Western thrusting and uplift in northern Central Andes (western Peruvian margin)

Alice Prudhomme, Patrice Baby, Alexandra Robert, Stéphanie Brichau, Edward Cuipa, Adrien Eude, Ysabel Calderon, Paul O’Sullivan

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

16 Scopus citations


Tectonostratigraphic revision and a crustal balanced cross-section of the northern Peruvian margin show that the Western Andean Escarpment and the Calipuy Plateau-Basin topographic features are related to a major west-verging basement thrust: the Western Andean Escarpment Thrust (WAET). Thermochronological data through the Coastal Batholith display a regional exhumation since at least 29Ma and a step-change pattern in the cooling ages that we partly attribute to the WAET activation. Thermal modeling shows higher exhumation rates (~170-270m/Myr) between 12 and 8Ma, due to the onset of the Nazca Ridge subduction. This regional offshore-onshore study allows as well to unravel the Paleogene-Neogene complex tectonic evolution of the northern Peruvian Andes: (1) a middle Eocene regional erosion (~41Ma) erasing the Incaic orogen nowadays partially preserved in the Western Cordillera and in the offshore Trujillo-Salaverry basins; (2) a late Eocene to early Oligocene postorogenic relaxation and extension (Yaquina and Trujillo basins); (3) the westward WAET propagation and a ~150km eastward jump of the double verging Andean orogen since the late Oligocene.

Original languageEnglish
Title of host publicationAndean Tectonics
PublisherElsevier Inc.
Number of pages33
ISBN (Electronic)9780128160091
ISBN (Print)9780128160107
StatePublished - 1 Jan 2019
Externally publishedYes


  • Balanced cross-section
  • Calipuy Plateau-Basin
  • Forearc basins
  • Middle Eocene erosion
  • Northern Central Andes
  • Peru
  • Thermochronology
  • Western Andean Escarpment


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