Mesozoic Sandstones and the Reconstruction of Tectonic Depositional Environments in the Bureya Sedimentary Basin in the Far East

摘要

The early Jurassic–Early Cretaceous tectonic environments were reconstructed for the first time on the basis of the study of sandstones from the Soloni–Urgal interfluve (Bureya sedimentary basin, Far East). The mineralogical-petrographic and lithochemical studies revealed that the sandstones are mostly quartz–feldspathic and feldspathic graywackes of acid composition with less common litites, graywacke arkoses, and arkoses. It was shown that the Lower–Middle Jurassic sediments were formed in active continental margin and continental volcanic arc settings, while the Upper Jurassic–Lower Cretaceous sediments were accumulated in a passive continental margin setting. Orogenic events in the Toarcian–Aalenian, Late Bajocian, and Late Oxfordian–Kimmeridgian led to sedimentation gaps.