Tectonics of triple junction at divergent plate boundaries.

不同板块边界处三联结的构造。

• 批准号: 16540376
• 负责人: NAKANISHI Masao
• 金额: $ 2.37万
• 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: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540376/
• 关键词: triple junction; spreading system; abyssal hills; bathymetry; magnetic anomaly lineation; mantle Bouguer anomaly; Pacific Plate; Indian Ocean; マントルプルーム

I studied the following triple junctions.1. Rodriguez Triple Junction (Indian Ocean)I made precise bathymetric, magnetic anomaly lineations, and residual mantle Bouguer gravity anomaly maps around the Rodriguez Triple Junction. I exposed the detailed tectonic history of the triple junction.2. Spreading system in the Gulf of Aden (Indian Ocean)I made precise bathymetric, and mantle Bouguer gravity anomaly maps around spreading system in the Gulf of Aden, which connects to the Afar Triple Junction. The maps show the detail topographic and crustal structures of the spreading system.3. Pacific-Izanagi-Farallon Triple Junction (Pacific Ocean)I exposed the triple junction trace of the Pacific-Izanagi-Farallon Triple Junction in Late Jurassic using the detailed bathymetric map as well as the revised magnetic anomaly lineation map. I revealed the tectonic history of the fracture zone born near the triple junction.4. Pacific-Farallon-Phoenix Triple Junction (Pacific Ocean)I exposed the tectonic evolution of the Manihiki Plateau that had been situated near the Cretaceous Pacific-Farallon-Phoenix Triple Junction from the detailed bathymetric map of the central part of the plateau.5. Pacific-Izanagi-Phoenix Triple Junction (Pacific Ocean)I revised the Mesozoic Pacific magnetic anomaly lineation map. The map gives me the information of the plate boundaries around the Pacific-Izanagi-Phoenix Triple Junction.

我研究了以下三重连接。1. Rodriguez Triple Junction（印度洋）我制作了Rodriguez Triple Junction周围精确的测深、磁异常线理和剩余地幔布格重力异常图。我揭示了三重结合的详细构造历史。亚丁湾（印度洋）扩张系统我在亚丁湾扩张系统周围制作了精确的测深图和地幔布格重力异常图，该扩张系统连接到阿法尔三联点。这些地图显示了扩张系统的详细地形和地壳结构。Pacific-Izanagi-Farallon三联点（太平洋）我利用详细的测深图和修订的磁异常线理图揭露了晚侏罗世Pacific-Izanagi-Farallon三联点的三联点痕迹。揭示了断裂带在三联点附近形成的构造历史.太平洋-法拉隆-菲尼克斯三联点（太平洋）我从高原中部的详细测深图中揭示了位于白垩纪太平洋-法拉隆-菲尼克斯三联点附近的马尼希基高原的构造演化。太平洋-Izanagi-Phoenix三联点（太平洋）我修订了中生代太平洋磁异常线理图。这张地图给了我太平洋-伊那木-菲尼克斯三联点周围的板块边界的信息。

项目成果

Tectonic Setting of the Danger Islands Troughs in the Manihiki Plateau

马尼希基高原危险群岛海槽的构造背景

• 发表时间: 2004
• 期刊: EOS Trans. AGU 85
• 作者: Nakanishi;M.
• 通讯作者: M.

An outline of the interdisciplinary survey on a new type intra-plate volcanism

新型板内火山作用跨学科研究概要

• 发表时间: 2005
• 期刊: Eos Transactions, American Geophysical Union 86・52
• 作者: N.Abe;N.Hirano et al.
• 通讯作者: N.Hirano et al.

Marine magnetic anomaly and magnetization of oceanic plate around the Japan trench in the northwestern Pacific

西北太平洋日本海沟周围海洋磁异常和海洋板块磁化

• 发表时间: 2005
• 期刊: EOS Trans.AGU 86
• 作者: Fujiwara;T.
• 通讯作者: T.

Depleted mantle wedge and sediment fingerprint in unusual basalts from the Manihiki Plateau, central Pacific Ocean

• DOI: 10.1130/g23741a.1
• 发表时间: 2007-07-01
• 期刊: GEOLOGY
• 影响因子: 5.8
• 作者: Ingle, Stephanie;Mahoney, John J.;Nakanishi, Masao
• 通讯作者: Nakanishi, Masao