The age of carbonatites, kimberlites and lamprophyres from southern West Greenland; recurrent alkaline magmatism during 2500 millions years

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doi: 10.1016/0024-4937(83)90025-7
Authors:Larsen, Lotte Melchior; Rex, David C.; Secher, Karsten
Author Affiliations:Primary:
Grønlands Geol. Undersøgelse, Copenhagen 1350, Denmark
Leeds Univ., United Kingdom
Volume Title:Lithos (Oslo)
Source:Lithos (Oslo), 16(3), p.215-221. Publisher: Elsevier, Amsterdam, International. ISSN: 0024-4937
Publication Date:1983
Note:In English. 2 p. refs.; illus. incl. 2 tables, sketch map
Summary:Alkaline rocks were intruded into the Precambrian basement in southern W Greenland during at least five separate episodes. The Tupertalik carbonatite intrusion was emplaced around or before 2650 m.y.; it is now metamorphosed in the granulite facies but is recognizable by its trace-element content. Lamprophyre dykes were intruded at approx 1800 m.y. and again at approx 1200 m.y. At approx 600 m.y., the Sarfartoq carbonatite intrusion and extensive kimberlite dykes were emplaced in the Holsteinsborg-Sondre Stromfjord region. At 225-115 m.y. the Qaqarssuk carbonatite complex was emplaced in the Sukkertoppen region, and numerous lamprophyre and kimberlite dykes were emplaced between Fiskenaesset and Ivigtut. All these episodes are correlatable with contemporaneous alkaline activity in Canada and Scandinavia and substantiate the periodicity of carbonatite emplacement. The Mesozoic suite of intrusions is related to rifting prior to continental break-up and the formation of the North Atlantic Ocean. The Eocambrian suite of 600 m.y. is thought to have formed under similar conditions during continental break-up and the formation of the Iapetus Ocean. (Authors' abstract) [G.R.]
Subjects:Absolute age; Carbonatites; Dates; Dikes; Geochronology; Igneous rocks; Intrusions; K/Ar; Lamprophyres; Petrology; Plutonic rocks; Arctic region; Greenland; Southwestern Greenland
Abstract Numbers:84M/1202
Record ID:1985084262
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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