Publication: El registro sedimentario lacustre del maar de Fuentillejo (Ciudad Real)
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2006
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Instituto Geológico y Minero de España
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Abstract
La laguna del maar de Fuentillejo ha registrado múltiples fases de sedimentación detrítica, carbonática, sapropélica, evaporítica y orgánica, como muestra el sondeo de 142,25 m realizado en el centro del maar. Se han identificado 23 unidades sedimentarias, que reflejan los aportes variables de detríticos, la química de las aguas y los componentes orgánicos a lo largo de la historia del lago. Hay seis tipos
básicos de facies lacustres: 1) capas detríticas gradadas, que indican episodios erosivos en la cuenca de drenaje; 2) ritmitas detríticas, típicas de una sedimentación de ambiente profundo con aportes extracuencales; 3) ritmitas orgánico-carbonáticas de ambiente profundo con una elevada productividad; 4) evaporitas desarrolladas en un medio de elevada salinidad en ambiente semiárido de un lago efímero; 5) sapropeles, depositados durante períodos caracterizados por una elevada productividad y preservación en ambiente anóxico; 6) margas y limos masivos con estructuras de bioturbación correspondientes a un ambiente lacustre somero, con episodios de desecación.
The Fuentillejo maar lake in Ciudad Real province, records multiple phases of clastic, sapropelic, carbonatic, organic and evaporite dominated deposition, as revealed from a 142,25 m deep core drilled in the center of the maar. 23 major lithostratigraphic units have been identified, pointing out variations in clastic input, water chemistry and organic fraction throughout the history of the lake. There are 6 main sedimentary facies: 1) clastic graded beds indicative of erosive events on the catchment; 2) clastic rhythmites on a deep lake with frequent detrital inputs; 3) organic-carbonate rhythmites typical of higher organic productivity; 4) evaporites of an ephimeral lake in a semi-arid environment; 5) sapropels developed along periods of high productivity and high preservation of organic matter over anoxic lake floor; 6) bioturbated massive micrites and silts with dessecation events on a fluctuating lake level.
The Fuentillejo maar lake in Ciudad Real province, records multiple phases of clastic, sapropelic, carbonatic, organic and evaporite dominated deposition, as revealed from a 142,25 m deep core drilled in the center of the maar. 23 major lithostratigraphic units have been identified, pointing out variations in clastic input, water chemistry and organic fraction throughout the history of the lake. There are 6 main sedimentary facies: 1) clastic graded beds indicative of erosive events on the catchment; 2) clastic rhythmites on a deep lake with frequent detrital inputs; 3) organic-carbonate rhythmites typical of higher organic productivity; 4) evaporites of an ephimeral lake in a semi-arid environment; 5) sapropels developed along periods of high productivity and high preservation of organic matter over anoxic lake floor; 6) bioturbated massive micrites and silts with dessecation events on a fluctuating lake level.