Subduction initiation at passive margins: the Scotian Basin, eastern Canada as a potential example
Article Abstract:
An analysis of the shear resistance associated lithospheric faulting and thermal evolution modeling show the difficulty of subduction initiation at passive margin. Pulses of compression related to plate reorganization may facilitate subduction initiation along a part of the margin by the deformation of strike slip and weaker continental lithosphere, the heating and weakening of oceanic lithosphere. Shear resistance is reduced when initiation is in an extensional or strike slip setting, the continents proximity to a mature passive margin is less, or when a passage of a mantle plume beneath the margin heats the continental lithosphere.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1993
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Evolution of retreating subduction boundaries formed during continental collision
Article Abstract:
Retreating subduction boundaries form in regions where continental collision occurs and where the rate of subduction is more than the rate of overall plate convergence. During such collisions, there is regional extension. The formation of retreating subduction boundaries in the early stages is by lateral ejection from crustal zones which shorten along the main collision boundary. The size and configuration of the deep water regions to be subducted cause differences in the duration of retreating subduction and evolution process.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1993
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Frozen subduction in Canada's Northwest Territories: Lithoprobe deep lithospheric reflection profiling of the western Canadian Shield
Article Abstract:
Seismic reflection images in the northwestern Canadian Shield reveal lithospheric structures to a depth of around 100 km in the area between the Archean Slave Province and the Cordillera. The data comes from the Lithoprobe Slave-Northern Cordillera Lithospheric Evolution (SNORCLE) transect, which aims to determine the nature of continental evolution from the Early Archean to Modern.
Publication Name: Tectonics
Subject: Earth sciences
ISSN: 0278-7407
Year: 1999
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