Abstract
Article discus in detail a possibility of the Pb-Pb method to date the Neoproterzoic carbonates. The Pb-Pb method has been used to date the limestone of the Agarin-gol Formation. U-Pb system was studied in carbonate samples which conformed by geochemical criteria of retention (Mg/Ca, Mn/Sr, Fe/Sr and 87Sr/86Sr) and have undergone by step-dissolution procedure. In 206Pb/204Pb – 207Pb/204Pb coordinates, age of the Agarin-gol limestone is to 621±93 Ma, MSWD = 1.3. This age is consistent with the Ediacaran age established on the basis of the Sr isotope chemostratigraphy (87Sr/86Sr = 0.70740-0.70748). New data allows to specify sedimentation age of carbonate sediments, which is Vendian-Cambrian stage of the Tuva-Mongolian Massif.
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