Opening of the Kuril Basin deduced from the magmatic history of Central Hokkaido, North Japan
Opening of the Kuril Basin deduced from the magmatic history of Central Hokkaido, North Japan
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从北日本北海道中部的岩浆历史推断出千岛盆地的开口
DOI：
10.1016/0040-1951(90)90324-2
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发表时间：
1990
期刊：
影响因子：
2.9
通讯作者：
J. Maeda
中科院分区：
文献类型：
--
作者：
J. Maeda
千岛盆地是太平洋西北缘的一个扇形弧后盆地。该盆地东南被太平洋的千岛岛弧所分隔，北以沉降的鄂霍托莫尔斯克地块为界，西以晚始新世至早中新世日高岩浆弧为界。构成晚白垩世至早始新世原千岛岛弧的碎屑沉积物是从鄂霍托莫尔斯克地块搬运来的，现今千岛岛弧位于其下。这表明千岛盆地并没有打开，原始千岛弧至少在始新世早期之前一直位于鄂霍托莫尔斯克地块的南缘。北海道中部的第三纪日高岩浆弧是沿着南北向俯冲带形成的，太平洋板块向欧亚板块俯冲。因此，当日高岩浆活动发生时，北海道中部以东的千岛盆地还没有出现。根据日高弧岩浆活动在17-16 Ma停止并沿着南北向伸展的事实，推测千岛盆地是在16 Ma后由原千岛弧-海沟系统向南退缩而打开的。根据A型岩浆活动和地堑状沉积盆地的出现，推测北海道中部中新世中期的伸展应力体制。这种应力场可以归因于太平洋板块沉降的退缩原千岛弧在千岛盆地的开放过程中。在千岛盆地崎岖的基底上出现的未变形的水平沉积盖层与16-15 Ma的快速开启相一致。在中中新世，千岛盆地和日本盆地是由类似的过程形成的，即，弧沟系统的旋转和向海洋的后退。两个弧后盆地沿着不同的板块边界张开，太平洋-北美边界的千岛盆地和太平洋-欧亚边界的日本盆地，可能是由一个热的地区跨越覆盖板块边界的迁移。
The Kuril Basin is a fan-shaped back-arc basin in the northwestern Pacific rim. The basin is separated by the Kuril arc from the Pacific Ocean to the southeast, and is bounded by the subsided Okhotomorsk Block to the north and by the Late Eocene to Early Miocene Hidaka magmatic arc to the west.The clastic sediments constituting the Late Cretaceous to Early Eocene Proto-Kuril arc, which underlies the modern Kuril arc, were transported from the Okhotomorsk Block; between them the Kuril Basin now intervenes. This suggests that the Kuril Basin had not opened and that the Proto-Kuril arc had been located in the southern margin of the Okhotomorsk Block at least until Early Eocene time. It also indicates that the Kuril Basin was not entrapped by the Proto- or modern Kuril arc.The Tertiary Hidaka magmatic arc in Central Hokkaido was formed along a N-S trending subduction zone where the Pacific plate was subducting beneath the Eurasian plate. Therefore, the Kuril Basin was not yet present on the east of Central Hokkaido during the period when the Hidaka magmatism was taking place. Based on the fact that the Hidaka arc magmatism ceased at 17-16 Ma and coevally along its N-S trending extension, it is suggested that the Kuril Basin opened just after 16 Ma by the southward retreat of the Proto-Kuril arc-trench system.In Central Hokkaido, an extensional stress regime during the Middle Miocene is inferred from the occurrence of A-type magmatism and graben-like sedimentary basins. This stress field can be attributed to subsidence of the Pacific slab covered by the retreated Proto-Kuril arc during the opening of the Kuril Basin. The occurrence of an undeformed and horizontal sedimentary cover on the rugged basement of the Kuril Basin is consistent with rather rapid opening at 16-15 Ma.During the Middle Miocene, the Kuril Basin and Japan Basin were formed by a similar process i.e., rotation and oceanward retreat of an arc-trench system. Opening of the two back-arc basins along different plate boundaries i.e., the Pacific-North American boundary for the Kuril Basin and the Pacific-Eurasian boundary for the Japan Basin, may have been caused by the migration of a hot region across the overriding plate boundary.
影响因子：
4.2
作者：
G. Kimura;K. Tamaki
通讯作者：
G. Kimura;K. Tamaki