EVENT BASIS OF NEOPROTEROZOIC STRATIGRAPHICAL SCALE FOR SIBERIA AND CHINA

Abstract

Synchronous occurrence of three large event borderlines at 1.100, 850, and 650 Ma in the Neoproterozoic is shown for the Siberian Platform in the northern part of the Central-Asian foldbelt and Chinese Platform. They separate stratigraphical subdivisions such as Mayan (Kerpylian, Lakhandinian), Baikalian, Vendian (Yudomian), with the consolidated blocks (platforms, microcontinents, and terranes) having specific structure and formation conditions. This suggests that the Siberian-Chinese region in the Neoproterozoic was a single macrostructure, whose rigid blocks were quite synchronously heaped and scattered. The mechanism governing these processes is associated with the galactic year, whose duration directively decreased in the Neogenic from 250 to 180 Ma. The event basis developed permits correction of regional schemes and the general stratigraphical scales of the Late Precambrian.