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The subduction of bathymetric highs such as aseismic ridges, oceanic plateaus, and seamounts has been posited as the primary driver of flat slab subduction. [3] The Andean flat slab subduction zones, the Peruvian slab and the Pampean (Chilean) flat slab, are spatially correlated with the subduction of bathymetric highs, the Nazca Ridge and the Juan Fernandéz Ridge, respectively.
Low angle subduction or flat-slab subduction has been common during the Andean orogeny leading to crustal shortening and deformation and the suppression of arc volcanism. Flat-slab subduction has occurred at different times in various part of the Andes, with northern Colombia (6–10° N), Ecuador (0–2° S), northern Peru (3–13° S) and ...
The volcanic arc has formed due to subduction of the Nazca plate under western South America along the Peru–Chile Trench. To the south, the CVZ is limited by the Pampean flat-slab segment or Norte Chico flat-slab segment, a region devoid of volcanism due to a lower subduction angle caused by the subduction of Juan Fernández Ridge.
The subducting Nazca plate, which exhibits unusual flat slab subduction, is tearing as well as deforming as it is subducted (Barzangi and Isacks). The subduction has formed and continues to form the volcanic Andes Mountain Range. Deformation of the Nazca plate even affects the geography of Bolivia, far to the east (Tinker et al.).
Sierras Pampeanas, extra-Andean mountains uplifted by the Pampean flat-slab in the Neogene and Quaternary epochs. The Pampean flat-slab is the low angle subduction of oceanic lithosphere beneath Northern Argentina. The Pampean flat-slab is one of three flat slabs in South America, the other being the Peruvian flat-slab and the Bucaramanga flat ...
The flat slab subduction associated with the Nazca Ridge has been linked to the cessation of volcanism in the Andes Mountains at about 4 Ma. [6] The subduction has also been linked with the formation of the Fitzcarrald Arch, which is a 400,000 km 2 (150,000 sq mi), 400 to 600 m (1,300 to 2,000 ft) high, domed topographic feature that defines ...
There are two areas of flat slab subduction of the Nazca Plate in Chile and Peru [15] along the Peruvian subduction system - the Peruvian flat slab segment and Pampean flat slab segment. The length of the subduction zone is represented by the Peru–Chile Trench. These regions of flat slab subduction have been modelled to result in dynamic ...
Flat-slab subduction is ongoing beneath part of the Andes, causing segmentation of the Andean Volcanic Belt into four zones. The flat-slab subduction in northern Peru and the Norte Chico region of Chile is believed to be the result of the subduction of two buoyant aseismic ridges, the Nazca Ridge and the Juan Fernández Ridge, respectively