ON THE INTRAPLATE FE-TI PICRITES AND BASA LTS AS AN EVIDENCE OF THE HETEROGENEOUS ACCRETION OF THE EARTH

Geochemically and isotopically enriched Fe-Ti picrites and basalts of normal, moderate and high alkalinity and associated Ti-bearing alkalin e rocks of K-Na and potassium rock series are considered as main melt types associated with the intraplate magmas. This magma type is assume d to be different from that associated with plate margins and related to abyssal mode of origin. These magmas are widely distributed in the Earth's crust in suits not older than of 2.2-2.0 Ga agu. The intraplat e picrites and basalts are practically absent in Archean and Lower Pro terozoic series the fatter being presented by depleted komatiites and even boninite-like rocks. Some analogy could be seen in the character of terrestrial and lunar magmatic series. The most ancient lunar conti nental rocks are presented with depleted low Ti-margins ANT rock serie s and high-alumina basalts whereas the high Ti-bearing mare basalts we re generated only 0.8-1.0 Ga later. The data on magmatic evolution ind icate the existence of two greatly different matter types in the infer iors of Earth and Moon. It is interpreted as an evidence of heterogene ous accretion of terrestrial planets.