ancient platform

Features of precambrian metamorphism and their relation to tectonics

The Early Precambrian stratigenic basement formations of ancient platforms are distinguished by their all-present metamorphism and the presence of monofacial (areal) and polyfacial (zonal) metamorphic complexes. Areal complexes are only often found in the basement of Epikarelian kratons, while the zonal complexes were also known to occur in Neogeos structures.

“Geodynamics” and early Precambrian geology of the shields of ancient platforms

The term “geodynamics” in the context of the tectonics of lithospheric plates, as well as the concept of neo-mobilism as a whole, cannot be used for the study of the formative conditions of the early Precambrian basement of the shields of ancients platforms. Other known definitions need to be used with respect to Early Precambrian. To reasoning that the paper demonstrates the major structural-material specifics of shields which confirm that they were formed in geodynamic conditions other that neogey, during an interval over 4000 to 1900–1600 million years ago.