Paleomagnetic poles of the Mesozoic Pacific Plate

中生代太平洋板块的古磁极

• 批准号: 13640415
• 负责人: NAKANISHI Masao
• 金额: $ 2.24万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640415/
• 关键词: magnetic anomaly lineation; Mesozoic; spreading rate; skewness parameter; Pacific Plate; 磁気異常; 北西太平洋

The Mesozoic magnetic lineation map, which had been made by Nakanishi et al.(1992), was revised using available underway geophysical data. The magnetic lineations were improved in the following areas,(1) Ontong Java Plateau(2) Nova-Canton Trough(3) Japan, Izu-Ogasawara, and Mariana trenchesThe cruise in the southern Mariana Trench was conducted in 2002 October by R/V KAIREI to get geophysical data. The result of the cruise implies that the subducting plate at the trench is a part of the Pacific Plate, although it had been thought to be the other plate.The skewness parameters of magnetic anomaly lineations were determined in more detailed than previous works. The results exposed that the rotation of the microplate near Pacific-Farallon-Phoenix triple junction occurred and that the intra-plate volcanism occurred in Nauru Basin.The dependence of anomalous skewness on spreading rates was examined using magnetic data in the Gulf of Aden, where there is a slow spreading system. The result shows that the dependence is less effective for this study.

Nakanishi等人绘制的中生代磁性线理图。（1992），使用现有的正在进行的地球物理数据进行了修订。以下地区的磁线理得到改善：（1）Ontong Java高原（2）Nova-Canton海槽（3）日本、Izu-Ogasawara和Mariana海沟2002年10月，KAIREI号研究船在马里亚纳海沟南部进行了巡航，以获取地球物理数据。巡航的结果表明，海沟处的俯冲板块是太平洋板块的一部分，尽管它曾被认为是另一个板块。结果表明，太平洋-法拉隆-菲尼克斯三联点附近的微板块发生了旋转，瑙鲁盆地发生了板内火山活动，亚丁湾存在缓慢扩张系统，利用地磁资料研究了异常偏度对扩张速率的依赖性。结果表明，依赖性是不太有效的这项研究。

项目成果

Nakanishi Masao: "Topographic Expression of the Gulf of Aden Spreading System and its Tectonics : Hotspots-Ridge Interaction in Gulf of Aden"Eos.Trans.AGU. 82・47. F1217 (2001)

Masao Nakanishi：“亚丁湾扩张系统及其构造的地形表现：亚丁湾的热点-海脊相互作用”Eos.Trans.AGU（2001）。

Nakanishi Masao, H. Fujimoto, K. Tamaki, and K. Okino: "Magnetic and gravity anomalies of the slow-spreading system in the Gulf of Aden"Eos.Trans.AGU. 83/47. F1356-1357 (2002)

Nakanishi Masao、H. Fujimoto、K. Tamaki 和 K. Okino：“亚丁湾缓慢扩散系统的磁力和重力异常”Eos.Trans.AGU。

Nakanishi, Masao: "Topographic Expression of the Gulf of Aden Spreading System and its Tectonics: Hotspots-Ridge Interaction in Gulf of Aden"Eos. Trans. AGU. 82・47. F1217 (2001)

Nakanishi，Masao：“亚丁湾扩张系统的地形表现及其构造：亚丁湾的热点-海脊相互作用”Eos 82・47。