A model of the geological evolution of the Japan and Okhotsk seas was developed based on radioisotope age, mineralogical, and isotope-geochemical study of the Late Mesozoic–Cenozoic volcanic rocks. The geodynamic settings of volcanic stages were determined as follows: (1) the Late Cretaceous continental-margin (calc-alkaline), (2) the Eocene transform-margin (adakite) in the Sea of Okhotsk, (3) the Miocene–Pliocene marginal sea (alkaline basaltic) in the Sea of Japan, and (4) the Pliocene–Pleistocene island arc (calc-alkaline) in the southern Sea of Okhotsk. It has been established that parental magmas were derived from subcontinental lithosphere, oceanic asthenosphere, and lower-mantle plume-continental (CAB) and plume-oceanic (OIB) sources. Geodynamic settings changed from the Late Cretaceous subduction to the Maastrichtian–Pliocene transform margin. The transform margin setting involved destruction and extension, maximum oceanic-margin spreading (end of the Early Miocene–beginning of the Middle Miocene), and post-spreading lower mantle plume upwelling (the Middle Miocene – Pliocene). It was completed by the resumption of the Pliocene–Pleistocene subduction of the Pacific plate beneath the Eurasian continent.

中文翻译：

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日本海和鄂霍次克海的火山和地球动力学的中，新生代晚期

日本和鄂霍次克海的地质演化模型是根据晚中生代-新生代火山岩的放射性同位素年龄，矿物学和同位素-地球化学研究而开发的。确定火山阶段的地球动力学设置如下：（1）白垩纪晚期大陆边缘（钙碱性），（2）鄂霍次克海始新世转变边缘（赤铁矿），（3）中新世—上新世日本海的边缘海（碱性玄武岩），和（4）鄂霍次克海南部的上新世-更新世岛弧（钙碱性）。已经确定，父母的岩浆来自于陆下岩石圈，海洋软流圈，下地幔羽-陆（CAB）和羽-洋（OIB）源。地球动力学背景从晚白垩纪俯冲转变为马斯特里赫特一上新世转变边缘。转换边缘的设置包括破坏和扩展，最大的海洋边缘扩展（中新世初期-中新世初）和下地幔柱上升后扩展（中新世-上新世）。它是通过恢复欧亚大陆下太平洋板块的上新世-更新世俯冲而完成的。