites avec accessoirement des roches supracrustales. Dans ce socle se trouvent les roches les plus âgées de l'écorce terrestre trouvées jusqu'à présent. Au nord et au sud, le socle archéen est flanqué par des ceintures orogéniques protérozoïques. Au nord on trouve le Nagssugtoqidien et le Rinkien qui ont des styles tectoniques différents, et sont composés principalement de roches archéennes transformées. Dans le Rinkien les roches supracrustales du début du Protérozoique jouent un rôle important; elles y recouvrent les gneiss archéens. Au sud du socle archéen, la ceinture orogénique du Kétilidien est composée principalement de roches supracrustales et de granite protérozoïques. Après une période de dénudation intense, des sédiments et des laves d'âge protérozoïque tardif se sont déposées gans le nord et le sud du Groenland en association avec d'abondantes roches intrusives.

Краткое содержание

Архейский кратон Гре нландии, составленны й гнейсами, амфиболитами, анортозитовыми и вто ростепенными субкру стальными породами, содержит древнейшие, на сегодн яшний день установле нные, породы коры. Архейский кратон ограничен с се вера и юга протерозой скими орогенами; Нагсугток ский и ринкский орогены на севере, тектоническо е развитие которых протекало пр и различных условиях, с остоят гл. обр. из мобил изованных архейских пород. Раннепротерозойски е породы поверхностн ой коры играют важную роль в ринкском орогене, зал егая на архейском фун даменте. Кетилидский ороген н а юге состоит гл. обр. из п ротерозойских пород верхней коры и гранитов. После последующей денудац ии на юге и севере Грен ландии отложились позднепр отерозойские субкрустальные поро ды, а затем они были пер екрыты значительными количествами поздне протеродойских интр узивных пород.

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Kalsbeek, F. The evolution of the Precambrian Shield of Greenland. Geol Rundsch 71, 38–60 (1982). https://doi.org/10.1007/BF01825023

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