PB-PB ISOCHRON AGE AND SR-ISOTOPIC SIGNATURE OF THE UPPER YUDOMA CARBONATE SEDIMENTS (VENDIAN OF THE YUDOMA-MAYA TROUGH, EASTERN SIBERIA)

Abstract

The carbonate rock investigation was based on the combined analysis of U-Pb- and Rb-Sr-systematism for the same samples. For the first time in the practice of studying the Upper Yudoma carbonate rocks of Eastern Siberia obtained is methodically reliable estimate of their Pb-Pb isochronous age, conforming to the stratigraphic location of the Yudoma-Maya trough and the basic ratio 87Sr/ 86Sr in these carbonates is determined, that characterizes Sr isotopic composition in Late Vendian ocean.