The collapse of the Saint-Lawrence Platform: Iapetus or Atlantic opening? Insights from palaeostress reconstructions in the region of Quebec City (Canada)

Authors
Rocher, M Tremblay, A
Citation
M. Rocher et A. Tremblay, The collapse of the Saint-Lawrence Platform: Iapetus or Atlantic opening? Insights from palaeostress reconstructions in the region of Quebec City (Canada), CR AC S IIA, 333(3), 2001, pp. 171-178
Citations number
20
Categorie Soggetti
Earth Sciences
Journal title
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DELA TERRE ET DES PLANETES
ISSN journal
12518050 → ACNP
Volume
333
Issue
3
Year of publication
2001
Pages
171 - 178
Database
ISI
SICI code
1251-8050(20010815)333:3<171:TCOTSP>2.0.ZU;2-N
Abstract
The Saint-Lawrence Lowlands correspond to the Cambrian-Early Ordovician pas sive margin of the Iapetus Ocean, overlain by Ordovician deposits of the Ap palachian foreland. A structural and palaeostress study of this platform ne ar Quebec City allowed reconstructing its tectonic evolution since the Pala eozoic. The collapse of the Iapetus margin (NW-SE extension) has induced N0 40 normal faults. Appalachian compressions (WNW and north-south) have react ivated these border faults, and induced strike-slip faults trending N090 an d N140. During the Mesozoic, NNE to NNW extensions have reactivated N090 an d N040 faults. The following NE-SW compression has been active until today. (C) 2001 Academie des sciences / Editions scientifiques et medicales Elsev ier SAS.