Lower Paleocene Microcodium -rich calcarenites in hemipelagic areas of the Subbetic Zone, SE Spain: Sr isotopes, source area and palaeogeographic implications
The Danian−early Selandian Olivares and Majalcorón formations are two calcarenite units rich in Microcodium remains that were accumulated in a marine hemipelagic setting of the Subbetic Zone (Betic Cordillera, southern Spain). Their outcrops are restricted to relatively small areas surrounded by upl...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| 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:10272/17700 |
| Acceso en línea: | http://hdl.handle.net/10272/17700 |
| Access Level: | acceso abierto |
| Palabra clave: | Resedimented Microcodium Paleocene Subbetic Sr isotopes Microcodium resedimentado Paleoceno Subbética Isótopos de Sr |
| Sumario: | The Danian−early Selandian Olivares and Majalcorón formations are two calcarenite units rich in Microcodium remains that were accumulated in a marine hemipelagic setting of the Subbetic Zone (Betic Cordillera, southern Spain). Their outcrops are restricted to relatively small areas surrounded by uplifted Jurassic calcareous massifs, some of them with volcanic intercalations. The calcarenites contain lithoclasts of Lower Jurassic and lowermost Cretaceous age, and the 87 Sr/ 86 Sr isotopic ratios of the Microcodium remains suggest that they were originated in roots of plants that grew on Lower Jurassic carbonates. These facts entail that the Microcodium remains came from the calcareous massifs adjacent to their outcrops, the upper parts of which were subaerially exposed and colonized by Microcodium -producing plants during the Danian−early Selandian interval. The subaerial exposure of these massifs may have resulted from a coeval tectonic reactivation of Mesozoic syn-rift faults and folds, a eustatic sea level fall, or a combination of both processes |
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