(Un)Coupled thrust belt-foreland deformation in the northern Patagonian Andes: New insights from the Esquel-Gastre sector (41°30'-43°S)

E. Savignano , S. Mazzoli , M. Arce , M. Franchini , C. Gautheron (1) , M. Paolini , M. Zattin

1 GEOPS - Géosciences Paris Saclay

The Patagonian Andes represents a unique natural laboratory to study surface deformation in relation to deep slab dynamics. In the sector comprised between latitudes 41°30' and 43°S, new apatite (U-Th)/He ages indicate a markedly different unroofing pattern between the "broken foreland" area (characterized by Late Cretaceous to Paleogene exhumation) and the adjacent Andean sector to the west, which is dominated by Miocene-Pliocene exhumation. These unroofing stages can be confidently ascribed to inversion tectonics involving reverse fault-related uplift and concomitant erosion. Late Cretaceous-Paleogene shortening and exhumation are well known to have affected also the thrust belt sector of the study area during a prolonged stage of flat-slab subduction. Therefore, the different ages of near-surface unroofing documented in this study suggest coupling of the deformation between the thrust belt and its foreland during periods of flat-slab subduction (e.g., during Late Cretaceous-Paleogene times) and dominant uncoupling during periods of steep-slab subduction and rollback, even when these are associated with high convergence rates (i.e., > 4 cm/yr), as those documented in Miocene times for the Patagonian Andes.

Mots clés: Patagonia; low-temperature thermochronology; exhumation; AHe dating; broken foreland; Chubut

Domaines: Planète et Univers [physics]; Tectonique

E. Savignano, S. Mazzoli, M. Arce, M. Franchini, C. Gautheron, et al.. (Un)Coupled thrust belt-foreland deformation in the northern Patagonian Andes: New insights from the Esquel-Gastre sector (41°30'-43°S). Tectonics, 2016, 35, pp.2636-2656. ⟨10.1002/2016TC004225⟩. ⟨insu-03745247⟩