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Comunidades microbianas endoevaporíticas relacionadas con la precipitación de dolomita en ambiente lacustre salino: Mioceno de la Cuenca de Madrid

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Rodríguez Aranda, Juan Pablo and Sanz Montero, M. Esther and Calvo Sorando, José Pedro (2004) Comunidades microbianas endoevaporíticas relacionadas con la precipitación de dolomita en ambiente lacustre salino: Mioceno de la Cuenca de Madrid. Geotemas, 6 (2). pp. 115-118. ISSN 1576-5172

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Abstract

Microbial endoevaporite comunities thrivied in a Miocene saline lake where gypsum crystals were precipitate. As a result of both the survival strategies and the metabolic activities carried out by those communities, the gypsum crystals embedding them were intensely corroded and became, in some cases almost totally, replaced by microbially mediated dolomite. Bore holes in gypsum crystals, either filled or not, with cyanobacteria! remains, and the isotopic composition of the dolomite are, among others, the evidences provided to support this interpretation. The evaporitic unit also comprises marl, mudstone and dolomite layers. The later mainly represent laminar, domal and pustular stromatolites formed by biomineralization of cyanobacteriaI mats. Those processes took place in the different subenvironments of a mudflat-saline lake complex spread out the easternmost part of the Madrid Basin during the Lower Miocene (Lower Aragonian).


Item Type:Article
Uncontrolled Keywords:Endoevaporitic microbes, Gypsum replacement, Dolomite, Saline lake, Miocene
Subjects:Sciences > Geology > Petrology
ID Code:60787
Deposited On:05 Jun 2020 10:27
Last Modified:05 Jun 2020 10:28

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