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Segmental closure of the Mongol-Okhotsk Ocean: insight from detrital geochronology in the East Transbaikalia Basin


Arzhannikova, AV and Demonterova, EI and Jolivet, M and Mikheeva, EA and Ivanov, AV and Arzhannikov, SS and Khubanov, VB and Kamenetsky, VS, Segmental closure of the Mongol-Okhotsk Ocean: insight from detrital geochronology in the East Transbaikalia Basin, Geoscience Frontiers, 13, (1) Article 101254. ISSN 1674-9871 (2022) [Refereed Article]

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DOI: doi:10.1016/j.gsf.2021.101254


The Late Paleozoic–Early Mesozoic Mongol-Okhotsk Ocean extended between the Siberian and Amur–North China continents. The timing and modalities of the oceanic closure are widely discussed. It is largely accepted that the ocean closed in a scissor-like manner from southwest to northeast (in modern coordinates), though the timing of this process remains uncertain. Recent studies have shown that both western (West Transbaikalia) and eastern (Dzhagda) parts of the ocean closed almost simultaneously at the Early–Middle Jurassic boundary. However, little information on the key central part of the oceanic suture zone is available. We performed U-Pb (LA-ICP-MS) dating of detrital zircon from well-characterized stratigraphic sections of the central part of the Mongol-Okhotsk suture zone. These include the initial marine and final continental sequences of the East Transbaikalia Basin, deposited on the northern Argun-Idemeg terrane basement. We provide new stratigraphic ages for the marine and continental deposits. This revised chronostratigraphy allows assigning an age of ∼165–155 Ma, to the collision-related flexure of the northern Argun-Idemeg terrane and the development of a peripheral foreland basin. This collisional process took place 5 to10 million years later than in the western and eastern parts of the ocean. We demonstrate that the northern Argun-Idemeg terrane was the last block to collide with the Siberian continent, challenging the widely supported scissor-like model of closure of the Mongol-Okhotsk Ocean. Different segments of the ocean closed independently, depending on the initial shape of the paleo continental margins.

Item Details

Item Type:Refereed Article
Keywords:detrital zircon U-Pb geochronology, Mongol-Okhotsk collision, East Transbaikalian Basin
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Inorganic geochemistry
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:145023
Year Published:2022 (online first 2021)
Web of Science® Times Cited:10
Deposited By:CODES ARC
Deposited On:2021-06-24
Last Modified:2021-09-06
Downloads:18 View Download Statistics

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