Abstract—

The substantiation of age and formation conditions of the Yamato Rise sedimentary cover, the largest rise in the Sea of Japan, is presented. Six complexes of sedimentary deposits of different age and genesis were identified based on the results of petrographic and micropaleontological analysis. Complex 1 (continental) of tuffaceous–sedimentary deposits contains numerous freshwater diatoms and palynoflora, proving the lacustrine genesis and the Early Miocene age of sediments. The age of complexes 2–6 (marine) was established on the basis of studying marine siliceous microfossils (diatoms, radiolarians, and silicoflagellates) and spore-pollen assemblages. The marine sedimentation prevailed from the end of the Early Miocene and occurred under the different conditions—from coastal-marine to bathyal. However, islands covered with forest vegetation were preserved until the Pleistocene inclusive. The irregular sedimentation during the Early Miocene and Pleistocene was associated with indented relief and active tectonics, accompanied by volcanism. The similarity of the rock complexes of the large Yamato and Krishtofovich rises (Ulleung Plateau) in age and genesis indicates the general trend of evolution of these rises, closely related to the formation of the Sea of Japan.

中文翻译：

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日本海大和隆起新生代沉积盖的年龄和形成条件

摘要—

介绍了日本海最大的大和上升沉积盖的年龄和形成条件的证实。根据岩石学和微古生物学分析的结果，确定了六种不同年龄和成因的沉积物复合物。凝灰岩-沉积沉积物的复合体1（大陆）包含大量的淡水硅藻和古生物，证明了湖相的成因和沉积物的中新世早期。在研究海洋硅质微化石（硅藻，放射虫和硅鞭毛虫）和孢粉组合的基础上，确定了2-6岁（海洋）的年龄。海洋沉积从中新世早期开始盛行，发生在从沿海海洋到深海的不同条件下。然而，保留着覆盖有森林植被的岛屿，直到包括更新世为止。中新世和更新世早期的不规则沉积与凹陷的浮雕和活跃的构造有关，并伴有火山作用。大和号和克里希托福维奇大隆起（Ulleung高原）的岩石复合物的年龄和成因的相似性表明，这些隆起的总体发展趋势与日本海的形成密切相关。