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Structure and Evolution of the Lithosphere in the Ocean-Continent Transition Zone.

大洋-大陆过渡带岩石圈的结构与演化。

基本信息

批准号：
04402011
负责人：
ASANUMA Toshio
金额：
$ 16万
依托单位：
Chiba niversity
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04402011/
关键词：
Tsushma Basin Yamato Basin Kita-oki Bank crustal structure Ocean bottom seismometer Yamato Bank ocean bottom electro-magnetometer three copnent magnetometer 北隠岐碓海底磁力計大和碓制御地震

项目摘要

We studied structure and evolution of the Lithosphere in the ocean-continent boundary zne in the southwestern part of the Japa Sea. We conducted a geohysical experiment in the Tsushima basin including seismic and geomagnetic measurements in 1992. An analysis f the data revealed the crusta and uppermost mantle structure in the Tsushima and Yamato basins and the northern part of the Kita-oki bank. Te Tsushima basin has a similar crust t that in the Yamato basin : both basins have a 14-km-thick crust, which is twice as thick as an average oceanic crust. On the contrary, the transition zone from the Ts4sh50a bas5n t6 the Ya0at6 bas5n, where 5s a sha336w water between the Yamato banks, has a 24-km thick crust. The veocity distribution in the crust indicates a continental characteristic including a 6-km/s layr. Electromagnetic observation using three ocean bottom electro-magnetometers resulted in that the specific electric resistance beneath the Tsushima Basin is less than that beneath the Japanese Islands and the Koren Penisula mainly due t presence of a lot o free water in the crust and that there needs no conducte in the upper mantle shallower than 160km taking the first dimensional mdelling into account.

本文研究了日本海西南部洋陆边界区岩石圈的结构和演化。1992年，我们在对马盆地进行了一次地球物理实验，包括地震和地磁测量。对这些数据的分析揭示了对马盆地和大和盆地以及北冲海岸北方部分的地壳和上地幔结构。对马盆地的地壳与大和盆地相似：两个盆地都有14公里厚的地壳，是平均洋壳厚度的两倍。相反，Ts 4sh 50 a盆地到Ya 0at 6盆地的过渡带，在大和两岸之间的5s a sha 336 w水，有24 km厚的地壳。地壳中的速度分布显示出大陆特征，包括6 km/s的层。用三台海底电磁仪进行的电磁观测表明，对马盆地的比电阻小于日本列岛和朝鲜半岛，这主要是由于地壳中存在大量的自由水，而在考虑一维模型的情况下，浅于160 km的上地幔中不存在导体。