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Nd and Pb isotope mapping of crustal domains within the Makkovik Province, Labrador

Published online by Cambridge University Press:  03 April 2018

R. M. MOUMBLOW ,
G. A. ARCURI ,
A. P. DICKIN  and
C. F. GOWER
R. M. MOUMBLOW
Affiliation:
School of Geography and Earth Sciences, McMaster University, Hamilton, Ontario, Canada
G. A. ARCURI
Affiliation:
School of Geography and Earth Sciences, McMaster University, Hamilton, Ontario, Canada Present address: Department of Earth Sciences, University of Western Ontario, London, Ontario, Canada
A. P. DICKIN*
Affiliation:
School of Geography and Earth Sciences, McMaster University, Hamilton, Ontario, Canada
C. F. GOWER
Affiliation:
Department of Natural Resources, Government of Newfoundland and Labrador, St John's, Newfoundland, Canada
*
‡Author for correspondence: dickin@mcmaster.ca
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Abstract

The Makkovik Province of eastern Labrador represents part of an accretionary orogen active during an early stage in the development of the Palaeoproterozoic southern Laurentian continental margin. New Nd isotope data for the eastern Makkovik Province suggest that accreted juvenile Makkovik crust was generated in the Cape Harrison domain during a single crust-forming event at c. 2.0 Ga. Pb isotope data support this model, and show a strong similarity to radiogenic crustal signatures in the juvenile Palaeoproterozoic crust of the Ketilidian mobile belt of southern Greenland. As previously proposed, an arc accretion event at c. 1.9 Ga triggered subduction-zone reversal and the development of an ensialic arc on the composite margin. After the subduction flip, a temporary release of compressive stress at c. 1.87 Ga led to the development of a retro-arc foreland basin on the downloaded Archean continental edge, forming the Aillik Group. Unlike previous models, a second arc is not envisaged. Instead, a compressive regime at c. 1.82 Ga is attributed to continued ensialic arc plutonism on the existing margin. The tectonic model for the Makkovikian orogeny proposed here is similar to that for the Ketilidian orogeny. Major- and trace-element analyses suggest that much of the magmatism in the Makkovik orogen results from post-accretionary ensialic arc activity, and that few vestiges remain of the original accreted volcanic arc. This pattern of arc accretion and intense post-accretion reworking is common to many accretionary orogens, such as the South American Andes and North American Cordillera.

Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 5 , May 2019 , pp. 833 - 848
Copyright
Copyright © Cambridge University Press 2018 

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