Email this article Age and tectonic setting of volcanic rocks of the Olov basin of the West Transbaikal Rift System
- Authors: Larin А.М.1, Кotov A.B.1, Salnikova E.1, Savatenkov V.M.2, Ivanova A.A.3, Velikoslavinskii S.D.4, Skovitina T.4, Muravieva L.4, Alexeev N.L.5
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Affiliations:
- Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
- Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences (IPGG RAS)
- Institute of Precambrian Geology and Geochronology Russian Academy of Sciences
- Institute of Geology and Geochronology of Precambrian RAS
- Karpinsky Russian Geological Research Institute, Russian Academy of Sciences
- Issue: Vol 525, No 1 (2025)
- Section: GEOLOGY
- Submitted: 23.06.2025
- Accepted: 22.07.2025
- Published: 20.08.2025
- URL: https://journal-vniispk.ru/2686-7397/article/view/297374
- ID: 297374
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Abstract
Geochemical and geochronological (zircon U-Pb ID-TIMS) studies of volcanic rocks of the Olovskaya Depression of the West Transbaikal Rift System within the western part of the West Stanovoy Superterrane of the Central Asian Fold Belt have been performed. It has been established that the age of volcanics of this depression is in the range of 178±5 – 177±5 Ma. Taking into account the results of earlier studies, this indicates the two pulses of continental volcanism (Early Middle Jurassic and Early Cretaceous) in different geodynamic settings in this region. The first pulse was revealed exclusively in the Olovskaya Depression, localized in the zone of the Mongol-Okhotsk suture, and is represented by differentiated basaltic trachyandesite-trachyrhyolite association of the adakite type, formed in a collisional geodynamic setting. The second is represented by a bimodal trachyandesite-basalt-trachyrhyolite association, the formation of which occurred under conditions of post-collisional continental rifting. The collision event is most likely associated with the closure of the central segment of the Mongol-Okhotsk Ocean and the collision of the continental masses of the North Asian and Sino-Korean continents at the turn of ~ 175 million years. The subsequent collapse of the collisional orogen was accompanied by large-scale lithospheric extension and rifting of Early Cretaceous age (~ 140 million years).
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About the authors
А. М. Larin
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Author for correspondence.
Email: larin7250@mail.ru
Russian Federation, St. Petersburg
Aleksandr B. Кotov
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
Email: abkotov-spb@mail.ru
Russian Federation, Saint-Peterburg
Ekaterina Salnikova
Email: katesalnikova@yandex.ru
Russian Federation
V. M. Savatenkov
Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences (IPGG RAS)
Email: v.m.savatenkov@ipgg.ru
ORCID iD: 0000-0003-3024-4164
Заведующий лабораторией геохронологии и геохимии изотопов, Старший научный сотрудник, Член НТС ЦКП
Russian FederationAnna Alexandrovna Ivanova
Institute of Precambrian Geology and Geochronology Russian Academy of Sciences
Email: anna_al_ivanova@mail.ru
ORCID iD: 0000-0001-8341-6690
SPIN-code: 6219-3631
Russia, Saint Petersburg
S. D. Velikoslavinskii
Institute of Geology and Geochronology of Precambrian RAS
Email: sd1949@yandex.ru
Russian Federation, St. Petersburg
Tatyana Skovitina
Email: log@crust.irk.ru
Lyubov Muravieva
Email: luba.muravyova@yandex.ru
N. L. Alexeev
Karpinsky Russian Geological Research Institute, Russian Academy of Sciences
Email: nikola.alekseev@gmail.com
Russian Federation, St. Petersburg, 199106
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