Provenance constraints on the Tremp Formation paleogeography (southern Pyrenees): Ebro Massif VS Pyrenees sources |
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| Affiliation: | 1. Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, Universitat de Barcelona, C/ Martí i Franquès, s/n, 08028 Barcelona, Spain;2. Departament d''Enginyeria Civil i Ambiental, Universitat Politècnica de Catalunya, C/ Jordi Girona, 1-3, 08034 Barcelona, Spain;3. Departament de Medi Ambient i Ciències del Sòl, Universitat de Lleida, C/ Av. Alcalde Rovira i Roure 191, 25198 Lleida, Spain;1. Departamento de Estratigrafía, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain;2. Instituto de Geociencias IGEO (CSIC, UCM), C/José Antonio Novais 12, 28040 Madrid, Spain;3. Fundación Conjunto Paleontológico de Teruel-Dinópolis, Avda. Sagunto s/n, 44002 Teruel, Spain;4. Departament de Geologia (Unitat de Paleontologia), Universitat Autònoma de Barcelona, Campus Bellaterra, 08193 Cerdanyola del Vallés, Spain;5. Department of Geobiology (Geoscience Centre), Georg-August-University Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany;6. Departamento de Geología, Universidad de Oviedo, C/Jesús Arias de Velasco s/n, 33005 Oviedo, Spain |
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| Abstract: | A detailed petrological study has been performed for the end-Cretaceous clastic deposits of the southern Pyrenees. Provenance results indicate that the Maastrichtian systems from both the Àger and the Vallcebre synclines show compositional features that mainly consist of a high proportion of single and polycrystalline quartz grains, feldspar and plutonic fragments. By contrast, the sandstone systems of the Tremp syncline exhibit minor contributions from igneous source areas and higher amounts of carbonatic components. These results reveal that the Tremp basin had a source area interpreted as situated to the North in the uplifting Pyrenees. The fact that this basin does not show a high plutonic source signal indicates that the Àger and the Vallcebre basins had been fed from a distinct source area located to the South, here interpreted as the Ebro Massif. Thus, the differences mentioned above might imply that the Montsec High acted as a barrier, avoiding a southern influence in the Tremp basin. |
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| Keywords: | Provenance Sediment routing Petrography Southern Pyrenees Maastrichtian Foreland basin Tremp Formation |
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