Heavy-mineral assemblages as a provenance indicator in the Jaca basin (Middle-Late Eocene, southern Pyrenees)
The Jaca sequence records a major paleogeographic chang e in the south-central-pyrene an basin, recorded by the replacement of the deep-marine Hecho Group turbidites (Upper Lutetian) by deltaic and alluvials (Bartonian-Priabonian). This work studies the heavy-mineral assemblages of the Eocene clasti...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | inglés |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/14501 |
| Acceso en línea: | http://hdl.handle.net/10272/14501 |
| Access Level: | acceso abierto |
| Palabra clave: | Pyrenees Jaca basin Heavy minerals Provenance Pirineos Cuenca de Jaca Minerales pesados Procedencia |
| Sumario: | The Jaca sequence records a major paleogeographic chang e in the south-central-pyrene an basin, recorded by the replacement of the deep-marine Hecho Group turbidites (Upper Lutetian) by deltaic and alluvials (Bartonian-Priabonian). This work studies the heavy-mineral assemblages of the Eocene clastic systems in the northern Jaca basin, applying optical analysis and Raman spectroscopy. All the clastic systems display impoverished heavy-mineral suites, mainly constituted by titanium oxides, apatite, zircon and tourmaline. Other heavy minerals, as staurolite, weathered pyrite, goethite and hematite, are found in the a lluvial sy stems. Our results show a major heavy-mineral contentshift along the transition from turbidites tos hallow-water and continental deposits. The turbiditic systems display high content of apatite sourced from the Axial Zone in the eastern Pyrenees, where as the alluvial systems are characterized by a heavy-mineral suite contain ing goethite and staurolite. The shift is here interpreted as related to the onset of the Gavarnie thrust, which resulted in the uplift and recycling of the turbidites as well as the exhumation of Paleozoic basement, located to the nort h of the Jaca basin |
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