Evidence of a kinetic effect during the thermal decomposition of 40 mg of pure calcite decomposed with temperature gradients ranging from 2 to 30 °C min⁻¹. (A) Result with the Rock-Eval^® expressed in equivalent CO₂ as a function of the oven temperature. (B) Result of the TGA measurements expressed as a derivate of the weight as a function of the oven temperature. An increase in the maximum decomposition temperature is observed with increasing heating ramps.