Gneisses and granitoids of the basement of the Nepa-Botuoba anteclise: constraints for relation of the archean and paleoproterozoic crust in the boundary zone between Tungus superterrane and Magan terrane (South Siberian craton)-Reference-Cited by-同舟云学术

Gneisses and granitoids of the basement of the Nepa-Botuoba anteclise: constraints for relation of the archean and paleoproterozoic crust in the boundary zone between Tungus superterrane and Magan terrane (South Siberian craton)

Published:2024-09-11 Issue:4 Volume:32 Page:
ISSN:0869-5903
Container-title:Петрология
language:
Short-container-title:Petrologiâ

Author:

Turkina О. М.¹,Plyusnin A. V.²,Donskaya Т. V.³,Afonin I. О.⁴,Sanin S. S.⁵

Affiliation:

1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences

2. Tyumen State University

3. Institute of the Earth’s Crust, Siberian Branch of Russian Academy of Sciences

4. National Research Tomsk State University

5. Tyumen Industrial University

Abstract

The paper presents geochemical and geochronological data on gneisses and granitoids from three deep boreholes (Yalykskaya-4, Danilovskaya-532, Srednenepskaya-1) in the basement of the southwestern part of the Nepa-Botuoba anteclise. Based on U-Pb dating of zircon, three stages of granitoid magmatism were identified:∼2.8, 2.0 and 1.87 Ga. At ca. 2.8 Ga magmatic TTG protolith of biotite-amphibole gneisses (Yalykskaya-4 borehole) were formed, which represent the Mesoarchean crust and experienced thermal effects at the terminal Neoarchean (∼2.53 Ga), typical of the Tungus superterrane of the the Siberian craton. Biotite gneiss-granites (∼2.0 Ga) (Danilovskaya-532 borehole) correlating in age with the granitoids of the basement of the Magan terrane and the Akitkan fold belt, were derived from a metasedimentary source formed by the erosion of mainly rocks of the Paleoproterozoic juvenile crust. The 1.88 Ga A-type granite (Srednenepskaya-1 borehole) correspond to the main stage of post-collision granite magmatism within the South Siberian magmatic belt. The ca.2.8 Ga biotite-amphibole gneisses mark position of the eastern boundary of the Archean crust in the south part of the Tungus superterrane with the area of the Paleoproterozoic juvenile crust, separated by a transitional zone, which intruded by granites having intermediate isotopic characteristics. The isotopic composition of Paleoproterozoic gneisses and granitoids indicates that marginal south part of the Magan terrane bordering with the Tungus superterrane – includes blocks of both Archean and Paleoproterozoic crust showing similarity with the Akitkan fold belt and accretionary orogens. The final amalgamation of the Tungus superterrane with blocks of the eastern part of the Siberian platform basement correspond to milestone of 1.88 billion years.

Publisher

The Russian Academy of Sciences

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