Transition from rifted continental to oceanic crust at the southeastern Korean margin in the East Sea (Japan Sea)
Transition from rifted continental to oceanic crust at the southeastern Korean margin in the East Sea (Japan Sea)
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DOI：
10.1029/2003gl019107
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发表时间：
2004-04-03
影响因子：
5.2
通讯作者：
Baag, CE
中科院分区：
文献类型：
--
作者：
Cho, HM;Kim, HJ;Baag, CE
朝鲜东南部边缘记录了大陆裂谷和海底扩张的过程，最终导致了东海南部（日本海）的开放。根据海底地震仪数据，通过层析反演和迭代正演模拟计算了朝鲜东南部边缘的二维地壳结构。地壳结构显示，在大陆架和陆坡区之下，下地壳以高速（> 7公里/秒）侵位，并伴随着从断裂大陆地壳向大洋地壳的快速过渡。下地壳的高速被解释为裂谷过程中大量的岩浆活动形成的岩浆底侵。磁模拟证实了其主要的相关性与一个突出的磁异常沿着边缘的朝鲜半岛。我们认为，在朝鲜边缘的裂谷和随后的海底扩张显着控制的岩浆在一个地区的温度高于正常地幔温度的供应。
The southeastern Korean margin documents the processes of continental rifting and seafloor spreading that eventually led to the opening of the southern part of the East Sea (Japan Sea). Two-dimensional crustal structure of the southeastern Korean margin was computed from ocean bottom seismometer data by tomographic inversion and iterative forward modeling. The crustal structure shows the emplacement of high-velocity (> 7 km/s) lower crust under the continental shelf and slope area associated with a rapid transition from rifted continental to oceanic crust. The high-velocity lower crust is interpreted as magmatic underplating formed by voluminous igneous activity during rifting. Magnetic modeling confirms its primary correlation with a prominent magnetic anomaly along the edge of the Korean Peninsula. We suggest that the rifting and subsequent seafloor spreading at the Korean margin was significantly controlled by the supply of magma in a region of hotter than normal mantle temperature.