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北冰洋在过去的5500万年中的张开,导致了美洲板块相对於欧亚板块的旋转运动,旋转之极位於板块边界附近的西伯利亚东部。扩张着的板块边界深深插入了欧亚大陆的内部,直到旋转极为止。在极的另一侧,亦即板块边界的太平洋侧,沿库页岛和北海道记录到了挤压构造。从渐新世到中中新世,虽然旋转极的位置与现今并没有明显的差异,但相对运动却受看库页岛和北海道沿线走向滑运动的调节。本文用美洲板块最南端单独向太平洋边界(一自由边界)所作的运动来解释上述现象。该向洋方向的运动导致了美洲板块的扩张,后者又导致了鄂霍茨克海楔形构造的形成。日本海作为沿走向滑动边界的拉离盆地而张开,鄂霍茨克海的不断扩张最终又导致了千岛洋盆的张开。
The opening of the Arctic Ocean for the past 55 million years has led to the rotational movement of the Americas Plate relative to the Eurasian plate, with the most extreme rotation being east of Siberia near the plate boundaries. The expanded plate boundaries were deeply embedded in the interior of Eurasia until it was spinning. On the other side of the pole, the Pacific side of the plate boundary, compression structures were recorded along Sakhalin and Hokkaido. From Oligocene to Middle Miocene, although the position of pole of rotation is not obviously different from today, the relative movement is regulated by the slippery movement along Sakhalin Island and Hokkaido. This paper explains the above phenomenon by using the separate movement to the Pacific Ocean (a free boundary) at the southernmost tip of the Americas Plate. This oceanic movement led to the expansion of the Americas Plate, which in turn led to the formation of the Okhotsk Sea Wedge. The Sea of Japan opened up as a pull-off basin that moved towards sliding boundaries, and the continuous expansion of the Sea of Okhotsk eventually led to the opening of the Thousand-Islet Ocean.