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- W1979373039 abstract "For a detailed analysis of their main structures (accumulation planes, foliation planes and lineations), the peridotite-gabbro units of Table Mountain and Blow-Me-Down Mountain, Bay-of-Islands, Newfoundland, have been divided into several structural units, each one being characterized by specific microstructures of deformation or accumulation. A fishbone pattern with the accumulation plane in the mafic cumulates dipping toward the ridge and the foliation plane in the ultramafic tectonites dipping away from it, is postulated for the structure of the lithosphere formed at a spreading center. The tectonic structures in the peridotites are related to asthenospheric flow in the uppermost mantle, and the direction of the ridge is inferred from the lineation trend in the peridotites. The structures in the cumulates are related to subsidence of the magma chamber floor during spreading. At the base of the massifs, the tectonic structures in the mafic metamorphic rocks are parallel to those observed. The latter have been deformed at moderate temperatures under high stresses and display mylonitic textures at their contact with the mafic tectonites. From these superimposed textures we infer a kinematic model for the oceanic thrusting of the lithosphere. The direction of thrusting is given by the lineation trend and its sense by the analysis of shear. All these data are combined into a paleogeographic scheme for the Newfoundland Caledonides." @default.
- W1979373039 created "2016-06-24" @default.
- W1979373039 creator A5001318995 @default.
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- W1979373039 date "1981-08-01" @default.
- W1979373039 modified "2023-10-17" @default.
- W1979373039 title "The structures of two ophiolite massifs, Bay-of-Islands, Newfoundland: A model for the oceanic crust and upper mantle" @default.
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- W1979373039 doi "https://doi.org/10.1016/0040-1951(81)90159-1" @default.
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