Stratigraphy of the tectonically imbricated lithological succession of the Neves Corvo mine area,Iberian Pyrite Belt,Portugal |
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| Authors: | J?Tomás?Oliveira Email author" target="_blank">Zélia?PereiraEmail author Pedro?Carvalho Nelson?Pacheco Dieter?Korn |
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| Institution: | (1) Instituto Geológico e Mineiro, Apartado 7586, 2721-866 Alfragide, Portugal;(2) Instituto Geológico e Mineiro, Apartado 89, 4466-956 S. Mamede Infesta, Portugal;(3) CONSMAGA, R. Cova da Burra 5, 7700-031 Almodovar, Portugal;(4) SOMINCOR, Apartado 12, 7780 Castro Verde, Portugal;(5) Museum für Naturkunde, Humboldt Universität Berlin, Invalidenstrasse 43, 10115 Berlin, Germany |
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| Abstract: | Biostratigraphic research, based on palynomorphs and ammonoids, of the tectonically imbricated lithological succession of the Neves Corvo mine, in the Portuguese part of the Iberian Pyrite Belt, has yielded ages for all formerly recognised lithostratigraphic units. These can be assembled in three main lithological sequences: (1) detrital sandy/shale substrate (Phyllite-Quartzite Formation) of late Famennian age; (2) Volcano-Sedimentary Complex, divided into a lower and an upper suite, in which one basic, three dolerite sills and four felsic volcanic units and a mineralised package of massive sulphides are identified with ages which range from the late Famennian to the late Visean; (3) flysch succession (Mértola Formation) composed of shale and greywacke dated as late Visean to early Serpukhovian. Precise biostratigraphic dating of the sedimentrary host rocks of massive sulphide mineralisation constrains the age of the latter to the late Strunian (354.8–354.0 Ma). Three stratigraphic hiatuses, corresponding to early/middle Strunian, Tournaisian and early Visean respectively and a south-westward progressive unconformity were also recognised. Sequences 1 and 2 are related to extensional episodes while sequence 3 marks the beginning of compressive tectonic inversion which gave rise to south-westward flysch progradation in close relation to a foreland basin development. Our results lead to the reinterpretation of the tectonic structure of the Neves Corvo mine, with implications for the interpretation of the regional basin dynamics and metal exploration.Editorial handling: F. Tornos |
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| Keywords: | Palynostratigraphy Neves Corvo mine Iberian Pyrite Belt Portugal |
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