Calculation of Vitrinite Reflectance from Thermal Histories and Peak Temperatures

Geochemical and Sedimentation History of Neogene Lacustrine Sediments from the Valjevo-Mionica Basin (Serbia)

“…The minimum temperature necessary for catagenetic generation of hydrocarbons (temperature = depth x geothermal gradient + annual mean surface temperature; Suggate, 1998) was calculated at 103 °C (t = 2.3 x 40 + 11 = 103 °C). Using the basin-independent equation T = (lnRo+1.68)/0.0124 (Barker & Pawlewicz, 1994), and Ro value of 0.70 % is estimated to be at 107 ºC. Estimated temperature of hydrocarbons generation and necessary depth are in good agreement with corresponding data for the active source rocks in the region (Dragaš et al, 1991;Jovančićević et al, 2002;Kostić, 2010;Mrkić et al, 2011).…”

Thermal history of the Sabero Coalfield (Southern Cantabrian Zone, NW Spain) as revealed by apatite fission track analyses from tonstein horizons: implications for timing of coalification

“…The temperature range of this Permian constraint was drawn wider than the temperature calculated from R r , because the latter is not very precise (e.g. Barker and Pawlewicz 1994;Sweeney and Burnham 1990) (Fig. 3).…”

“…Vitrinite reflectance continues to increase progressively with increasing temperature, allowing maximum palaeotemperatures to be directly estimated (e.g. Barker and Pawlewicz 1994;Sweeney and Burnham 1990) in the range where the fission tracks in apatite are totally annealed and therefore where AFT data only provides minimum estimates. Arne and Zentilli (1994) managed to relate specific R r values to the corresponding annealing of AFTs.…”

“…According to different proposed methods, the measured R r values were translated into maximum palaeotemperatures. Barker and Pawlewicz's (1994) method indicated temperatures of 126-151 °C for (Donelick et al 2005) ); N d , numbers of counted tracks. Dispersion in age is showed in % and illustrate dispersion obtained ages analysed apatite.…”

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

“…The chemical kinetic model proposed by Sweeney and Burnham [70] cannot be used, because it is valid on a range of Ro between 0.3% and 4.5%. Barker and Pawlewicz [71] proposed an empirical calibration curve just as Vassoyevitch et al [40]. When using this calibration, a burial temperature about 30-40 °C higher than that given by the Vassoyevitch et al [40] calibration is estimated, i.e., also coherent with a burial temperature < 350 °C, suggested by the observation of the magnetic assemblage (magnetite and pyrrhotite).…”