Las unidades litoestratigráficas del tránsito Triásico-Jurásico en la región de Lécera (Zaragoza)
One of the main challenges in the stratigraphy of the Mesozoic sediments of the Iberian Ranges is the recognition ofthe Triassic-Jurassic boundary. Subsurface data provided by the hydrocarbon wells drilled in the not outcropping portions of the basin show the presence of a thick evaporitic section i...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1997 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | español |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/10452 |
| Acceso en línea: | http://hdl.handle.net/10272/10452 |
| Access Level: | acceso abierto |
| Palabra clave: | Triassic Jurassic Iberian Ranges Lithostratigraphy Biochronostratigraphy Palynomorphs Sequence stratigraphy |
| Sumario: | One of the main challenges in the stratigraphy of the Mesozoic sediments of the Iberian Ranges is the recognition ofthe Triassic-Jurassic boundary. Subsurface data provided by the hydrocarbon wells drilled in the not outcropping portions of the basin show the presence of a thick evaporitic section interbedded between the Imon and the Cuevas Labradas Fms. These evaporites are normally dissolved in the surface, where they are represented by the Carniolas of Cortes de Tajuna Fm. However, unusual cropping out of these evaporitic succession at the Lecera region has provided the opportunity to study a surface section of these evaporitic materials. The Lecera Formation, defined in this work, is composed of gypsum, anhydrite and carbonates, and can be correlated with surface and subsurface data. Palynological data confirms a Carnian age for the Keuper facies and an Hettangian age for the Carniolas located on top ofthe Lecera Fm. Regional data indicate a Rhaetian age for the carbonates of the Imon Fm. All these data confirm that the Triassic-Jurassic boundary should be located inside the here defined Lecera Fm. |
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