Relief inversion triggered by subduction of an active spreading ridge: evidence from glacial morphology in Central Patagonia

Abstract : This study examines the response of the Central Patagonian Cordillera to the subduction of the active South Chile Ridge and the development of the asthenospheric slab window beneath Patagonia since the Pliocene. We investigated the eastern part of the Cordillera where the glacio-volcanic piedmont is topographically inverted. Glacial morphology and associated deposits capping the top of these piedmonts reveal that during the Pliocene (after 3 Ma), glaciers were flowing to the east over a regional surface connecting the western Cordillera and the palaeo-piedmont. N160-trending normal faulting along the western edge of the inverted plateau disrupted the geomorphic surface after 3 Ma. At a regional scale, extensional tectonics is responsible for a relief inversion with a minimum value of 800 m. The timing of extensional tectonics is contemporaneous with the subduction of the spreading axis and the development of the slab window beneath Central Patagonia.
Complete list of metadatas

https://hal.archives-ouvertes.fr/hal-00595547
Contributor : Gm Aigle <>
Submitted on : Wednesday, May 25, 2011 - 10:03:10 AM
Last modification on : Friday, April 5, 2019 - 8:24:02 PM

Links full text

Identifiers

Collections

Citation

Bruno Scalabrino, Jean-François Ritz, Yves Lagabrielle. Relief inversion triggered by subduction of an active spreading ridge: evidence from glacial morphology in Central Patagonia. Terra Nova, Wiley-Blackwell, 2011, 23 (2), pp.63-69. ⟨10.1111/j.1365-3121.2010.00981.x⟩. ⟨hal-00595547⟩

Share

Metrics

Record views

230