Sedimentology of a supercritical-flow dominated fan delta (La Peza Formation, Serravalian? to Tortonian transition, Betic Cordillera)
DOI:
https://doi.org/10.55407/geogaceta98197Keywords:
supercritical flow, coarse-grained delta, fan delta, high-density turbiditeAbstract
This sedimentological study focuses on the grey detrital member of the La Peza Formation (Serravalian?-Lower Tortonian, SW of the Guadix Basin, Betic Cordillera) on the basis of outcrop observations. The 135 m thick succession consists of 15 coarsening and thickening-upward meter to decameter thick sequences made up of five facies association (FA 1-5) representing different depositional subenvironments: (A) Delta plain (distributary channel (FA-1) and distributary mouth-bar (FA-3), interdistributary bay (FA-2)); (B) Wave-dominated shoreface (FA-4), and (C) Chutes along a deltaic slope (FA-5). Gravel facies associations (FA-1, 3, 5) consists of deposition of high-concentration coarse-grained flows (i.e. from hiperconcentrated to high-density turbiditic flows) with common structures and bedforms linked to supercritical conditions related to hydraulic jumps in slopes or channel-lobe transition zones. All these features fit to a non-mature, steep and short sedimentary systems (fan delta-type) attached to a basin margin with emergent reliefs close to the coast.
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