Procedencia de las areniscas y conglomerados de la sucesión estratigráfica del flanco sur del sinclinal de Santa Orosia (Bartoniense y Priaboniense inferior de la cuenca de Jaca)
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Abstract
La parte superior de la secuencia de Jaca registra un momento clave de
la evolución de la cuenca eocena surpirenaica mediante la sustitución de las
turbiditas del Grupo Hecho infrayacentes por los deltas de Sabiñánigo y
Santa Orosia-Atarés. Este último culminó con la instalación de ambientes
continentales que se extienden por la mayor parte de la cuenca de Jaca (Formación
Campodarbe). El estudio petrológico muestra que las petrofacies
más representativas de los deltas son calclititas y litoarenitas y que un cambio
composicional importante se produce en los depósitos aluviales de la
parte alta de los sistemas de Santa Orosia-Atarés. Este cambio, que se ha relacionado
con el inicio del cabalgamiento de Gavarnie, se manifiesta por el
alto contenido de areniscas híbridas recicladas, ausentes en los deltas. La
procedencia de las areniscas híbridas recicladas se ha identificado en las turbiditas
del Grupo Hecho, que recubrían una Zona Axial en elevación
The upper part of the Jaca sequence forms a key stage of evolution of the Eocene South Pyrenean basin and records the replacement of the underlying Hecho Group turbidites by the Sabiñánigo Sandstone and Santa Orosia-Atarés delta complexes. The latter ended up with generalized terrestrial environments all over most of the Jaca basin (Campodarbe Formation). The petrological study has shown that the most representative petrofacies of the deltas are calclithites and lithic arenites and that an important compositional change is recorded in the alluvial deposits of the upper Santa Orosia- Atarés systems. This change is here interpreted as related to the onset of the Gavarnie thrust and is evidenced by the high content of recycled hybrid sandstones, which are absent in the deltas. Provenance of the recycled hybrid sandstones has been identified in the turbidite sandstones of the Hecho Group, which originally overlay the uplifting Axial Zone
The upper part of the Jaca sequence forms a key stage of evolution of the Eocene South Pyrenean basin and records the replacement of the underlying Hecho Group turbidites by the Sabiñánigo Sandstone and Santa Orosia-Atarés delta complexes. The latter ended up with generalized terrestrial environments all over most of the Jaca basin (Campodarbe Formation). The petrological study has shown that the most representative petrofacies of the deltas are calclithites and lithic arenites and that an important compositional change is recorded in the alluvial deposits of the upper Santa Orosia- Atarés systems. This change is here interpreted as related to the onset of the Gavarnie thrust and is evidenced by the high content of recycled hybrid sandstones, which are absent in the deltas. Provenance of the recycled hybrid sandstones has been identified in the turbidite sandstones of the Hecho Group, which originally overlay the uplifting Axial Zone
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