Empirical Calibration for Dolomite Stoichiometry Calculation: Application on Triassic Muschelkalk- Lettenkohle Carbonates (French Jura)

Empirical Calibration for Dolomite Stoichiometry Calculation: Application on Triassic Muschelkalk-Lettenkohle Carbonates (French Jura) — This study concerns an approach for dolomite quantification and stoichiometry calculation by using X-ray diffractometry coupled with cell and Rietveld refinements and equipped with a newly substantial database of dolomite composition. A greater accuracy and precision are obtained for quantifying dolomite as well as other mineral phases and calculating dolomite stoichiometry compared to the classical “Lumsden line” and previous methods. The applicability of this approach is verified on dolomite reference material (Eugui) and on Triassic (Upper Muschelkalk-Lettenkohle) carbonates from the French Jura. The approach shown here is applicable to bulk dolostones as well as to specific dolomite cements and was combined with petrographical and isotopic analyses. Oil & Gas Science and Technology – Rev. IFP Energies nouvelles, Vol. 67 (2012), No. 1, pp. 77-95 Copyright © 2012, IFP Energies nouvelles DOI: 10.2516/ogst/2011173 Diagenesis Fluid-Rocks Interactions Diagenèse minérale Équilibres fluides-roches Do s s i e r ogst110007_Turpin 13/03/12 15:59 Page 77