Fluvial terrace formation in a mountainous area (2): influence of eustatism, tectonics and altitudinal distribution of watersheds based on an allostratigraphic study (Albania)
Résumé
Abstract The Magallanes–Fagnano Fault is an active strike‐slip structure accommodating the relative displacement between South America and the Scotia Plate. The Chilean portion of the fault is poorly studied because most of it runs below the sea level in the Strait of Magellan. Our tectonic geomorphological study is focused on a rare onshore fault section, along which streams horizontally deflected by hundreds of metres since the last main deglaciation are compatible with a dominant left‐lateral fault kinematics and yield a slip rate of 15.7 ± 2.4 mm/year. This rate is between 2 and 3 times higher than the one estimated on the Argentinian portion of the fault over the same period. This spatial variation may be due to both glacial unloading on the fault zone and/or structural factors. These results point out the need to study strike‐slip faults on several portions to unravel behaviour changes related to internal or external forcing.
Mots clés
Strath Fill-terraces Strath terraces Climatic and vegetation controls Late glacial stage Paraglacial. Funding. NATO SFP 977993 Science for Peace team Simon Bolivar University IRD-DPF
Strath
Fill-terraces
Strath terraces
Climatic and vegetation controls
Late glacial stage
Paraglacial. Funding. NATO SFP 977993
Science for Peace team
Simon Bolivar University
IRD-DPF
Domaines
Planète et Univers [physics]Origine | Fichiers éditeurs autorisés sur une archive ouverte |
---|