Evolution of pleistocene travertine depositional system from terraced slope to fissure-ridge in a mixed travertine-alluvial succession (Jebel El Mida, Gafsa, Southern Tunisia)
| Autor: | Mehmet Cihat Alçiçek, Andrea Brogi, Mohsen Henchiri, Ramdhane Benassi, Walid Ben Ahmed |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Tunisia
010504 meteorology & atmospheric sciences Pleistocene hydrothermal fluid Fault (geology) 010502 geochemistry & geophysics 01 natural sciences Sedimentary depositional environment Paleontology lcsh:Engineering geology. Rock mechanics. Soil mechanics. Underground construction Group (stratigraphy) Gafsa paleoclimate alluvial deposit Alluvium Pleistocene Tunisia 0105 earth and related environmental sciences Earth-Surface Processes depositional environment Travertine geography geography.geographical_feature_category lcsh:QE1-996.5 Alluvial fan terrigenous deposit thermal spring lcsh:Geology geological record Geophysics lcsh:TA703-712 Facies Depositional system evolution fissure Quaternary Geology |
| Zdroj: | Geodinamica Acta, Vol 29, Iss 1, Pp 20-41 (2017) |
| DOI: | 10.1080/09853111.2016.1265398 |
| Popis: | The Quaternary stratigraphic record of Jebel El Mida, composed of continental deposits, is a useful example of concomitant travertines and alluvial deposition in an extensional setting. Travertine deposition occurred in a faulted Pleistocene alluvial fan giving rise to seven (recognised) facies interfingering with five other alluvial ones. The travertine depositional events indicate a tectonically driven evolution from terraced slope (facies group FC1–FC6) to a travertine fissure ridge-type depositing phase (facies group of FC1–FC7). Interfingering between travertine and alluvial facies indicates the co-existence of adjacent and time-equivalent depositional environments. The travertine deposition resulted from deep origin hydrothermal fluids channelled along damaged rocks volumes associated to a regional fault system, named as the Gafsa Fault (GF). The travertine–terrigenous succession in Jebel El Mida highlights the major role played by the GF in controlling: (i) the hydrothermal fluid flow, still active as also indicated by the numerous thermal springs aligned along the fault zone; (ii) paleoflow directions, discharge locations, volume, rate and fluctuations of the water supply. The paleoclimatic correlation with adjacent localities reveals that, at that time, humid episodes could have contributed to the recharge of the hydrothermal system and to the deposition of alluvial sediments. © 2017 The Author(s). |
| Databáze: | OpenAIRE |
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