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Tectonic and geomorphic controls on the fluvial styles of the Eslida Formation, Middle Triassic, Eastern Spain

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Arche, Alfredo and López Gómez, José (1999) Tectonic and geomorphic controls on the fluvial styles of the Eslida Formation, Middle Triassic, Eastern Spain. Tectonophysics, 315 . pp. 187-207. ISSN 0040-1951

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Abstract

The Eslida Fm is an alluvial unit of the Buntsandstein Facies of the Iberian Ranges deposited in a half-graben
basin over a period of 2–2.5 Ma during the lower Anisian (Middle Triassic). It can be subdivided into six cycles that
can be correlated along the basin. The overall architecture and cyclicity were controlled by the episodic activity of
the basin boundary fault. Two proximal source areas of minor importance and a distal one of major importance are
identified. The petrological composition of the sandstones is arkosic to subgrauwackic, indicating source areas
containing both low-metamorphic rocks and gneiss, and granitic rocks. Alluvial fans, very common in rift basins,
were not developed because of slow fault scarp retreat and the lack of large antecedent rivers cutting across the rift
shoulders. Paleocurrents point to the SE, except for a zone in the middle part of the basin where interference with a
NE–SW fault system deflected the channels to the S. The infilling of the basin is asymmetric in a transverse section,
with channel facies near the basin boundary fault to the NE and overbank facies in the distal SW part.


Item Type:Article
Uncontrolled Keywords:Asymmetric extension; Fluvial styles; Iberian Basin; Tectonic controls; Triassic
Subjects:Sciences > Geology > Geodynamics
ID Code:17674
Deposited On:15 Jan 2013 12:13
Last Modified:11 Dec 2018 08:42

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