Age of carbonate rocks of the agarin-gol formation (northern Mongolia): possibilities of Pb-Pb dating
DOI:
https://doi.org/10.21638/11701/spbu07.2017.205Abstract
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.
Keywords:
Pb-Pb age, limestones, Ediacaran, agarin-gol formation, Tuva-Mongolian massif
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Articles of "Vestnik of Saint Petersburg University. Earth Sciences" are open access distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution and self-archiving free of charge.