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1 引 言 朝鲜东海(即日本海)是一个被广泛研究的位于西北太平洋边缘的弧后盆地(图1)。关于日本海弧后张开方式的假说可归纳为:(1)与日本弧不同旋转有关的扇形张开(Oto-fuji等,1983;1985;Celara等,1987;Faure等,1987)。(2)沿西缘和东缘两条主走滑断层拉分张开(Lallemand等,1985;Kimara等,1986)。根据西南日本内的古地磁测量和日本盆地和大和盆地内的大洋钻探计划的结果,本文的修改模式把弧的转动与走滑剪切变形的背景结合了起来。 这些假说性复原表明,朝鲜的东部陆缘是一个构造上的关键区域,因为如果日本弧通过大陆裂谷作用和弧后扩张移离东亚大陆(Jolivet等,1992),它调节了明显的地壳变形。然
1 Introduction The East China Sea (the Sea of Japan) is a widely studied back-arc basin on the western North Pacific margin (Figure 1). Hypotheses about the post-oculus open-sea approach in Japan can be summarized as follows: (1) fan-shaped openness associated with different rotation of the Japanese arc (Oto-fuji et al., 1983; 1985; Celara et al., 1987; Faure et al., 1987). (2) Spread apart along two main strike-slip faults at the western and eastern margins (Lallemand et al., 1985; Kimara et al., 1986). Based on paleomagnetic measurements in Southwest Japan and ocean drilling programs in the Japanese Basin and the Yamato basin, the modified model in this paper combines the arc rotation with the background of the strike-slip shear deformation. These hypothetical recoveries suggest that North Korea’s eastern margin is a structurally crucial area because if the Japanese arc moved off the East Asian continent through continental rifting and backarc expansion (Jolivet et al., 1992), it adjusted for apparent crustal deformation . Of course