Raman spectroscopy of organic matter and rare minerals in the Klodawa Salt Dome (Central Poland) cap-rock and Triassic cover - Indicators of hydrothermal solution migration

摘要

The occurrence of organic matter (OM) in a salt dome cap-rocks is very rare in Zechstein formation in the Europe. Within the Klodawa Salt Dome (KSD) cap-rock and Triassic cover OM occur relatively often and it is accompanied by some rare minerals. The OM in cap-rocks occurs in two forms i.e. as a finely dispersed matter not recognizable in a microscopic image and as organic partides or small veins. Based on the Raman spectroscopy and measured reflectance both forms show similar thermal maturation but finely dispersed matter display higher variability. The temperature of the maturation reaches up to 220 degrees C and mostly is about 150 degrees C. Within the solid bitumen (SB) was also found OM partides which show thermal transformations above 300 degrees C.