Title
Deciphering the Late Cretaceous-Cenozoic Structural Evolution of the North Peruvian Forearc System
Date Issued
01 January 2018
Access level
open access
Resource Type
journal article
Author(s)
Espurt N.
Brusset S.
Baby P.
Henry P.
Vega M.
Ramirez L.
Saillard M.
PERUPETRO S.A.
Publisher(s)
Blackwell Publishing Ltd
Abstract
The link between plate tectonics and the evolution of active margins is still an ongoing task to challenge since the acceptance of plate tectonic paradigm. This paper aims at deciphering the structural architecture and uplift history of the North Peruvian forearc system to better understand the evolution and the mechanics that govern the Late Cretaceous-Cenozoic building of this active margin. In this study, we report surface structural geology data, interpretation of seismic reflection profiles, apatite fission track data, and the construction of two offshore-onshore crustal-scale balanced cross sections. The structure of the North Peruvian forearc system is dominated by an accretionary style with northwestward propagation of thrust-related structural highs involving continental/oceanic basement rocks and off-scrapped sediments. The thrust systems bound thick thrust-top forearc depocenters mainly deformed by crustal normal to strike-slip faults and thin-skinned gravitational instabilities. The sequential restoration of the margin calibrated with apatite fission track data suggests a correlation between uplift, shortening, and plate convergence velocity during Late Cretaceous and Miocene. Pliocene-Quaternary shortening and uplift of the coastal zone is rather related to the subduction of asperities during convergence rate decrease. The development of crustal normal to strike-slip faulting and subsidence zones might be the consequence of slab flexure, local basal erosion along subduction fault, and/or oblique subduction associated with sediment loading control. We conclude that the evolution of the North Peruvian forearc system was controlled by subduction dynamics, strong sediment accumulation, and recent ridge subduction, and it recorded the orogenic loading evolution of the Andes over the Cenozoic.
Start page
251
End page
282
Volume
37
Issue
1
Language
English
OCDE Knowledge area
Geología Ingeniería arquitectónica
Scopus EID
2-s2.0-85041063299
Source
Tectonics
ISSN of the container
02787407
Sponsor(s)
This work was conducted thanks to the Institut de Recherche pour le Développement (IRD)-PERUPETRO S.A. research agreement. Financial support for field work and analysis came from IRD (UR 234), CEREGE (internal research grant: Characterization and quantifica tion of the deformations in a complex compressional basin: the Tumbes-Talara forearc basin, North Peru), and the Institut Carnot ISIFoR (Research project: Structural modeling and petroleum simulations in complex zones: insight into the giant petroleum field of the Nord Peruvian forearc). Midland Valley Inc. is acknowledged for providing academic license of Move for structural modeling. We acknowledge the Associate Editor Augusto Rapalini, Agustin Cardona, and an anonymous reviewer for the constructive comments which greatly helped us to improve our manuscript. Supporting data are included in supporting information or available by contacting the corresponding author (espurt@cerege.fr).
Sources of information: Directorio de Producción Científica Scopus