Collision, rotation, and back‐arc spreading in the region of the Okhotsk and Japan Seas
Collision, rotation, and back‐arc spreading in the region of the Okhotsk and Japan Seas
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DOI：
10.1029/tc005i003p00389
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发表时间：
1986-06
期刊：
影响因子：
4.2
通讯作者：
G. Kimura;K. Tamaki
中科院分区：
文献类型：
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作者：
G. Kimura;K. Tamaki
晚始新世以来，印度-欧亚大陆碰撞导致了欧亚大陆的大规模变形。我们认为，弧后扩张在鄂霍次克海和日本海是有关的微板块的运动与印度-欧亚大陆碰撞。鄂霍次克海的千岛盆地和日本海的盆地同时形成为弧后盆地。晚渐新世至中新世中期的年龄受到沉积地层、基底深度和热流数据的制约。鄂霍次克板块和阿穆里亚板块的运动对鄂霍次克海和日本海的构造具有重要意义。两个微板块同时从海沟枢纽线后退，导致了千岛盆地和日本海的弧后扩张。由于印度-欧亚大陆的碰撞，阿穆里亚板块向北-东北方向移动。这导致贝加尔裂谷沿着西伯利亚板块和阿穆里亚板块之间的转换边界拉开，并在其北方边缘沿着斯塔诺托山脉发生碰撞。这一运动引发了鄂霍次克板块的顺时针旋转，并伴随着鄂霍次克板块和阿穆里亚板块之间的右旋碰撞，这在两个弧后板块之间的库页岛-北海道群岛的中心地带沿着被很好地观察到。鄂霍次克板块的顺时针旋转由千岛盆地的西南扇形开口所暗示。千岛盆地向东北方向变窄，终止于堪察加半岛南部，鄂霍次克和千岛弧前板块之间的相对旋转极位于该地区。堪察加半岛是在千岛盆地打开期间，位于顺时针旋转的鄂霍次克板块另一侧的碰撞区。堪察加半岛的斯列丁内山脉是鄂霍次克板块与千岛弧弧前板块碰撞的产物之一。日本诸岛的弯曲与日本海大和海盆的弧后扩张有关。
The India-Eurasia collision caused extensive deformation in the Eurasia Continent since late Eocene time. We propose that back-arc spreading in the Okhotsk and Japan Seas was related to the movement of microplates relevant to the India-Eurasia collision. The Kuril Basin of the Okhotsk Sea and the basins of the Japan Sea were formed as back-arc basins simultaneously. Their late Oligocene to middle Miocene age is constrained by sediment stratigraphy, basement depth, and heat flow data. The movements of two microplates, the Okhotsk and Amuria Plates, are significant for the tectonics of the Okhotsk and Japan Seas. Simultaneous retreat of both microplates from trench hinge lines caused back-arc spreading in the Kuril Basin and the Japan Sea. The Amuria Plate moved north-northeastward due to the India-Eurasia collision. This caused pull-apart opening of the Baikal Rift along a transform boundary between the Siberia and Amuria Plates and a collision along the Stanovoy Range at its northern margin. This movement triggered a clockwise rotation of the Okhotsk Plate with a component of dextral collision between the Okhotsk and Amuria Plates, which is well observed along the central zone of the Sakhalin-Hokkaido islands between the two back-arc plates. The clockwise rotation of the Okhotsk Plate is suggested by the southwestward fan-shaped opening of the Kuril Basin. The Kuril Basin narrows to the northeast and terminates south of the Kamchatka Peninsula, where a relative rotation pole between the Okhotsk and Kuril forearc plates is located. The Kamchatka Peninsula was a zone of collision on the other side of the clockwise rotating Okhotsk Plate during the opening of the Kuril Basin. The Sredinny Range in the Kamchatka Peninsula is one of the results of the collision between the Okhotsk Plate and the forearc plate of the Kuril Arc. The bending of the Japanese islands occurred in association with the back-arc spreading of the Yamato Basin of the Japan Sea.