Main stages of tectonomagmatic activity of the Tuva-Mongolian microcontinent in the Precambrian: data on the U-Pb age of zircons

Letnikova E F<sup>*</sup>; Shkolnik S I; Letnikov F A; Karakovskii E A; Kostitsyn Yu A; Vishnevskaya I A; Reznitskii L Z; Ivanov A V; Prochenkin A I

doi:10.1134/S1028334X17060113

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Main stages of tectonomagmatic activity of the Tuva-Mongolian microcontinent in the Precambrian: data on the U-Pb age of zircons

作者：Letnikova E F^*; Shkolnik S I; Letnikov F A; Karakovskii E A; Kostitsyn Yu A; Vishnevskaya I A; Reznitskii L Z; Ivanov A V; Prochenkin A I

来源：Doklady Earth Sciences, 2017, 474(2): 668-673.

DOI：10.1134/S1028334X17060113

摘要

The U-Pb age of zircons from Ediacaran sandstones of the cover of the Tuva-Mongolian microcontinent and the rocks of its Early Precambrian basement (Gargan block) was analyzed by the LA-ICP-MS method. The major stages of tectonomagmatic activity of this block include the Neoarchean, Paleoproterozoic (no younger than 2 Ga), and Neoproterozoic. Comparison of the age of zircons from Ediacaran terrigenous rocks of the Tuva-Mongolian microcontinent and sandstones of the reference sections of the Ediacaran shelf of the Siberian platform undeniably indicates their independent accumulation.