Skip to Main content Skip to Navigation
Journal articles

Slab flattening, magmatism, and surface uplift in the Cordillera Occidental (northern Peru)

Abstract : The impact of subduction processes on surface uplift and relief building in the Andes is not well understood. In northern Peru, we have access to a modern flat subduction zone (3°–15°S) where both the geometry and timing of the flattening of the slab are well constrained. Some of the highest Andean peaks, the Cordillera Blanca (6768 m) and the Cordillera Negra (5187 m), are located just above the Peruvian flat slab. This is a perfect target to explore the impact of slab flattening and associated magmatism on Andean topography and uplift. We present new apatite (U-Th)/He and fission-track data from three vertical profiles in the Cordillera Blanca and the Cordillera Negra. Time-temperature inverse modeling of the thermochronologi-cal data suggests that regional exhumation in the Cordillera Occidental started at ca. 15 Ma, synchronous with the onset of subduction of the Nazca Ridge and eastward movement of regional magmatism. We propose that ridge subduction at 15 Ma and onset of slab flattening drove regional surface uplift, with an important contribution of mag-matism to relief building in the Cordillera Occidental.
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-01677064
Contributor : Audrey Margirier <>
Submitted on : Friday, February 16, 2018 - 4:01:29 PM
Last modification on : Wednesday, September 16, 2020 - 5:00:59 PM
Long-term archiving on: : Wednesday, May 2, 2018 - 1:13:16 PM

File

Margirier-et-al-2015-geology-H...
Files produced by the author(s)

Identifiers

Citation

Audrey Margirier, Xavier Robert, Laurence Audin, Cécile Gautheron, Matthias Bernet, et al.. Slab flattening, magmatism, and surface uplift in the Cordillera Occidental (northern Peru). Geology, Geological Society of America, 2015, 43 (11), pp.1031-1034. ⟨10.1130/G37061.1⟩. ⟨insu-01677064⟩

Share

Metrics

Record views

246

Files downloads

401