圣劳伦斯大陆架的倒塌:土卫二还是大西洋的开放?魁北克地区古应力重建的贡献(加拿大)

Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science Pub Date : 2001-08-15 DOI:10.1016/S1251-8050(01)01610-X

Muriel Rocher, Alain Tremblay

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引用次数: 10

摘要

圣劳伦斯低地对应于寒武纪-早奥陶世的Iapetus洋被动边缘，被阿巴拉契亚前陆的奥陶世沉积物覆盖。对魁北克市附近的台地进行了构造和古应力研究，重建了其古生代以来的构造演化。Iapetus边缘的塌陷(NW-SE伸展)诱发了N040正断层。阿巴拉契亚挤压(西西北向和南北向)重新激活了这些边界断层，并诱发了走向N090和N140的走滑断层。中生代NNE - NNW伸展作用使N090和N040断裂重新活化。以下NE-SW压缩一直活跃到今天。

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L'effondrement de la plate-forme du Saint-Laurent : ouverture de Iapetus ou de l'Atlantique ? Apport de la reconstitution des paléocontraintes dans la région de Québec (Canada)

The Saint-Lawrence Lowlands correspond to the Cambrian–Early Ordovician passive margin of the Iapetus Ocean, overlain by Ordovician deposits of the Appalachian foreland. A structural and palaeostress study of this platform near Quebec City allowed reconstructing its tectonic evolution since the Palaeozoic. The collapse of the Iapetus margin (NW–SE extension) has induced N040 normal faults. Appalachian compressions (WNW and north–south) have reactivated these border faults, and induced strike-slip faults trending N090 and N140. During the Mesozoic, NNE to NNW extensions have reactivated N090 and N040 faults. The following NE–SW compression has been active until today.

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Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science

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