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Active tectonics and drainage evolution in the Tunisian Atlas driven by interaction between crustal shortening and slab pull

AuthorsCamafort Blanco, Miquel; Booth-Rea, Guillermo; Pérez, J. Vicente; Melki, F.; Gràcia, Eulàlia ; Azañón, José Miguel ; Ranero, César R.
Issue Date23-Apr-2017
PublisherEuropean Geosciences Union
CitationGeophysical Research Abstracts 19: EGU2017-16770 (2017)
AbstractActive tectonics in North Africa is fundamentally driven by NW-SE directed slow convergence between the Nubiaand Eurasia plates, leading to a region of thrust and strike-slip faulting. In this paper we analyze the morphometriccharacteristics of the little-studied northern Tunisia sector. The study aimed at identifying previously unknownactive tectonic structures, and to further understand the mechanisms that drive the drainage evolution in this regionof slow convergence. The interpretation of morphometric data was supported with a field campaign of a selectionof structures. The analysis indicates that recent fluvial captures have been the main factor rejuvenating drainagecatchments. The Medjerda River, which is the main catchment in northern Tunisia, has increased its drainage areaduring the Quaternary by capturing adjacent axial valleys to the north and south of its drainage divide. Thesecaptures are probably driven by gradual uplift of adjacent axial valleys by reverse/oblique faults or associatedfolds like El Alia-Teboursouk and Dkhila faults. Our fieldwork found that these faults cut Holocene colluvial fanscontaining seismites like clastic dikes and sand volcanoes, indicating recent seismogenic faulting. The growth andstabilization of the axial Medjerda River against the natural tendency of transverse drainages might be causedby a combination of dynamic topography and transpressive tectonics. The orientation of the large axial Medjerdadrainage that runs from eastern Algeria towards northeastern Tunisia into the Gulf of Tunis, might be the associatedto negative buoyancy caused by the underlying Nubia slab at its mouth, together with uplift of the Medjerdaheadwaters along the South Atlassic dextral transfer zone
DescriptionEuropean Geosciences Union General Assembly 2017, 23-28 April 2017, Vienna, Austria.-- 1 page
Publisher version (URL)https://meetingorganizer.copernicus.org/EGU2017/posters/23636
Identifiersissn: 1607-7962
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