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Geological Society, London, Special Publications; 1998; v. 144; p. 145-151;
DOI: 10.1144/GSL.SP.1998.144.01.11
© 1998 Geological Society of London

Case Studies Assessing Timing of Fluid Flow Events

Thermal history and timing of fluid flow at the Ardèche palaeomargin, France

Maurice Pagel1, Norbert Clauer2, Jean-Robert Disnar3, Jean-Rémi Mossmann4, Jean-François Sureau4, Michel Steinberg1 & Charlotte Vinchon4

1 Département des Sciences de la Terre et EP CNRS 1748 ORSAYTERRE, Bât. 504, Université de Paris Sud, 91405 Orsay Cédex, France
2 Centre de Géochimie de la Surface (CNRS-ULP), 1 rue Blessig, 67084 Strasbourg Cedex, France
3 URA CNRS 724, Bât. Géosci., Université d’Orléans, BP 6759, 45067 Orléans Cedex, France
4 BRGM, BP 6009, 45060 Orléans, France

The fluid evolution, the timing of fluid flow and the thermal history of the faulted Ardèche passive palaeomargin, France, were reconstructed using detailed mineralogical, petrological, geochemical and geophysical studies applied on core material from Triassic sandstone and Liassic carbonate units of the BA1 and MM1 boreholes. It could be shown that an early cementation significantly reduced the porosity of the rocks. Application of various geothermometers and chronothermometers showed that the outcropping Jurassic units underwent a degree of diagenetic evolution corresponding to the onset of the oil window. In the Triassic sandstone, temperatures reached 130–145°C as recorded by the dolomitic cements. Fluids in thermal disequilibrium with their host rock were found, implying supply of fluids from deeper levels. The decrease of temperature below 120 ± 10°C during the Eocene is explained by the erosion of 1900 m of mainly Cretaceous sediments. A fault system was active at different periods, especially at 190 Ma and during the post-Cretaceous uplift.