Observational and experimental study on water contentin the Earth's mantle

地幔含水量的观测与实验研究

• 批准号: 22340124
• 负责人: TOH Hiroaki
• 金额: $ 7.24万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22340124/
• 关键词: 内部構造; 電気伝導度; マントル遷移層; 含水率; 海底電磁気観測; 高温高圧室内実験; 高温高圧実験

Water in the Earth’s mantle as a trace element significantly modifies physical properties of our mantle as well as its convection mode. In this study, we focused on the mantle transition zone, which has been revealed to have high potential for water storage, and aimed at delineating its water content by both seafloor electromagnetic (EM) observation and high-pressure/temperature experiments. The laboratory experiments showed that a small amount of water (<0.1 wt%) cannot have a significant impact on electrical conductivity of the mantle minerals in the transition zone, while the seafloor EM observation revealed a relatively dry (up to a few permil) transition zone beneath the Northwest Pacific Basin.

地幔中的水作为一种微量元素，极大地改变了我们地幔的物理性质及其对流模式。在这项研究中，我们将重点放在地幔过渡带，该带已被发现具有很高的储水潜力，目的是通过海底电磁观测和高压/温度实验来圈定其水分含量。实验室实验表明，少量水(&lt；0.1wt%)不会对过渡带中地幔矿物的电导率产生显著影响，而海底电磁观测显示，西北太平洋海盆下方存在一个相对干燥(最多几个珍珠层)的过渡带。

项目成果

Earthquake Research and Analysis

地震研究与分析

• 发表时间: 2012
• 作者: 松波雅治;宮崎秀俊;木村真一;他2名;Ohtsuki K.;H. Toh and T. Minami
• 通讯作者: H. Toh and T. Minami

Effect of solar daily variations on MT and GDS signals

太阳日变化对 MT 和 GDS 信号的影响

• 发表时间: 2011
• 作者: Toh;H
• 通讯作者: H

Electromagnetic View of the Seismogenic Zones Beneath Island Arcs

岛弧下方地震带的电磁视图

• 发表时间: 2012
• 期刊: Earthquake Research and Analysis
• 作者: Toh;H.;T.Minami
• 通讯作者: T.Minami

Transient response of the conducting Earth: Comparison of the observed and theoretical step response

导电地球的瞬态响应：观测到的阶跃响应与理论阶跃响应的比较

• 发表时间: 2012
• 作者: Toh;H
• 通讯作者: H

Long-term seafloor electromagnetic observation in the Northwest Pacific may detect the vector geomagnetic secular variation

西北太平洋长期海底电磁观测可探测矢量地磁长期变化

• 发表时间: 2010
• 期刊: Data Sci. J
• 作者: Toh;H.;et al.
• 通讯作者: et al.