фосфориты, систематика рзэ, нижний протерозой, рифей, эдиакарий, венд, кембрий, phosphorite, ree systematics, lower proterozoic, riphean, ediacarian, vendian, cambrian, Engineering geology. Rock mechanics. Soil mechanics. Underground construction, TA703-712

This publication provides an overview of the rare earth elements systematics in Pre-Ordovician phosphorites from various regions of the world. Based on the analysis of significant data bank it shows that currently there are no universal parameters, guided by which, could be more or less clearly to judge sedimentary and diagenetic environments of formation of phosphate rock in the first place - redox environments. Any reconstruction of this plan require a careful analysis of how the geological facts, and extensive and diverse geochemical information.