Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary
The study across the Pliensbachian–Toarcian boundary sedimentary record in the Bizanet section of the Pyrenean Basin (southern France) revealed the presence of solid bitumen. This secondary organic matter was characterized using petrographic (transmitted and reflected white lights, incident blue lig...
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MDPI AG
2021-11-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/11/12/1338 |
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| author | Carolina Fonseca João Graciano Mendonça Filho Carine Lézin Frederico Sobrinho da Silva Luís V. Duarte |
| author_facet | Carolina Fonseca João Graciano Mendonça Filho Carine Lézin Frederico Sobrinho da Silva Luís V. Duarte |
| author_sort | Carolina Fonseca |
| collection | DOAJ |
| description | The study across the Pliensbachian–Toarcian boundary sedimentary record in the Bizanet section of the Pyrenean Basin (southern France) revealed the presence of solid bitumen. This secondary organic matter was characterized using petrographic (transmitted and reflected white lights, incident blue light, and scanning electron microscopy) and geochemical (total organic carbon, total sulfur, and insoluble residue) techniques. The spore coloration index (SCI) was also determined. With the characterization of the optical properties and reflectance of the solid bitumen, it was possible to distinguish four different families (A–D) that display a wide range of reflectance values, from 0.21% to 2.64% BR<sub>r</sub>, i.e., from glance pitch to meso-impsonite. SCI values were higher than 9–9.5 (%R<sub>eq</sub> > 1.50%). The comparison between the equivalent vitrinite reflectance values of the solid bitumen and SCI showed that this index and the solid bitumen D values are concordant, indicating that solid bitumen D can be considered an indigenous bitumen. The other three families of solid bitumen (A–C) are considered as having migrated. The laterally equivalent Pont de Suert section (South Pyrenean Zone) displays no trace of solid bitumen which points to the important role of the morphotectonic context of the Bizanet section in the migration of these hydrocarbons, namely, the presence of a major thrust fault in the eastern Corbières close to the section’s location. |
| first_indexed | 2024-03-10T03:31:50Z |
| format | Article |
| id | doaj.art-ea90aef1a9434b02ace1736ea3126670 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T03:31:50Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-ea90aef1a9434b02ace1736ea31266702023-11-23T09:41:26ZengMDPI AGMinerals2075-163X2021-11-011112133810.3390/min11121338Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian BoundaryCarolina Fonseca0João Graciano Mendonça Filho1Carine Lézin2Frederico Sobrinho da Silva3Luís V. Duarte4Géosciences Environnement Toulouse, University of Toulouse, CNES, CNRS, IRD, UPS, 31400 Toulouse, FranceLaboratório de Palinofácies e Fácies Orgânica (LAFO), Departamento de Geologia, Instituto de Geociências, Federal University of Rio de Janeiro, Rio de Janeiro 21941-916, BrazilGéosciences Environnement Toulouse, University of Toulouse, CNES, CNRS, IRD, UPS, 31400 Toulouse, FranceLaboratório de Palinofácies e Fácies Orgânica (LAFO), Departamento de Geologia, Instituto de Geociências, Federal University of Rio de Janeiro, Rio de Janeiro 21941-916, BrazilMARE-Marine and Environmental Sciences Centre, Department of Earth Sciences, Faculty of Sciences and Technology, University of Coimbra, 3030-790 Coimbra, PortugalThe study across the Pliensbachian–Toarcian boundary sedimentary record in the Bizanet section of the Pyrenean Basin (southern France) revealed the presence of solid bitumen. This secondary organic matter was characterized using petrographic (transmitted and reflected white lights, incident blue light, and scanning electron microscopy) and geochemical (total organic carbon, total sulfur, and insoluble residue) techniques. The spore coloration index (SCI) was also determined. With the characterization of the optical properties and reflectance of the solid bitumen, it was possible to distinguish four different families (A–D) that display a wide range of reflectance values, from 0.21% to 2.64% BR<sub>r</sub>, i.e., from glance pitch to meso-impsonite. SCI values were higher than 9–9.5 (%R<sub>eq</sub> > 1.50%). The comparison between the equivalent vitrinite reflectance values of the solid bitumen and SCI showed that this index and the solid bitumen D values are concordant, indicating that solid bitumen D can be considered an indigenous bitumen. The other three families of solid bitumen (A–C) are considered as having migrated. The laterally equivalent Pont de Suert section (South Pyrenean Zone) displays no trace of solid bitumen which points to the important role of the morphotectonic context of the Bizanet section in the migration of these hydrocarbons, namely, the presence of a major thrust fault in the eastern Corbières close to the section’s location.https://www.mdpi.com/2075-163X/11/12/1338solid bitumenthermal maturitysolid bitumen reflectancespore coloration indexPliensbachian–ToarcianPyrenean Basin |
| spellingShingle | Carolina Fonseca João Graciano Mendonça Filho Carine Lézin Frederico Sobrinho da Silva Luís V. Duarte Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary Minerals solid bitumen thermal maturity solid bitumen reflectance spore coloration index Pliensbachian–Toarcian Pyrenean Basin |
| title | Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary |
| title_full | Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary |
| title_fullStr | Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary |
| title_full_unstemmed | Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary |
| title_short | Solid Bitumen Occurrences in the Pyrenean Basin (Southern France): A Case Study across the Pliensbachian–Toarcian Boundary |
| title_sort | solid bitumen occurrences in the pyrenean basin southern france a case study across the pliensbachian toarcian boundary |
| topic | solid bitumen thermal maturity solid bitumen reflectance spore coloration index Pliensbachian–Toarcian Pyrenean Basin |
| url | https://www.mdpi.com/2075-163X/11/12/1338 |
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