Reconstruction of low temperature (<100 °C) burial in sedimentary basins: A comparison of geothermometer in the intracontinental Paris Basin

Burial Diagenesis of Magnetic Minerals: New Insights from the Grès d’Annot Transect (SE France)

“…Blaise et al [11] also identified goethite for immature rocks in the Paris Basin. The samples from the Braux area show the occurrence of goethite, suggesting that this zone experienced temperatures below 60 °C if the burial diagenesis hypothesis is favored.…”

“…In the study area, magnetite is found throughout the entire transect in rocks that experienced a burial temperature <250 °C. Many studies reported also the occurrence of SD magnetite for such temperatures (e.g., [9][10][11][12]64]). …”

“…Recently, Aubourg et al [8] defined three magnetic windows where greigite (Fe 3 S 4 ; from subsurface to ~8 km of depth, i.e., up to ~200 °C), magnetite (Fe 3 O 4 ; ~2 to ~12 km of depth, i.e., ~50 to ~300 °C) and pyrrhotite (Fe 7 S 8 ; >8 km of depth, i.e., >200 °C) formed successively from low to deep burial by considering a geothermal gradient of 25 °C/km, which is typical in a foreland context. Thus, the magnetic assemblage of argillaceous rocks can be used to assess burial conditions and, particularly, burial temperatures (e.g., [9][10][11][12]). For high temperatures, the formation of pyrrhotite at the expense of magnetite and pyrite is reported by several studies when approaching 200 °C [3,4,13,14].…”

A Deep Alteration and Oxidation Profile in a Shallow Clay Aquitard: Example of the Tégulines Clay, East Paris Basin, France

“…About 700 m of Late Cretaceous chalk and Tertiary sediments were crosscut by drilling at Poigny, southeast of Paris [36], and 700 m is also the thickness evaluated in the Brie Plaine [33] or in Champagne [35], 600 m in the eastern Paris Basin [37], and 400 ± 300 m in south-eastern Paris Basin [38]. Thermal models indicate thickness of 300-350 m of Late Cretaceous chalk near Troyes based on fluid inclusion microthermometry [39] and 400-600 m near Saint Dizier based on organic matter [40].…”

“…Thermal models indicate thickness of 300-350 m of Late Cretaceous chalk near Troyes based on fluid inclusion microthermometry [39] and 400-600 m near Saint Dizier based on organic matter [40]. Assuming a thickness of about 300-600 m of sediments overlying the Gault clay and a surface temperature of ∼ 23 ± 2 ∘ C [37], the maximum burial temperature did not exceed [30][31][32][33][34][35][36] ∘ C. During the Late Tertiary and Quaternary most of the continent emerged, and the disappearance of the sea influence induced general climatic cooling. During the Quaternary the glacial and interglacial periods alternated and influenced erosion and weathering processes.…”