The Petro- and Paleomagnetic Characteristics of Gabbrodiorites from the Lower Amur Complex of the Zhuravlevka-Amur Terrane (the Sikhote-Alin Orogenic Belt)

Research reveals that the Amur River zone, part of the Zhuravlevka-Amur terrane in the Sikhote-Alin Orogenic Belt, underwent a significant counterclockwise rotation exceeding 20° relative to the Eurasian continent during the Cenomanian-Turonian period (approximately 100-94 million years ago). This finding challenges previous assumptions about latitudinal stability and suggests that left-lateral strike-slip fault systems, including the Amur and Central Sikhote-Alin faults, played a crucial role in tectonic movements. The study utilized petro- and paleomagnetic analyses of phase-I gabbrodiorites from the Lower Amur Complex to reconstruct the zone's position and rotational history. These insights provide a framework for understanding mantle material supply channels during the formation of significant porphyry copper deposits, such as the Malmyzh deposit, which is part of the Lower Amur mineragenic zone.

Didenko, A. N., Arkhipov, M. V., Taltykin, Yu. V., Krutikova, V. O., & Konovalova, E. A. (2023). The Petro- and Paleomagnetic Characteristics of Gabbrodiorites from the Lower Amur Complex of the Zhuravlevka-Amur Terrane (the Sikhote-Alin Orogenic Belt). Russian Journal of Pacific Geology, 17(5), 457–474. https://doi.org/10.1134/s1819714023050020