Geology of the Archean Nain Province and Paleoproterozoic Torngat Orogen in a transect of the North River-Nutak map areas, Newfoundland (Labrador) and Quebec

E. Ermanovics, Martin Van Kranendonk

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The report, based on 1:100 000 scale bedrock mapping, describes the lithology, structure, metamoprhism, geochronology, economic geology, and some geophysical characteristics of the Archean Nain Province in the east and the adjacent, early Proterozoic Torngat orogen of Churchill (Rae) Province in the west. Nain Province is underlain by mainly granulite/amphibolite facies, migmatitic orthogneisses, and minor remnants of supracrustal and basic igenous rocks up to 3.6 Ga old. The province formed by the amalgamation of at least two terranes, after 2.7 Ga, resulting in widespread crustal reactivation at ca. 2.56 Ga. Discrete events in the early Proterozoic, granulite facies Torngat orogen include collision with Nain Province and crustal thickening (ca. 1860 Ma), strike-slip shear/transpression (ca. 1845-1822 Ma), and reactivation and uplift (ca. 1790-1780 Ma). The precollisional configuration of units in the orogen immediately west of Nain Province includes the protoliths of the Tasiuyak gneiss on the margin of Churchill (Rae) Province, probably as an east-facing accretionary prism intruded by calc-alkaline plutonic rocks of a magmatic are ca. 1880 Ma. The orogeny transgressed eastward into Nain Province, reworking Archean gneisses and deforming the supracrustal Paleoproterozoic Ramah Group in an amphibolite facies foreland. The effects of orogeny extend 70 km east of this foreland, to the coastal reaches of Nain Province, mainly in the form of a metamorphic waning to lower greenschist faces, affecting early Paleoproterozoic tholeiitic diabase dykes and the volcanic and sedimentary rocks of the Mugford Group.

Original languageEnglish
JournalBulletin - Geological Survey of Canada
Volume497
Publication statusPublished - Jan 1 1998
Externally publishedYes

Fingerprint

Archean
transect
geology
river
amphibolite facies
reactivation
orogeny
Proterozoic
economic geology
province
transpression
alkaline rock
greenschist
crustal thickening
plutonic rock
accretionary prism
granulite
granulite facies
diabase
protolith

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

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title = "Geology of the Archean Nain Province and Paleoproterozoic Torngat Orogen in a transect of the North River-Nutak map areas, Newfoundland (Labrador) and Quebec",
abstract = "The report, based on 1:100 000 scale bedrock mapping, describes the lithology, structure, metamoprhism, geochronology, economic geology, and some geophysical characteristics of the Archean Nain Province in the east and the adjacent, early Proterozoic Torngat orogen of Churchill (Rae) Province in the west. Nain Province is underlain by mainly granulite/amphibolite facies, migmatitic orthogneisses, and minor remnants of supracrustal and basic igenous rocks up to 3.6 Ga old. The province formed by the amalgamation of at least two terranes, after 2.7 Ga, resulting in widespread crustal reactivation at ca. 2.56 Ga. Discrete events in the early Proterozoic, granulite facies Torngat orogen include collision with Nain Province and crustal thickening (ca. 1860 Ma), strike-slip shear/transpression (ca. 1845-1822 Ma), and reactivation and uplift (ca. 1790-1780 Ma). The precollisional configuration of units in the orogen immediately west of Nain Province includes the protoliths of the Tasiuyak gneiss on the margin of Churchill (Rae) Province, probably as an east-facing accretionary prism intruded by calc-alkaline plutonic rocks of a magmatic are ca. 1880 Ma. The orogeny transgressed eastward into Nain Province, reworking Archean gneisses and deforming the supracrustal Paleoproterozoic Ramah Group in an amphibolite facies foreland. The effects of orogeny extend 70 km east of this foreland, to the coastal reaches of Nain Province, mainly in the form of a metamorphic waning to lower greenschist faces, affecting early Paleoproterozoic tholeiitic diabase dykes and the volcanic and sedimentary rocks of the Mugford Group.",
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