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[36930] Artykuł: Vitrinite equivalent reflectance of Silurian black shales from the Holy Cross Mountains, PolandCzasopismo: Mineralogia Tom: 45, Zeszyt: 3-4, Strony: 79-96ISSN: 1899-8526 Opublikowano: 2014 Liczba arkuszy wydawniczych: 96.00 Autorzy / Redaktorzy / Twórcy
Grupa MNiSW: Pozostałe publikacje (niepunktowane) Punkty MNiSW: 0 DOI Keywords: Holy Cross Mountains  Lower Silurian  maturation  graptolite reflectance  black shales  |
A number of independent methods have been used to measure the thermal maturity of Silurian rocks from the Holy Cross Mountains in Poland. Black shales are characterized by diverse TOC values varying from 0.24-7.85%. Having calculated vitrinite equivalent reflectance using three different formulas, we propose that the most applicable values for the Silurian rocks are those based on Schmidt et al. (2015) equation. Based on this formula, the values range from % 0.71 VReqvVLR (the vitrinite equivalent reflectance of the vitrinite-like macerals) to % 1.96 VReqvVLR. Alternative, complementary methods including Rock Eval pyrolysis and parameters based on organic compounds (CPI, Pr/n-C17, Ph/n-C18, MPI1, and MDR) from extracts did not prove adequate as universal thermal maturity indicators. We have confirmed previous suggestions that Llandovery shales are the most likely Silurian source rocks for the generation of hydrocarbons in the HCM.