Mass Balance of Cenozoic Andes-Amazon Source to Sink System—Marañón Basin, Peru

Gérôme Calvès (1) , Ysabel Calderon , Christian Hurtado Enriquez (2) , Stéphane Brusset (3) , William Santini (1) , Patrice Baby (3)

1 GET - Géosciences Environnement Toulouse
2 UnB - Universidade de Brasilia [Brasília]
3 LMTG - Laboratoire des Mécanismes et Transfert en Géologie

We investigate the mass balance of the Cenozoic Andes-Amazon source to sink system using rock uplift proxies and solid sedimentation of the Marañón Basin in Peru. The evolution of sedimentation rates is calibrated with regional structural restored cross-section. The quantification of eroded sediments from reliefs to sedimentary basin is achieved with ×10 Myr resolution and compared to present day proxies from the HYBAM (HYdrologie et Biogéochimie du Bassin Amazonien) Critical Zone Observatory. Erosion of the early Andean landforms started during the Upper Mesozoic period, but sediment rates significantly increase during the Neogene. This is in agreement with the calibrated increase of rock uplift in the Andean orogenic belt.

Mots clés: source to sink; mass balance; erosion; sedimentation rate; Andes; Peru; Marañón Basin; Cenozoic

Domaines: Stratigraphie; Géomorphologie; Tectonique; Interfaces continentales, environnement

Gérôme Calvès, Ysabel Calderon, Christian Hurtado Enriquez, Stéphane Brusset, William Santini, et al.. Mass Balance of Cenozoic Andes-Amazon Source to Sink System—Marañón Basin, Peru. Geosciences, 2018, 8 (5), pp.167. ⟨10.3390/geosciences8050167⟩. ⟨hal-01787548⟩