The palaeoproterozoic Southeastern Churchill Province of Labrador-Quebec, Canada: Orogenic development as a consequence of oblique collision and indentation

R. J. Wardle, Martin Van Kranendonk

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Palaeoproterozoic orogenic development in the northeastern Canadian Shield was controlled by the successive, oblique collision of the Archaean Nain (North Atlantic) and Superior cratons with a southwards projecting promontory of the Archaean Rae Province (part of the northern Churchill Province hinterland). By this process the Rae Province became sutured to the Nain craton by the Torngat Orogen and to the Superior craton by the New Quebec Orogen, resulting in the formation of a 400 km wide orogenic belt known as the Southeastern Churchill Province (SECP). Initial rifting at 2.45-2.1 Ga, and early (arc?) magmatism and deformation at 2.3-1.9 Ga, were restricted to the Rae Province. They were followed by arc magmatism in the Torngat Orogen at c. 1.91-1.88 Ga and Rae\Nain collision 1.87-1.86 Ga, which resulted in the formation of an orogen with east- and west-verging structures. Arc magmatism in the New Quebec Orogen commenced at c. 1.845 Ga and was succeeded by Rae\Superior collision and widespread deformation across the SECP at c. 1.83 Ga. Deformation at this time was dominated by west-vergent thrusting in the New Quebec Orogen and Rae Province, and by renewed east-vergent thrusting in Torngat Orogen. Deformation was then progressively transferred to major sinistral (1.845-1.82 Ga in the eastern SECP) and dextral (1.83-1.80 Ga? in the western SECP) shear systems that accommodated continued northwards motion of the Nain and Superior cratons relative to the Rae Province. Juvenile crust expelled by thrusting effectively doubled crustal thickness in parts of the Rae Province and the northwestern edge of the Nain craton. Late stage development (1.8-1.71 Ga), was restricted to the margins of the SECP, where deformation was associated with renewed outward-directed overthrusting and transcurrent shear in conjunction with uplift of the orogenic core.

Original languageEnglish
Pages (from-to)137-153
Number of pages17
JournalGeological Society Special Publication
Volume112
DOIs
Publication statusPublished - Dec 1 1996
Externally publishedYes

Fingerprint

indentation
Indentation
collision
craton
magmatism
province
Archean
crustal thickness
orogenic belt
rifting
shield
uplift

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Geology

Cite this

@article{5018f16f6a4c4dc49b9d1008f292ac05,
title = "The palaeoproterozoic Southeastern Churchill Province of Labrador-Quebec, Canada: Orogenic development as a consequence of oblique collision and indentation",
abstract = "Palaeoproterozoic orogenic development in the northeastern Canadian Shield was controlled by the successive, oblique collision of the Archaean Nain (North Atlantic) and Superior cratons with a southwards projecting promontory of the Archaean Rae Province (part of the northern Churchill Province hinterland). By this process the Rae Province became sutured to the Nain craton by the Torngat Orogen and to the Superior craton by the New Quebec Orogen, resulting in the formation of a 400 km wide orogenic belt known as the Southeastern Churchill Province (SECP). Initial rifting at 2.45-2.1 Ga, and early (arc?) magmatism and deformation at 2.3-1.9 Ga, were restricted to the Rae Province. They were followed by arc magmatism in the Torngat Orogen at c. 1.91-1.88 Ga and Rae\Nain collision 1.87-1.86 Ga, which resulted in the formation of an orogen with east- and west-verging structures. Arc magmatism in the New Quebec Orogen commenced at c. 1.845 Ga and was succeeded by Rae\Superior collision and widespread deformation across the SECP at c. 1.83 Ga. Deformation at this time was dominated by west-vergent thrusting in the New Quebec Orogen and Rae Province, and by renewed east-vergent thrusting in Torngat Orogen. Deformation was then progressively transferred to major sinistral (1.845-1.82 Ga in the eastern SECP) and dextral (1.83-1.80 Ga? in the western SECP) shear systems that accommodated continued northwards motion of the Nain and Superior cratons relative to the Rae Province. Juvenile crust expelled by thrusting effectively doubled crustal thickness in parts of the Rae Province and the northwestern edge of the Nain craton. Late stage development (1.8-1.71 Ga), was restricted to the margins of the SECP, where deformation was associated with renewed outward-directed overthrusting and transcurrent shear in conjunction with uplift of the orogenic core.",
author = "Wardle, {R. J.} and {Van Kranendonk}, Martin",
year = "1996",
month = "12",
day = "1",
doi = "10.1144/GSL.SP.1996.112.01.08",
language = "English",
volume = "112",
pages = "137--153",
journal = "Geological Society Special Publication",
issn = "0305-8719",
publisher = "Geological Society of London",

}

TY - JOUR

T1 - The palaeoproterozoic Southeastern Churchill Province of Labrador-Quebec, Canada

T2 - Orogenic development as a consequence of oblique collision and indentation

AU - Wardle, R. J.

