Chronology of fluvial terrace sequences for large Atlantic rivers in the Iberian Peninsula (Upper Tagus and Duero drainage basins, Central Spain)
| Autor: | Pedro Huerta, Elvira Roquero, Pablo G. Silva, Antonio Miguel Martínez-Graña, Mario López-Recio |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010506 paleontology
Archeology Global and Planetary Change geography geography.geographical_feature_category Pleistocene Drainage basin Fluvial Geology Downcutting 010502 geochemistry & geophysics 01 natural sciences Paleontology Terrace (geology) Fluvial terrace Alluvium Quaternary Geomorphology Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Quaternary Science Reviews. 166:188-203 |
| ISSN: | 0277-3791 |
| Popis: | This work analyses the chronology of fluvial terrace sequences of the two most important fluvial basins from central Spain draining to the Atlantic Ocean (Upper Tagus and Duero drainage basins). Both basins evolved under similar Mediterranean climatic conditions throughout the Pleistocene and present comparable number of fluvial terraces (16–17) after excluding the higher terrace levels of the Tagus (T1–T5) entrenched in the Rana surface. These higher “ranizo terraces” was formed in response to fan-head trenching in this high alluvial piedmont (+220 m) and therefore not properly controlled by Quaternary fluvial downcutting. The study accomplishes the implementation of multiple regression analyses for terrace height-age relationships. To transform relative terrace heights above the present river thalwegs (i.e. +100 m) in numerical ages a “height-age transference function” has been developed on the basis of preliminary statistical geochronological approaches proposed for Central Spain. The resultant height-age transference function gather 73 published geochronological data for terrace sequences, featuring a 3rd Order Polynomial Function (R2 0.90). This function describes the overall trend of valley downcutting for the last c. 2.3 Ma in Central Spain and is used to assign numerical ages to terrace levels at different relative elevation. |
| Databáze: | OpenAIRE |
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