Análisis sedimentológico de los materiales lacustres (formacion de Gorafe-Huelago) del sector central de la depresión de Guadix

Abstract

Sedimentological and petrological analysis of the Gorafe-Huélago formation (pliocene) permits to distinguish some different facies types which characterize the following subenvironments of lacustrine carbonate sedimentation: lutitic plain (silts, carbonatic silts and sands), swamps (coaly marls), carbonatic marshy rim (root-bioturbated limestones, nodulzar lemistones, paleosols, calcareous crusts and nodular marls) and lacustrine zone (algal limestones, fossiliferous limestones, marly limestones and marls). The distribution of this facies was strongly controlled by the tectonics (Negratin accident), which delimited a southern sunken block, predominantly with terrigenous facies (lutitic plain and swamps) and a northern uplifted block in which there is a greater development of carbonatic lacustrine sediments. Finally, these facies are organized in retractive, expansive or expansive-retractive sequences which mark the sedimentological evolution of the formation.