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Patterns of geochemical variability in relation to turbidite facies in the Grès d'Annot Formation

Daniel Garcia 1, 2, 3 Philippe Joseph 4 Benoît Maréchal 1, 2 Jacques Moutte 1, 2, 3 
3 LMV-ENSMSE - Laboratoire Magmas et Volcans
Mines Saint-Étienne MSE - École des Mines de Saint-Étienne, SPIN, CNRS - Centre National de la Recherche Scientifique : UMR6524, LMV - Laboratoire Magmas et Volcans : UMR 6524
Abstract : The deep marine Grès d'Annot Formation is one of the best exposed analogues to sand-rich turbidite sub-surface systems. Provenance and reservoir heterogeneities have been investigated through a geochemical study of different areas and facies in this formation. Most compositions may be described as mixtures between carbonate and three clastic end-members, i.e. clay, framework grains and a subset of the heavy minerals (zircon, Tioxide, apatite, monazite). These end-members have a nearly uniform chemistry over the studied area and a granite-dominated provenance consistent with a Corsica-Sardinia source hypothesis. This rather uniform provenance makes the Annot Formation a favourable case for exploring the relationships between facies and geochemistry. Not only do different facies differ in average composition, but chemical variations at the bed scale fingerprint the depositional mechanism: archetypal (graded) turbidites and traction-dominated (over-bank) deposits display contrasting variation trends in geochemical plots. The local-scale variation patterns and the general relationship between grain size and chemistry are tentatively integrated in a single differentiation model, providing a rationale for the use of geochemistry in provenance studies, and a possible way to characterize sedimentary facies.
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Submitted on : Wednesday, August 3, 2011 - 9:50:57 AM
Last modification on : Tuesday, October 19, 2021 - 6:59:59 PM


  • HAL Id : emse-00613154, version 1


Daniel Garcia, Philippe Joseph, Benoît Maréchal, Jacques Moutte. Patterns of geochemical variability in relation to turbidite facies in the Grès d'Annot Formation. Journal Geol. Soc. Spec. Public, 2004, 221, pp.349-365. ⟨emse-00613154⟩



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