POSITION OF THE ANAI FORMATION IN THE PROTEROZOIC SECTION OF THE BAIKAL SALIENT OF THE SIBERIAN PLATFORM BASEMENT-Reference-Cited by-同舟云学术

POSITION OF THE ANAI FORMATION IN THE PROTEROZOIC SECTION OF THE BAIKAL SALIENT OF THE SIBERIAN PLATFORM BASEMENT

Published:2023-04-19 Issue:2 Volume:14 Page:
ISSN:2078-502X
Container-title:Geodynamics & Tectonophysics
language:
Short-container-title:Geodin. tektonofiz.

Author:

Efremova U. S.¹^ORCID,Donskaya T. V.¹^ORCID,Mazukabzov A. M.¹^ORCID,Gladkochub D. P.¹^ORCID,Khubanov V. B.²^ORCID

Affiliation:

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

2. Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences

Abstract

The paper presents the first U-Pb (LA-ICP-MS) dating results for detrital zircons from the quartzsericite-chlorite schist of the Anai formation within the Baikal salient of the Siberian platform basement. During the study the detrital zircons showed a major age peak at 1.86 Ga, which indicates that the rocks of the Anai formation were accumulated after the development of magmatic rocks of the South Siberian post-collisional magmatic belt with an age of 1.88‒1.84 Ga. This fact makes it possible to reconsider a point of view on the belonging of the Anai formation to the section of the Paleoproterozoic Sarma group whose rocks were intruded by granitoids of the South Siberian magmatic belt. It is shown that the rocks of the Anai formation can be considered as age and facial equivalents of the Proterozoic sediments of the Purpol formation of the Patom zone. Taking into account the Anai formation sediments intruded by sills and dikes of the Neoproterozoic (~720 Ma) dolerites, it can be concluded that the rocks of this formation were presumably accumulated in the Early Neoproterozoic time.

Publisher

Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences

Subject

Earth-Surface Processes,Geophysics,Geology,Economic Geology

Reference45 articles.

1. Aleksandrov V.K., Mazukabzov A.M., Boyko Yu.I., Bogarev G.A., Kalinina V.I., 1989. Anai Structure of the Western Baikal Region. Bulletin of the USSR Academy of Sciences. Geological Series 6, 71–79 (in Russian)

2. Bibikova E.V., Korikovsky S.P., Kirnozova T.I., Sumin L.V., Arakelyants M.M., Fedorovsky V.S., Petrova Z.I., 1987. Age Determination of Rocks from the Baikal-Vitim Greenstone Belt by Isotope-Geochronological Methods. In: Isotope Dating of the Processes of Metamorphism and Metasomatism. Nauka, Moscow, p. 154–164 (in Russian)

3. Buyantuev M.D., Khubanov V.B., Vrublevskaya T.T., 2017. U-Pb LA-ICP-MS Dating of Zircons from Subvolcanics of the Bimodal Dyke Series of the Western Transbaikalia: Technique, and Evidence of the Late Paleozoic Extension of the Crust. Geodynamics & Tectonophysics 8 (2), 369–384 (in Russian)

4. Cullers R.L., 2002. Implications of Elemental Concentrations for Provenance, Redox Conditions, and Metamorphic Studies of Shales and Limestones near Pueblo, CO, USA. Chemical Geology 191 (4), 305–327. https://doi.org/10.1016/S0009-2541(02)00133-X.

5. Donskaya T.V., 2020. Assembly of the Siberian Craton: Constraints from Paleoproterozoic Granitoids. Precambrian Research 348, 105869. https://doi.org/10.1016/j.precamres.2020.105869.