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

• Published in: Russian journal of Pacific geology 2023-10, Vol.17 (5), p.457-474
• Main Authors: Didenko, A. N., Arkhipov, M. V., Taltykin, Yu. V., Krutikova, V. O., Konovalova, E. A.
• Format: Article
• Language: English
• Subjects: Earth and Environmental Science; Earth Sciences; Geology; Palaeomagnetism; Paleomagnetism; Rivers; Strike-slip faults
• ISSN: 1819-7140; 1819-7159
• DOI: 10.1134/S1819714023050020

The results of petro- and paleomagnetic studies of phase-I gabbrodiorites from the Lower Amur Complex of the Zhuravlevka-Amur terrane (Poni massif, Poni-Mulinsky ore cluster) are presented. They were used to determine that during the formation of the Lower Amur intrusive complex (Cenomanian-Turonian) the Amur River zone was located approximately 10° north of its current position between the Central Sikhote-Alin fault in the east and the Priamursky fault in the west. It is shown that starting from the middle of the Cenomanian there were no latitudinal movements of the Amur River zone of the Zhuravlevka-Amur terrane relative to the Eurasian continent. However, a more than 20°-counterclockwise rotation of the zone relative to the continent was recorded, which is easily explained within the ball-bearing tectonic model under the impact of the Amur and Central Sikhote-Alin en echelon left-lateral strike-slip faults. The left-lateral strike-slip fault systems were likely to be the channels for mantle material supply during the formation of the largest Malmyzh porphyry copper deposit, which, along with the Poni-Mulinsky ore cluster, is part of the Lower Amur mineragenic zone.