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Dolomías primarias de ambiente lacustre salino: Mioceno de la Cuenca de Madrid

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Sanz Montero, M. Esther and Rodríguez Aranda, Juan Pablo and Calvo Sorando, José Pedro (2003) Dolomías primarias de ambiente lacustre salino: Mioceno de la Cuenca de Madrid. Geotemas, 5 . pp. 209-212. ISSN 1576-5172

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Abstract

The study focuses on dolomite carbonates that occur in a Miocene evaporitic succession, the Christmas tree gypsum unit. This unit outcrops in the eastern part of the Madrid Basin and it was deposited in a mudflatsaline lake complex during the Lower Miocene. Three types of dolostone facies have been considered: a) dolostone levels between mudstone or gypsum facies, b) patches and discontinuous levels of dolomite replacing gypsum crystals, and c) intra-and-inter-crystalline inclusions of dolomite in gypsum layers. Dolomites are mainly dolomicrites showing a low ordering degree and some Ca excess. Their isotopic composition [d l80, d13C) is characterized by light values. These dolostones are interpreted to be primary in origin and they are likely due to microbial activity as supported by facies relations, together with isotopic, textural and mineralógica! evidences.


Item Type:Article
Uncontrolled Keywords:Primary dolomite, Gypsum replacement, Miocene, Madrid Basin
Subjects:Sciences > Geology > Petrology
ID Code:61120
Deposited On:25 Jun 2020 11:58
Last Modified:25 Jun 2020 11:58

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