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Raman microspectroscopy, bitumen reflectance and illite crystallinity scale: comparison of different geothermometry methods on fossiliferous Proterozoic sedimentary basins (DR Congo, Mauritania and Australia)
Baludikay, B.K.; François, C.; Sforna, M.C.; Beghin, J.; Cornet, Y.; Storme, J.-Y.; Fagel, N.; Fontaine, F.; Littke, R.; Baudet, D.; Delvaux, D.; Javaux, E.J. (2018). Raman microspectroscopy, bitumen reflectance and illite crystallinity scale: comparison of different geothermometry methods on fossiliferous Proterozoic sedimentary basins (DR Congo, Mauritania and Australia). Int. J. Coal. Geol. 191: 80-94. https://dx.doi.org/10.1016/j.coal.2018.03.007
In: International Journal of Coal Geology. Elsevier: Amsterdam. ISSN 0166-5162; e-ISSN 1872-7840, meer
Peer reviewed article  
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Trefwoord
    Marien/Kust
Author keywords
    Raman microspectroscopy; Proterozoic organic-walled microfossils;Thermal history; Raman and bitumen reflectances; Illite crystallinity
Auteurs  Top 
  • Littke, R.
  • Baudet, D., meer
  • Delvaux, D., meer
  • Javaux, E.J., meer
Abstract
    Sedimentary rocks containing microfossils are crucial archives to reconstitute early life evolution on Earth. However, the preservation of microfossils within rocks depends on several physico-chemical factors. Among these factors, the thermal evolution of the host rocks can be decisive. Here, we investigated carbonaceous shale samples containing exquisitely preserved organic-walled microfossils assemblages from three Proterozoic shallow marine sedimentary sequences: the Mbuji-Mayi Supergroup (Democratic Republic of Congo, Congo Basin), the Atar/El Mreiti Group (Mauritania, Taoudeni Basin) and the Kanpa Formation (Australia, Officer Basin). Thermal maturity of these rock samples is evaluated with Raman geothermometry, Raman reflectance, solid bitumen reflectance, illite crystallinity and Thermal Alteration Index. The comparison of results coming from these different techniques validates the use of Raman reflectance on Proterozoic carbonaceous material and especially for poorly-ordered carbonaceous material. We show that extracted kerogen (microfossils and amorphous organic material) is more accurate to estimate the thermal maturity of low-grade temperature Proterozoic sequences than kerogen in thin section. All techniques provide consistent range of temperatures except for Raman geothermometry, giving slightly higher estimates. Raman reflectance appears to be a fast, robust and non-destructive tool to evaluate the thermal maturity of poorly-organized carbonaceous material from Proterozoic rocks.
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