Fifth-order cyclicity and organic matter contents relationship (Lower Eocene, Pyrenees)
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| Format: | Artículo científico |
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Universitat de Barcelona
2007
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| author | E. Playà |
| author_facet | E. Playà |
| contents | Fifth-order cyclicity and organic matter contents relationship (Lower Eocene, Pyrenees) E. Playà F. Calvet J. Giménez-Montsant A. Permanyer Ciencias de la Tierra Cherty Eocene Cyclicity ostracode facies Corones Formation The Upper Limestone Member of the Corones Formation of the Spanish Pyrenees consists of various units(Lower and Upper Foraminifera Units, Shale Unit, Cherty-ostracode Unit, Ostracode Unit and Chara-ostracodeUnit) and offers strong facies and lateral thickness (20 to 80 m) variations. Detailed facies analyses, fifth-ordercycles and organic geochemical determinations in the central domain of the Corones platform carbonates(Cherty-ostracode Unit), lower Eocene in age, were carried out to establish a case of close relationship betweenvariations in organic matter productivity and cyclicity with annual period. The Cherty-ostracode Unit displays acontinuous and pervasive fifth-order cyclicity, represented by 5 cycles. Each cycle consists of a lower part (molluscfacies) and an upper part (laminated ostracode facies). The calculated fifth-order cycle period ranges fromabout 17,000 to 28,000 years, which falls within the Milankovitch Band. Variations in organic matter contentrelated to these carbonate cycles have been established. The lower mollusc facies members show a low organiccarbon content and Hydrogen Index (HI) below 0.6% in weight and 261, respectively. By contrast, the upperlaminated ostracode facies members show high organic carbon contents (up to 2% in weight) and high HI(between 164 and 373), and are also characterized by important silicification processes (the content in chert isup to 30%). The organic geochemistry resulting from these organic rich levels reflects a contribution of algalmarine input. 2007 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50550105 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1 Vol.5 |
| format | Artículo científico |
| id | redalyc_50550105 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universitat de Barcelona |
| spellingShingle | Fifth-order cyclicity and organic matter contents relationship (Lower Eocene, Pyrenees) E. Playà Ciencias de la Tierra Cherty Eocene Cyclicity ostracode facies Corones Formation Fifth-order cyclicity and organic matter contents relationship (Lower Eocene, Pyrenees) E. Playà F. Calvet J. Giménez-Montsant A. Permanyer Ciencias de la Tierra Cherty Eocene Cyclicity ostracode facies Corones Formation The Upper Limestone Member of the Corones Formation of the Spanish Pyrenees consists of various units(Lower and Upper Foraminifera Units, Shale Unit, Cherty-ostracode Unit, Ostracode Unit and Chara-ostracodeUnit) and offers strong facies and lateral thickness (20 to 80 m) variations. Detailed facies analyses, fifth-ordercycles and organic geochemical determinations in the central domain of the Corones platform carbonates(Cherty-ostracode Unit), lower Eocene in age, were carried out to establish a case of close relationship betweenvariations in organic matter productivity and cyclicity with annual period. The Cherty-ostracode Unit displays acontinuous and pervasive fifth-order cyclicity, represented by 5 cycles. Each cycle consists of a lower part (molluscfacies) and an upper part (laminated ostracode facies). The calculated fifth-order cycle period ranges fromabout 17,000 to 28,000 years, which falls within the Milankovitch Band. Variations in organic matter contentrelated to these carbonate cycles have been established. The lower mollusc facies members show a low organiccarbon content and Hydrogen Index (HI) below 0.6% in weight and 261, respectively. By contrast, the upperlaminated ostracode facies members show high organic carbon contents (up to 2% in weight) and high HI(between 164 and 373), and are also characterized by important silicification processes (the content in chert isup to 30%). The organic geochemistry resulting from these organic rich levels reflects a contribution of algalmarine input. 2007 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50550105 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1 Vol.5 |
| title | Fifth-order cyclicity and organic matter contents relationship (Lower Eocene, Pyrenees) |
| topic | Ciencias de la Tierra Cherty Eocene Cyclicity ostracode facies Corones Formation |
| url | https://www.redalyc.org/articulo.oa?id=50550105 |