Abstract

An extended and improved model of the origin and evolution of marginal seas in the strike-slip megazone due to the lateral interaction of the Eurasian and Pacific lithospheric plates is proposed. In the megazone, fragmentation of continental and oceanic plates, mantle upwelling, and ascending and descending lithospheric seismic vortexes occur. As a proof of the validity of the proposed model, the paper presents data from factor analysis, results of gravity and termophysical modeling, an analysis of distributions of earthquake magnitudes in 3D space, and geochemical features of volcanism in the Sea of Japan and Sea of Okhotsk. Study of the variability of earthquake magnitudes for the Sea of Okhotsk region revealed traces of vortex processes in the circular orientation in the variability vectors of magnitudes in the subcrustal viscous layer and in the asthenosphere. The head of the mantle plume has a typical mushroom shape, and its central trunk extends into the mantle below a depth of 200 km. Studies of the isotopic age and geochemical features of volcanic rocks in the Sea of Okhotsk and Sea of Japan have allowed researchers to identify the magma sources—lithospheric, asthenospheric, and subasthenospheric (plume); to trace the geochronological sequence in the ascent of mantle substrate; and to determine the underlying formation mechanisms for the marine basins. The origin of marginal seas is discussed and compared to other geodynamic models with different geotectonic paradigms. The origin of marginal seas is discussed and compared with other geodynamic models of different geotectonic paradigms.

中文翻译：

---

西太平洋边缘海形成模型：涡旋地球动力学，地震活动和地幔上升

摘要

由于欧亚大陆和太平洋岩石圈板块的横向相互作用，提出了一个扩展和改进的走滑巨带边缘海起源和演化的模型。在巨型区域，大陆和海洋板块破碎，地幔上升流，以及岩石圈地震涡的上升和下降。为了证明该模型的有效性，本文提供了来自因子分析，重力和热物理建模结果，3D空间中地震震级分布分析以及日本海和日本海火山活动的地球化学特征的数据。鄂霍次克。对鄂霍次克海地区地震震级变化的研究表明，在壳下粘性层和软流圈的震级变化矢量中，圆形方向上有涡旋过程的痕迹。地幔柱的头部呈典型的蘑菇形，其中央树干延伸到地幔下方200公里处。对鄂霍次克海和日本海中火山岩的同位素年龄和地球化学特征的研究使研究人员能够确定岩浆来源-岩石圈，软流圈和亚软流圈（软岩）。追踪地幔上升过程中的地球年代顺序；并确定海盆的潜在形成机制。讨论了边缘海的起源，并将其与具有不同大地构造范式的其他地球动力学模型进行了比较。对边缘海的起源进行了讨论，并将其与不同大地构造范式的其他地球动力学模型进行了比较。