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- W169637051 abstract "Geophysical studies have made a fundamental contribution to the recognition of plate tectonics as a key mechanism in the evolution of the Canadian Shield and simultaneously have promoted the viability of Precambrian plate tectonics. Paleomagnetic studies, though limited by a lack of resolution and often controversial, suggest that large-scale displacements of now contiguous terranes had occurred, thereby stimulating the search for appropriate sutures. Distinctive gravity signatures pointed to the presence of deep crustal breaks along boundaries between structural provinces, and seismic studies indicated differences in crustal thickness on either side. The breaks were interpreted as collisional sutures, supporting evidence for which included juxtaposition of sedimentary facies typical of passive continental margins with mafic igneous rocks interpreted as oceanic crust, and a marked contrast in ages and structural characteristics across the proposed sutures. Further support was provided by geologically recent analogues such as the Peruvian Andes, Zagros suture zone, and India/Tibet collision. Compelling evidence for plate collision comes from the Cape Smith Belt, where ophiolitic thrust sheets complete with a diagnostic sheeted dike complex and representing the oldest known example (1998 Ma) of oceanic crust in North America were recently identified. Geophysical transects across several suture zones provide insights into the large-scale crustal morphology of sutured margins. Examples include the Grenville Front, Labrador Trough, Cape Smith Belt, and Wopmay Orogen." @default.
- W169637051 created "2016-06-24" @default.
- W169637051 creator A5077591623 @default.
- W169637051 date "1992-01-01" @default.
- W169637051 modified "2023-10-17" @default.
- W169637051 title "Ancient collisional continental margins in the Canadian Shield: Geophysical signatures and derived crustal transects" @default.
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- W169637051 doi "https://doi.org/10.1007/978-94-011-1614-5_2" @default.
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