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A revised model for the crustal structure of the SW Grenville Province, Ontario, Canada

Published online by Cambridge University Press:  16 March 2017

ALAN DICKIN ,
JACOB STRONG ,
GABRIEL ARCURI ,
ANNIKA VAN KESSEL  and
LUCIA KRIVANKOVA-SMAL
ALAN DICKIN*
Affiliation:
School of Geography & Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M2, Canada
JACOB STRONG
Affiliation:
School of Geography & Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M2, Canada
GABRIEL ARCURI
Affiliation:
School of Geography & Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M2, Canada
ANNIKA VAN KESSEL
Affiliation:
School of Geography & Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M2, Canada
LUCIA KRIVANKOVA-SMAL
Affiliation:
School of Geography & Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M2, Canada
*
*Author for correspondence: [email protected]
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Abstract

The Grenville Province forms the exhumed remnants of a 1.1 Ga collisional orogeny that telescoped an older continental margin. Terranes with distinct crustal formation ages can be mapped using Nd isotopes, revealing a ramp–flat thrust structure. The ramp is identified by the presence of retrogressed eclogites, and its trajectory is refined using Nd model ages. The main allochthon is locally overlain by the Parry Sound klippe, but is also underlain by a tectonic duplex. Northwest-directed nappes represent remnants of a corrugated thrust sheet, but a ring-shaped remnant was also preserved where the thrust sheet was down-buckled under the dense rocks of Parry Sound domain.

Keywords

Nd isotope mappingNd model agescrustal formationramp-flat thrusting
Type
Rapid Communication
Information
Geological Magazine , Volume 154 , Issue 4 , July 2017 , pp. 903 - 913
Copyright
Copyright © Cambridge University Press 2017 

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