834S de los sulfuros silúricos tipo "sedex" de Latedo-Sejas de Aliste (Zamora, España)
8 34S of the "sedex" type Silurian sulphides of Latedo-Sejas de Aliste (Zamora, Spain)
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Publication Date
1996 -
Publisher
Sociedad Geológica de España -
Abstract
The sulphides of Latedo-Sejas are mainly constituted of pyrite-pyrrhotite and, on the basis of their textural and structural characteristics, two mineralógicaI stages have been differentiated: syn-diagenetic and/or metamorphic (before or syn-phase 1) and syn-phase 3. The mineralization is associated to two processes of alteration: carbonatization and chloritization. Owe to S34S values, a biogenic origin can be attributed to these sulphides with greater hydrothermal contamination in Latedo. The changes in 8 34S values are due to the transit from a deep anoxic to another shallow and coastal environment in the sedimentary basin