Estimation of maximum temperature of mudstone by two kinetic parameters; epimerization of sterane and hopane |
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Authors: | Noriyuki Suzuki |
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Institution: | Department of Geology, Faculty of Science, Shimane University, Nishikawatsu, Matsue, Shimane, 690 Japan |
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Abstract: | A geochemical method for estimation of the maximum temperature of mudstones is proposed. The extents of epimerization of the sterane and the hopane are used. The temperature function is: where U = ln (1 ? α/0.54), V = ln(1 ? β/0.61), α = 20S-/20S- + 20R-24-ethyl-5α(H), 14α(H), 17α(H)-cholestane(C29-sterane) and β = 22S-/22S- + 22R-17α(H), 21β(H)-bishomohopane(C32-hopane). The value of dU/dV can be obtained from the tangent to the evolution curve in the UversusV. This temperature function is applicable to the temperature analysis in the range of 50°C–150°C. |
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