Sediment provenance during Alpine orogeny: ...
Document type :
Article dans une revue scientifique: Article original
Title :
Sediment provenance during Alpine orogeny: fluid inclusions and stable isotopes on quartz–calcite veins from detritic pebbles
Author(s) :
Grosjean, Anne-Sabine [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Biogéosciences [UMR 6282] [BGS]
Laboratoire Magmas et Volcans [LMV]
Gardien, Véronique [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Dubois, Michel [Auteur]
Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 [LGCgE]
Boulvais, Philippe [Auteur]
Géosciences Rennes [GR]
Martini, Rossana [Auteur]
Department of Earth Sciences [Geneva]
Vennemann, Torsten [Auteur]
Institut des sciences de la terre [Lausanne] [ISTE]
Pittet, Bernard [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Biogéosciences [UMR 6282] [BGS]
Laboratoire Magmas et Volcans [LMV]
Gardien, Véronique [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Dubois, Michel [Auteur]

Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 [LGCgE]
Boulvais, Philippe [Auteur]
Géosciences Rennes [GR]
Martini, Rossana [Auteur]
Department of Earth Sciences [Geneva]
Vennemann, Torsten [Auteur]
Institut des sciences de la terre [Lausanne] [ISTE]
Pittet, Bernard [Auteur]
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [LGL-TPE]
Journal title :
Swiss Journal of Geosciences
Pages :
329-344
Publisher :
Springer
Publication date :
2016
ISSN :
1661-8726
English keyword(s) :
Oxygen and carbon isotopes
Provenance
Oligocene
Water–rock interactions
Western Alps
Provenance
Oligocene
Water–rock interactions
Western Alps
HAL domain(s) :
Planète et Univers [physics]/Sciences de la Terre/Géochimie
English abstract : [en]
An innovative multidisciplinary approach was used on quartz–calcite veins that crosscut pebbles of several lithologies from the French South Alpine Foreland Basin to discern the source of detrital sediments. Microthermometric ...
Show more >An innovative multidisciplinary approach was used on quartz–calcite veins that crosscut pebbles of several lithologies from the French South Alpine Foreland Basin to discern the source of detrital sediments. Microthermometric results indicate that inclusions contain low to moderate salinity (0.9–9.8 wt% eq. NaCl) fluids. Oxygen and carbon isotope compositions of quartz and calcite (δ18O mean at +24.1 and +24.7 ‰ respectively (V-SMOW) and δ13C from −1.1 to +2.0 ‰ (V-PDB)) are comparable with the composition of their host rocks (δ18O from +17 to +24.3 ‰ and δ13C from −4 to +1.4 ‰). The calculated δ18O and δ13C values of the fluid trapped in quartz and calcite range from +9.3 to +21.9 ‰, and from −2.6 to +4.1 ‰ respectively. These data suggest isotopic buffering of the fluid by the host rocks. Fluid trapping conditions were 105–185 MPa and 175–310 °C. Using a lithostatic gradient, the conditions of fluid entrapment correspond to a depth of vein formation from 4 to 7 km. Petrographic and geochemical data obtained on the host rocks, their veins and fluid inclusions suggest that the source of the conglomerates is the inner part of the Alps rather than reliefs surrounding the foreland basin. The study of fluid inclusions in veins provides a powerful and innovative approach to link the production of detrital sediments with tectonic events, to trace the provenance of conglomerates and to reconstruct the regional geometry of the drainage system.Show less >
Show more >An innovative multidisciplinary approach was used on quartz–calcite veins that crosscut pebbles of several lithologies from the French South Alpine Foreland Basin to discern the source of detrital sediments. Microthermometric results indicate that inclusions contain low to moderate salinity (0.9–9.8 wt% eq. NaCl) fluids. Oxygen and carbon isotope compositions of quartz and calcite (δ18O mean at +24.1 and +24.7 ‰ respectively (V-SMOW) and δ13C from −1.1 to +2.0 ‰ (V-PDB)) are comparable with the composition of their host rocks (δ18O from +17 to +24.3 ‰ and δ13C from −4 to +1.4 ‰). The calculated δ18O and δ13C values of the fluid trapped in quartz and calcite range from +9.3 to +21.9 ‰, and from −2.6 to +4.1 ‰ respectively. These data suggest isotopic buffering of the fluid by the host rocks. Fluid trapping conditions were 105–185 MPa and 175–310 °C. Using a lithostatic gradient, the conditions of fluid entrapment correspond to a depth of vein formation from 4 to 7 km. Petrographic and geochemical data obtained on the host rocks, their veins and fluid inclusions suggest that the source of the conglomerates is the inner part of the Alps rather than reliefs surrounding the foreland basin. The study of fluid inclusions in veins provides a powerful and innovative approach to link the production of detrital sediments with tectonic events, to trace the provenance of conglomerates and to reconstruct the regional geometry of the drainage system.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Source :
Files
- document
- Open access
- Access the document
- Grosjean2016_Article_SedimentProvenanceDuringAlpine.pdf
- Open access
- Access the document
- Grosjean2016_Article_SedimentProvenanceDuringAlpine.pdf
- Open access
- Access the document
- document
- Open access
- Access the document
- Grosjean2016_Article_SedimentProvenanceDuringAlpine.pdf
- Open access
- Access the document