Guzman O.,Simon Bolivar University of Venezuela |
Guzman O.,University of Savoy |
Vassallo R.,University of Savoy |
Audemard F.,Central University of Venezuela |
And 6 more authors.
Journal of South American Earth Sciences | Year: 2013
In this study, we discuss the first cosmogenic 10Be dating of river terraces located in the lower reaches of the Santo Domingo river (Southeastern flank of the Mérida Andes, Western Venezuela). The geomorphic observations and dating allowed the restoration of the temporal evolution of incision rate, which was analysed in terms of tectonic, climatic and geomorphic processes. The long-term incision rate in the area has been constantly around 1.1 mm/a over the last 70 ka. Taking into account the geologic and geomorphologic setting, this value can be converted into the Late Pleistocene uplift rate of the Southeastern flank of the Mérida Andes. Our results show that the process of terraces formation in the lower reaches of the Santo Domingo river occurred at a higher frequency (103-104 years) than a glacial/interglacial cycle (104-105years). According to the global and local climate curve, these terraces were abandoned during warm to cold transitions. © 2013 Elsevier Ltd.