Southward extrusion tectonics during the Carboniferous Africa-North America collision

Vauchez, Alain; Kessler, S.F; Lécorché, J. P.; Villeneuve, Michel

doi:10.1016/0040-1951(87)90130-2

Cited by 22 publications

(10 citation statements)

References 21 publications

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“…These authors tentatively associated this paleostress rotation with the gradual indentation of Gondwana's Reguibat uplift into Laurentia during the Carboniferous (Fig. 2) (Lefort et al, 1988;Vauchez et al, 1987;Piqué and Skehan, 1992).…”

Section: Synopsis and Interpretation Of Alleghanian Structures In Thementioning

confidence: 91%

Alleghanian deformation in the eastern Gaspé Peninsula of Quebec, Canada

Jutras

Prichonnet

McCutcheon³

2003

Geo. Society Am. Bull.

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Juxtaposition of the Mississippian Ristigouche and Cannes-de-Roches Basins, which are subbasins of the composite late Paleozoic Maritimes Basin, occurred through dextral movement along the northwest-striking Percé Fault system in the eastern Gaspé Peninsula of Quebec. The northwest-striking faults are truncated by small north-northwest-striking dextral strike-slip faults, which probably developed as regional stress gradually rotated clockwise from north-northwest-south-southeast to northeast-southwest. This study provides the first evidence in eastern Quebec for significant post-Acadian block displacement other than normal faulting and indicates that Alleghanian deformation extended much farther north than previously thought. Identification of these structures formed during the Alleghanian orogeny but more than 1000 km away from areas of peak Alleghanian metamorphism in the southeastern United States underlines the far-reaching effects of continental collisions. It also casts doubt on the age attribution of brittle strike-slip faults elsewhere in the Gaspé Peninsula, away from Mississippian exposures. Such brittle faults were previously associated with late stages of the Acadian orogeny but could in fact be considerably younger.

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Section: Synopsis and Interpretation Of Alleghanian Structures In Thementioning

confidence: 91%

Alleghanian deformation in the eastern Gaspé Peninsula of Quebec, Canada

Jutras

Prichonnet

McCutcheon³

2003

Geo. Society Am. Bull.

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“…Similar reactivation has not been documented on other Alleghanian faults in the Appalachians. Vauchez et al (1987) attempted to model the collision of the Reguibat indenter as a mirror image of the Tapponier et al (1982) extrusion tectonics model for the Himalayan region, but did not take into account the rotational component or the general southwestward transport of all blocks, both north and south of the indenter.…”

Section: Alleghanian Deformation Sequencementioning

confidence: 99%

Alleghanian (Appalachian) orogeny, a product of zipper tectonics: Rotational transpressive continent-continent collision and closing of ancient oceans along irregular margins

Hatcher¹

2002

Variscan-Appalachian Dynamics: The Building of the Late Paleozoic Basement

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“…If the possible link with the North American lineaments is considered, then the combined Tibesti-Cabot Strait-Chesterfield Inlet megalineament system, extending across 9000 km of Pangaea, must have had an origin in some process active during the existence of Pangaea, i.e., from the late Palaeozoic to the late Mesozoic (Scotese and Sager, 1988). One of the most likely processes would have been the collision between North America and northwest Africa in the Carboniferous, during which considerable strike-slip extrusion tectonics resulted in the southward escape of terranes in northwest Africa (Vauchez et al, 1987;Villeneuve and Dallmeyer, 1988). During this process, the east-northeast to west-southwest-trending Taoudeni Lineament (Guiraud et al, 2000) may have formed.…”

Section: Lithospheric Tectonics and The Origin Of Pangaean Lineamentsmentioning

confidence: 99%

Pangaean megalineaments: geophysical indications for the existence of Laurentian counterparts of the 6000 km Trans-Saharan Tibesti Lineament, and implications for lithospheric tectonics and mineral deposits

Master

2006

South African Journal of Geology

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A major 6000-km long west-northwest to east-southeast-trending Trans-Saharan lineament, extending from Kenya to Morocco, referred to as the Tibesti Lineament, has been described by Guiraud et al. (2000). This lineament shows up on satellite images, air-photo mosaics and terrain elevation models, as swarms of parallel faults. It corresponds to a major discontinuity of surface wave velocities in the mantle, suggesting that it deeply affects the lithosphere. The highest heat flow measurements in the West African shield are found adjacent to the Tibesti Lineament in the northern Hoggar uplift. Geophysical, geological, and geomorphological evidence suggests that the Tibesti lineament may have continued into North America (Laurentia), which collided with northwest Africa during the Appalachian-Mauritanide orogeny, coinciding with the late Palaeozoic assembly of the supercontinent Pangaea. The contiguous Laurentian lineaments which may be extensions of the Tibesti Lineament, are the here newly recognised Chesterfield Inlet Lineament and the Cabot Strait Lineament, both of which are situated in Canada. These lineaments are defined as linear pattern breaks in processed aeromagnetic anomaly maps of Canada. Some portions of them also can be detected in refraction and reflection seismic survey data (e.g., under Hudon Bay), and to a lesser extent, in the Bouguer gravity anomaly map of Canada. The lineaments have present-day (neotectonic) surface expressions in the form of inlets, submarine channels, straight river segments, and strings of linear lakes, extending over 3700 km, from Nunavut Province northwest of Hudson Bay, across Quebec and Newfoundland, and to the Cabot Strait separating Newfoundland from Nova Scotia. The highest heat flow in the Canadian Maritimes is found in the Cabot Strait. The Tibesti-Cabot-Strait-Chesterfield Inlet lineaments reflect deep-seated fracturing of the North African and North American lithosphere, involving both the crust and rigid upper mantle. These lineaments cut right across the grain of numerous orogenic belts dating from the Palaeoproterozoic, Late Mesoproterozoic, and Palaeozoic. By analogy with other largetranscontinental lineaments which contain ore deposits, these newly identified megalineaments may be prospective for economic mineral deposits, such as hydrothermal gold and base metal mineralization, and diamondiferous kimberlites.

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Southward extrusion tectonics during the Carboniferous Africa-North America collision

Cited by 22 publications

References 21 publications

Alleghanian deformation in the eastern Gaspé Peninsula of Quebec, Canada

Alleghanian deformation in the eastern Gaspé Peninsula of Quebec, Canada

Alleghanian (Appalachian) orogeny, a product of zipper tectonics: Rotational transpressive continent-continent collision and closing of ancient oceans along irregular margins

Pangaean megalineaments: geophysical indications for the existence of Laurentian counterparts of the 6000 km Trans-Saharan Tibesti Lineament, and implications for lithospheric tectonics and mineral deposits

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