Publication: Análisis sedimentológico de los materiales lacustres (formación de Gorafe-Huélago) del sector central de la Depresión de Guadix
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1988
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Consejo Superior de Investigaciones Científicas, Museo Nacional de Ciencias Naturales
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Abstract
El análisis sedimentológico y petrológico de los materiales carbonatados de la formación de Gorafe Huélago (Plioceno), ha permitido diferenciar diversas facies que caracterizan varios subambientes de sedimentación carbonatada dentro de un sistema deposicionai tluvio-lacustre: llanura lutítica (limos, limos carbonatados y arenas), zonas de encharcamiento palustre (margas carbonosas), orla palustre carbonatada (calizas bioturbadas por raíces, calizas nodulosas y paleosuelos, costras calcáreas y margas nodulosas) y zona lacustre (calizas algales laminadas y oncolíticas, calizas fosilíferas, calizas margosas y margas).
La evolución y distribución de las facies están controladas por el accidente tectónico del Negratin, fundamentalmente transcurrente y que atraviesa la zona de estudio con una dirección NE-SW. En el bloque levantado (sector N) tiene lugar una sedimentación carbonatada lacustre, mientras que en el bloque hundido (sector S) la sedimentación es fundamentalmente terrígena. Los materiales carbonatados que caracterizan la sedimentación lacustre se relacionan entre sí y con otras facies terrígenas en determinadas secuencias sedimentológicas lacustres: secuencias de retracción, secuencias de expansión y secuencias de expansión-retracción.
Sedimentological and petrological analysis of the Gorafe-Huélago formation (pliocene) permits to distinguish sorne 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, n<xlular lemistones, paleosols, calcareous crusts and nodular marls) and lacustrine zone (algal limestones, fossiliferous lirnestones, marly limestones and marls). The distribution of this facies was strongly controlled by the tectonics (Negratin accident), which delimited a southem sunken block, predominantly with terrigenous facies (lutitic plain and swamps) and a northem uplifted block in which there is a greater development of carbonatic lacustrine sediments. Finally, tbese facies are organized in retractive, expansive or expansive-retractive sequences which mark the sedimentological evolution of the formatión.
Sedimentological and petrological analysis of the Gorafe-Huélago formation (pliocene) permits to distinguish sorne 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, n<xlular lemistones, paleosols, calcareous crusts and nodular marls) and lacustrine zone (algal limestones, fossiliferous lirnestones, marly limestones and marls). The distribution of this facies was strongly controlled by the tectonics (Negratin accident), which delimited a southem sunken block, predominantly with terrigenous facies (lutitic plain and swamps) and a northem uplifted block in which there is a greater development of carbonatic lacustrine sediments. Finally, tbese facies are organized in retractive, expansive or expansive-retractive sequences which mark the sedimentological evolution of the formatión.