Xavier Mangenot received the 2018 Van Straelen PhD Thesis Prize awarded by the Société Géologique de France (SGF).
Summary of his thesis:
Since the 1970s, the reconstruction of the thermal history of sedimentary basins is mainly based on the chemical and physical properties of organic matter preserved in geological strata. More recently, the improvement of rock analysis techniques has led to the emergence of two new promising isotope tools for studying carbonate minerals. These methods are the clumped isotopes Δ47 thermometer and U-Pb chronometer (LA-ICP-MS) that show high potential to simulteanously constrain the absolute temperature and age of any carbonate mineralization events with an unprecedented accuracy. The coupling of these two new isotopic tools was employed for the first time during this PhD, and led to the development of a first-of-it-kind thermo-chronometer for carbonate bearing rocks, denoted Δ47 / (U-Pb). This approach was tested on the Middle Jurassic carbonate of the Paris Basin, and revealed the possibility to reconstruct a direct and precise time-temperature path over more than 150 million years of rock history. Given the widespread occurrence of carbonates in a variety of crustal and sedimentary settings, such approach opens a new realm for thermo-chronological applications.