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Late Ordovician to Silurian ensialic magmatism in Liverpool Land, East Greenland: new evidence extending the northeastern branch of the continental Laurentian magmatic arc

Published online by Cambridge University Press:  03 October 2011

LARS EIVIND AUGLAND ,
ARILD ANDRESEN ,
FERNANDO CORFU  and
HANS KRISTIAN DAVIKNES
LARS EIVIND AUGLAND*
Affiliation:
Department of Geosciences, University of Oslo, P. O. Box 1047, Blindern, 0316 Oslo, Norway
ARILD ANDRESEN
Affiliation:
Department of Geosciences, University of Oslo, P. O. Box 1047, Blindern, 0316 Oslo, Norway
FERNANDO CORFU
Affiliation:
Department of Geosciences, University of Oslo, P. O. Box 1047, Blindern, 0316 Oslo, Norway
HANS KRISTIAN DAVIKNES
Affiliation:
Helse- og velferdsetaten, P. O. Box 30, Sentrum, 0101 Oslo, Norway
*
†Author for correspondence: [email protected]
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Abstract

New U–Pb ID-TIMS geochronological and whole-rock geochemical data from the Hurry Inlet Plutonic Terrane in Liverpool Land provide evidence of a Late Ordovician to Silurian magmatic arc in the East Greenland Caledonides. These voluminous granitoid rocks range from meladiorite to monzonite and granite, they are alkali-calcic to calc-alkaline and magnesian, and have characteristic arc granitoid trace element signatures. Zircon data give ages of 446 ± 2 and 438 ± 4 Ma for two phases of the Hurry Inlet Composite Pluton, 426 ± 1 Ma for a meladioritic xenolith in the anatectic Triaselv granite, and 424 ± 1 Ma for the Hodal-Storefjord Pluton. The Late Ordovician plutons can be correlated with similar plutons in the uppermost nappes of the Scandinavian Caledonides, likely representing the northern branch of magmatic arcs formed on the Laurentian margin. Magmatism appears to have continued sporadically until about 425 Ma when a major, short-lived, magmatic event formed the bulk of the batholith on Liverpool Land. This activity was likely mantle-driven and can be correlated with the Newer Granites in Scotland, for which a slab break-off mechanism has been proposed. The increased heat flow from this process can also explain the generation of the crustally derived, syntectonic, two-mica granites, which are the areally most important Caledonian suite in East Greenland.

Keywords

East GreenlandCaledonidesU–Pb ID-TIMS zircon geochronologymagmatic arctectonics
Type
Original Articles
Information
Geological Magazine , Volume 149 , Issue 4 , July 2012 , pp. 561 - 577
Copyright
Copyright © Cambridge University Press 2011

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