Lithology and Formation Settings of the Pospelovo Formation in Southern Primorye: New Data

The results of the study and paleogeodynamic interpretation of the composition of sandy rocks of the Early–Middle Permian Pospelovo Formation, developed on the Muravyov–Amur Peninsula (Southern Primorye), are presented. The studies showed that, in terms of their parameters, sandstones are mainly lithic arenites and arcoses, which formed by the erosion and redeposition of significantly weathered parent rocks of the provenance areas. Interpretation of all the data obtained indicates that in the Early to Middle Permian, sedimentation occurred in basins in a passive continental margin. The main source of the clastic material was the continental landmass—uplifted basement blocks composed of acidic granite-metamorphic complexes and, partly, sedimentary rocks enriched with ancient clastic components. The presence of a small amount of femic heavy minerals in the sandstones also indicates the participation of areas of erosion of mafic and ultramafic rocks.