Document Type
Article
Publication Date
9-1-2021
Publication Title
Basin Research
Publisher
Wiley
Volume
33
Issue
6
First page number:
3406
Last page number:
3437
Abstract
Central Argentina from the Pampean flat-slab segment to northern Patagonia (27°–41°S) represents a classic example of a broken retroarc basin with strong tectonic and climatic control on fluvial sediment transport. Combined with previous research focused on coastal sediments, this actualistic provenance study uses framework petrography and heavy-mineral data to trace multistep dispersal of volcaniclastic detritus first eastwards across central Argentina for up to ca. 1,500 km and next northwards for another 760 km along the Atlantic coast. Although detritus generated in the Andes is largely derived from mesosilicic volcanic rocks of the cordillera, its compositional signatures reflect different tectono-stratigraphic levels of the orogen uplifted along strike in response to varying subduction geometry as well as different character and crystallization condition of arc magmas through time and space. River sand, thus, changes from feldspatho-litho-quartzose or litho-feldspatho-quartzose in the north, where sedimentary detritus is more common, to mostly quartzo-feldspatho-lithic in the centre and to feldspatho-lithic in the south, where volcanic detritus is dominant. The transparent-heavy-mineral suite changes markedly from amphibole... (See full abstract in article).
Keywords
Andean cordillera; Argentina; Broken retroarc basin; Colorado and Negro rivers; Desaguadero; Drainage network; Flat-slab subduction; Sedimentary petrology; Sierras Pampeanas
Disciplines
Earth Sciences
File Format
File Size
4506 KB
Language
English
Rights
IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Repository Citation
Garzanti, E.,
Capaldi, T.,
Vezzoli, G.,
Limonta, M.,
Sosa, N.
(2021).
Transcontinental Retroarc Sediment Routing Controlled by Subduction Geometry and Climate Change (Central and Southern Andes, Argentina).
Basin Research, 33(6),
3406-3437.
Wiley.
http://dx.doi.org/10.1111/bre.12607