Prolonged extension and subsidence of the Peruvian forearc during the Cenozoic

Viveen, Willem; Schlunegger, Fritz (2018). Prolonged extension and subsidence of the Peruvian forearc during the Cenozoic. Tectonophysics, 730, pp. 48-62. Elsevier 10.1016/j.tecto.2018.02.018

[img] Text
Viveen_Schlunegger.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (3MB) | Request a copy

Ocean-continental subduction zones are commonly associated with compressional stress fields, which ultimately result in regional uplift of the overriding plate. This has particularly been inferred by most studies for the western margin of the Peruvian Andes. However, local geological observations have contested this idea. Here, we present a review of existing local and international literature supplemented by new structural and geomorphic observations that suggest that nearly the entire central (15° to 11° S latitude) and northern Peruvian forearc (11° to 6° S latitude) are under extension with a slight tendency to transtension instead of compression, and that this region has experienced a prolonged period of subsidence since the middle-late Eocene, interrupted by short pulses of uplift. In contrast, the southern Peruvian forearc (15° to 18° S latitude) has experienced (trans)tension from the middle-late Eocene until recent in combination with uplift. The central and southern Peruvian forearc that was influenced by the passage of the Nazca ridge experienced transtension and subsidence until the middle-late Miocene and alternating phases of compressional and transtensional tectonics afterwards. These new findings on the geodynamic development of the Peruvian forearc need to be considered in future reconstructions of the mechanisms at work within this subduction zone.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Schlunegger, Fritz

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0040-1951

Publisher:

Elsevier

Language:

English

Submitter:

Fritz Schlunegger

Date Deposited:

07 May 2018 14:57

Last Modified:

26 Oct 2019 00:58

Publisher DOI:

10.1016/j.tecto.2018.02.018

BORIS DOI:

10.7892/boris.112560

URI:

https://boris.unibe.ch/id/eprint/112560

Actions (login required)

Edit item Edit item
Provide Feedback