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- W4313449260 abstract "Abstract The Sierras Pampeanas (27°–33°S) in South America are characterized by basementcored uplifts and shortening that occurs >500 km from the nearest convergent margin. The deformation correlates spatially and temporally with an area of flat-slab subduction of the Nazca plate in the last 10 m.y. We use two-dimensional thermal-mechanical models to study the dynamics of Pampean flat-slab subduction and the origin of the Sierras Pampeanas. Models examine a geological time from ca. 12 Ma to present day, during which time the Juan Fernández Ridge subducted beneath South America. Models show that the buoyant ridge triggers slab flattening, resulting in regional continental compression through end loading at the plate margin. Deformation in the continental interior depends on the inherited structure of the continent, where surface uplifts and shortening are concentrated at preexisting weak zones. The inboard migration of deformation is controlled by surface topography caused by the buoyant ridge rather than basal shear from the growing flat slab. Deformation occurs prior to the passage of the ridge and is inhibited when the ridge is beneath the region owing to dynamic uplift." @default.
- W4313449260 created "2023-01-06" @default.
- W4313449260 creator A5027381068 @default.
- W4313449260 creator A5074292548 @default.
- W4313449260 date "2022-12-20" @default.
- W4313449260 modified "2023-10-03" @default.
- W4313449260 title "Origin of the Sierras Pampeanas, Argentina: Flat-slab subduction and inherited structures" @default.
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- W4313449260 doi "https://doi.org/10.1130/g50551.1" @default.
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