Isotope-geochemical features of Devonian rocks in the Pripyat Trough: Famennian suprasalt deposits

摘要

This work presents the results of isotope studies of the Upper Devonian (Famennian) suprasalt complex carried out with core material of exploratory borehole 71 drilled at the northwestern margin of the Pripyat Trough. Lithological features of the rocks point to a high degree of postsedimentary transformation of rocks. Significant role in these transformations was played by evaporites and related brines and the presence of hydrocarbons in the sequence. Such a combination provides insight into the behavior of isotope systems under conditions of the geochemical transformation of sedimentary material. The combined application of several isotope (δ^sup 13^C, δ^sup 18^O, δ^sup 34^S, and ^sup 87^Sr/^sup 86^Sr) methods made it possible to consider the complex mechanisms of compositional and isotopic transformation of rocks in the course of their lithogenetic alterations. The source material can be deduced with a high probability from the Rb-Sr systematics of the clayey component of marls.[PUBLICATION ABSTRACT]