AU - Van Kranendonk, Martin

PY - 1996/12/1

Y1 - 1996/12/1

N2 - Palaeoproterozoic orogenic development in the northeastern Canadian Shield was controlled by the successive, oblique collision of the Archaean Nain (North Atlantic) and Superior cratons with a southwards projecting promontory of the Archaean Rae Province (part of the northern Churchill Province hinterland). By this process the Rae Province became sutured to the Nain craton by the Torngat Orogen and to the Superior craton by the New Quebec Orogen, resulting in the formation of a 400 km wide orogenic belt known as the Southeastern Churchill Province (SECP). Initial rifting at 2.45-2.1 Ga, and early (arc?) magmatism and deformation at 2.3-1.9 Ga, were restricted to the Rae Province. They were followed by arc magmatism in the Torngat Orogen at c. 1.91-1.88 Ga and Rae\Nain collision 1.87-1.86 Ga, which resulted in the formation of an orogen with east- and west-verging structures. Arc magmatism in the New Quebec Orogen commenced at c. 1.845 Ga and was succeeded by Rae\Superior collision and widespread deformation across the SECP at c. 1.83 Ga. Deformation at this time was dominated by west-vergent thrusting in the New Quebec Orogen and Rae Province, and by renewed east-vergent thrusting in Torngat Orogen. Deformation was then progressively transferred to major sinistral (1.845-1.82 Ga in the eastern SECP) and dextral (1.83-1.80 Ga? in the western SECP) shear systems that accommodated continued northwards motion of the Nain and Superior cratons relative to the Rae Province. Juvenile crust expelled by thrusting effectively doubled crustal thickness in parts of the Rae Province and the northwestern edge of the Nain craton. Late stage development (1.8-1.71 Ga), was restricted to the margins of the SECP, where deformation was associated with renewed outward-directed overthrusting and transcurrent shear in conjunction with uplift of the orogenic core.

AB - Palaeoproterozoic orogenic development in the northeastern Canadian Shield was controlled by the successive, oblique collision of the Archaean Nain (North Atlantic) and Superior cratons with a southwards projecting promontory of the Archaean Rae Province (part of the northern Churchill Province hinterland). By this process the Rae Province became sutured to the Nain craton by the Torngat Orogen and to the Superior craton by the New Quebec Orogen, resulting in the formation of a 400 km wide orogenic belt known as the Southeastern Churchill Province (SECP). Initial rifting at 2.45-2.1 Ga, and early (arc?) magmatism and deformation at 2.3-1.9 Ga, were restricted to the Rae Province. They were followed by arc magmatism in the Torngat Orogen at c. 1.91-1.88 Ga and Rae\Nain collision 1.87-1.86 Ga, which resulted in the formation of an orogen with east- and west-verging structures. Arc magmatism in the New Quebec Orogen commenced at c. 1.845 Ga and was succeeded by Rae\Superior collision and widespread deformation across the SECP at c. 1.83 Ga. Deformation at this time was dominated by west-vergent thrusting in the New Quebec Orogen and Rae Province, and by renewed east-vergent thrusting in Torngat Orogen. Deformation was then progressively transferred to major sinistral (1.845-1.82 Ga in the eastern SECP) and dextral (1.83-1.80 Ga? in the western SECP) shear systems that accommodated continued northwards motion of the Nain and Superior cratons relative to the Rae Province. Juvenile crust expelled by thrusting effectively doubled crustal thickness in parts of the Rae Province and the northwestern edge of the Nain craton. Late stage development (1.8-1.71 Ga), was restricted to the margins of the SECP, where deformation was associated with renewed outward-directed overthrusting and transcurrent shear in conjunction with uplift of the orogenic core.

UR - http://www.scopus.com/inward/record.url?scp=2242429220&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2242429220&partnerID=8YFLogxK

U2 - 10.1144/GSL.SP.1996.112.01.08

DO - 10.1144/GSL.SP.1996.112.01.08

M3 - Article

AN - SCOPUS:2242429220

VL - 112

SP - 137

EP - 153

JO - Geological Society Special Publication

JF - Geological Society Special Publication

SN - 0305-8719

ER -