Thermal history constraints from studies of organic, clay minerals, fluid inclusions and apatite fission tracks at the ardeche paleo-margin

摘要: The thermal history of the Ardeche paleo-margin (southeastern France) has been reconstructed using various analytical data from minerals and organic matter and conventional interpretation. These methods comprise Tmax and vitrinite reflectance measurements on organic matter, determination of the smectite content in mixed-layer illite/smectite, fluid-inclusion microthermometry in quartz, barite, dolomite, and anhydrite, and fission-track analyses in apatite. The Balazuc (BAI) drill hole, 1730 m deep, intersects mainly Jurassic carbonate rocks, Triassic sandstones, and sulfate-rich claystones and ends in Carboniferous rocks. The present bottom-hole temperature is 70 C. Other drill holes, less than 6 km away, were studied when necessary. One of the main objectives of this paper is to assess the agreement between the different geothermometric methods, and to check their limitations and convergence when used on …