Lithogeochemistry of Upper Precambrian terrigenous rocks of Belarus. Communication 2. Provenance, paleogeodynamics, paleogeography, paleoclimate

This publication completes the consideration of the lithogeochemical features study of a pilot collection of the Riphean and the Vendian sandstones, siltstones and mudstones (last one identified based on the interpretation results) of the Belarus. Data on the age of detrital zircon published in recent years suggest that the source rocks for the Upper Precambrian deposits of this region were the Osnitsk-Mikashevichi and the Trans-Scandinavian igneous belts, the Volyn-Brest large igneous province, rapakivi granites, as well as various associations of rocks of Sarmatia, the Danopolonian orogen and Svecofennides. The distribution of clastic rocks data points of our collection on provenance, paleogeodynamic, paleogeographic and paleoclimatic discriminant diagrams, which based mainly on the lithogeochemical composition, allows us to draw a number of conclusions. We are considering that the Riphean and the Vendian strata of the Belarus are composed mainly of intraplate granitoids erosion products, as well as various felsic igneous rocks of island-arc and syncollisional genesis. The part of mafic rocks erosion products among them generally does not exceed 30%. It`s noticeable mainly in rocks of the Volyn series (products of the Volyn-Brest large igneous province erosion), as well as in some samples of the Nizov, Selyavy and Kotlin formations (fragments of mafic rocks from other sources?). Source to sink transporting was carried out mainly by large rivers. Paleogeodynamic settings varied from quite active to quite passive. The paleoclimate in the Riphean was most likely arid/semiarid, and in the Vendian it was humid, from subtropical in the early (except for the Glussk Formation) to tropical in the Late Vendian. The research results also make it possible to show some work features for known paleoclimate reconstruction methods and techniques.