The Tectonic Evolution and Provenance of the Lower Paleozoic Terrigenous Rocks of the Omulevka and Rassokha Terranes, Northeast Russia.

This paper presents the data on the geological structure of the Lower Paleozoic complexes of the Omulevka and Rassokha terranes, which occur in the western part of the Kolyma–Omolon microcontinent. The Lower Paleozoic rocks of both terranes are mostly terrigenous and terrigenous-volcanic, respectively. The U–Pb dating of detrital zircons allowed the determination of the provenances of clastic material and paleogeographical position of terranes for the Early Paleozoic. The age of detrital zircons indicates that the main sources of clastic material for the Ordovician–Silurian sedimentary rocks of the Omulevka Terrane were located at the northern and northeastern passive margin of the Siberian Craton. For the entire Early Paleozoic, the Rassokha Terrane occurred close to a northeastern margin of Laurentia and the northwestern margin of Baltica. [ABSTRACT FROM AUTHOR]