Secuencias experimentales de reacción entre sulfuros y carbonatesun análogo de la sedimentación marina en ambientes anóxicos
- A. Santos
- P.J. Extremera
- J.V. Navarro-Gascón
- S. Fernández-Bastero
- L. Gago-Duport
ISSN: 1576-5172
Año de publicación: 2000
Título del ejemplar: V Congreso Geológico de España (Alicante, 10-14 julio 2000)
Número: 1
Páginas: 71-74
Tipo: Artículo
Otras publicaciones en: Geotemas (Madrid)
Resumen
With the aim of establishing the relations that exist between certain minerals, sulphides and carbonates, in anoxic marine environments as well as to understand the factors and mechanisms that control the reactions that are necessary for their formation or dissolution, a number of laboratory experiments are carried out to simulate in detail the reactions in shallow water carbonate sediments and the sulphate reduction reactions in shallow water siliciclastic sediments in which the content and the reactivity of Fe is not a limiting factor. In the experiments a series of coupled reactions take place that cause, in the first case the dissolution of aragonite and the recristallization ofcalcite and, in the second case the formation of amorphous iron sulphides and the formation of siderite. In addition the diagenetic environments for the formation of these components, sulphides and carbonates, in the sediments of the Bay of Cadiz are explained.