Geoscience Canada

Volume 17, Number 4 (1990)
Articles

Late Archean geologic history of the Nain Province, North River-Nutak map area, Labrador, and its tectonic significance

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  • Martin J. Van Kranendonk,
  • Herwart Helmstaedt
Martin J. Van Kranendonk
Department of Geological Sciences, Queen's University, Kingston, Ontario.
Herwart Helmstaedt
Department of Geological Sciences, Queen's University, Kingston, Ontario.

Published 1990-12-12

How to Cite

Van Kranendonk, M. J., & Helmstaedt, H. (1990). Late Archean geologic history of the Nain Province, North River-Nutak map area, Labrador, and its tectonic significance. Geoscience Canada, 17(4). Retrieved from https://journals.lib.unb.ca/index.php/GC/article/view/3694
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Abstract

The high-grade gneisses of the Archean Nian Province were formed through Early and Late Archean orogenic cycles. Late Archean structural development consisted of pre-thermal-peak isoclinal folding and thrusting in allochthonous Upernavik supra-crustal rocks, followed by regional, recumbent, isoclinal folding and upright refolding of the Upernavik suite and reworked Early Archean gneisses under amphibolite- to granulite-facies conditions. Style and sequence of the Late Archean structures closely resemble those described by previous workers from the Early Archean gneiss complex of the North Atlantic craton, from Precambrian greenstone belts, and from Phanerozoic orogenic belts, suggesting that no principal differences exist in the structural evolution of these types of terrain.
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