Abstract
The paper presents the first findings of paleomagnetic studies on Middle Jurassic sedimentary rocks of the Elgon Formation of the Ulban Terrane from the coastal outcrops along the Ulban Bay (53.5° N, 137.7° E). Demagnetization yielded a ChRM component of the pre-folding age. No inclination shallowing effect for the ChRM vector was revealed in sandstone specimens of the Elgon Formation. The paleomagnetic pole coordinates and the paleolatitude at which the studied rocks deposited were calculated: Plat = –34.3 (34.3)°; Plong = 161.2 (341.2)°; dm = 2.7, dp = 5.3, paleolatitude = 0.1° (+2.7°/–2.6°) S. The acquired paleomagnetic data are evidence of the deposition of the rocks of the Ulban Terrane in the Middle Jurassic at the boundary between the Asian paleocontinent and the Paleo-Pacific, which later formed part of the Sikhote Alin Orogenic Belt.
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ACKNOWLEDGMENTS
The authors express their sincere gratitude to the reviewers V.Yu. Vodovozov and V.V. Golozubov whose useful remarks and suggestions improved the quality of the manuscript. Thanks are also due to S.V. Burya, E.Yu. Didenko, and O.M. Menshikova for technical support during the fieldwork and the manuscript preparation.
Funding
The studies were supported by the RFBR within the framework of research projects nos. 21-55-50001 and 18-35-00048.
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Peskov, A.Y., Kudymov, A.V., Zyabrev, S.V. et al. Paleomagnetism of the Middle Jurassic Sedimentary Rocks of the Elgon Formation of the Ulban Terrane. Russ. J. of Pac. Geol. 15, 175–187 (2021). https://doi.org/10.1134/S1819714021030052
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DOI: https://doi.org/10.1134/S1819714021030052