Physical properties of deep Earth minerals and the effect of water

地球深层矿物的物理性质和水的影响

• 批准号: 15340150
• 负责人: INOUE Toru
• 金额: $ 10.5万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340150/
• 关键词: mantle mineral; elastic wave velocity; ultrasonic measurement; water partitioning; hydrous magma; high pressure hydrous phase; high pressure apparatus; water in the mantle; 焼結体; 相転移; 超音波音速測定

We have clarified the physical properties of deep Earth mantle minerals and the effect of water. Experiments were conducted by in situ X-ray measurements in addition to quench experiments.From our previous studies, it has been clarified that high pressure polymorphs of olivine, wadsleyite and ringwoodite, can contain 2-3 wt% of H_2O in their crystal structures, but the partitioning of H_2O among these minerals has not been clarified yet. In the present study, we have clarified the partitioning of H_2O to synthesize these coexisting phases, and found that mantle transition zone should be a strong water reservoir in the Earth's interior.In addition, the measurements of thermal expansion and elastic properties of hydrous wadsleyite and hydrous ringwoodite were conducted to clarify the H_2O content in the mantle. Combined these results with seismic observation, we estimated the H_2O content in the mantle. Further extensive studies have been conducted with seismologist.We also tried to observe dehydration and physical properties of high pressure hydrous phase with capsulation using relatively light metal capsule by in situ X-ray observation. We succeeded to get X-ray spectra of superhydrous phase B using AgPd capsule, and further improved capsule, which were made by a single crystal diamond sleeve and metal caps, were designed for in situ X-ray experiment. The capsule is quite successful, and the effective acquisition of X-ray spectra under high pressure has been achieved by in situ X-ray experiment. This technique has been adopted to determine hydrous melt structure and time-resolved experiment of dehydration.

阐明了地球深部地幔矿物的物理性质和水的作用。在前人的研究中，我们已经明确了高压多晶型的橄榄石、水硅铝石和水硅铝石的晶体结构中可以含有2- 3wt%的H_2O，但H_2O在这些矿物中的分配还没有明确。本文阐明了H_2O在地幔过渡带中的分配作用，发现地幔过渡带是地球内部的一个强水储集区，并通过对水化的wadsleyite和水化的ringwoodite的热膨胀和弹性性质的测量，阐明了地幔中H_2O的含量。结合地震观测结果，估算了地幔中H_2O的含量。我们还尝试了用较轻的金属包壳进行包壳的高压含水相的脱水和物理性质的现场X射线观测。我们成功地使用AgPd胶囊获得了超水相B的X射线谱，并进一步改进了胶囊，由单晶金刚石套筒和金属帽制成，用于原位X射线实验。该装置是成功的，并通过原位X射线实验实现了高压下X射线能谱的有效获取。该技术已用于测定含水熔体结构和脱水时间分辨实验。

项目成果

T.Irifune, A.Kurio, S.Sakamoto, T.Inoue, H.Sumiya, K.Funakoshi: "Formation of pure polycrystalline diamond by direct conversion of graphite at high pressure and high temperature"Physics of Earth and Planetary Interiors. in press.

T.Irifune、A.Kurio、S.Sakamoto、T.Inoue、H.Sumiya、K.Funakoshi：“通过在高压和高温下直接转化石墨来形成纯多晶金刚石”地球和行星内部物理学。

High-pressure and high-temperature stability and equation of state of superhydrous phase B

超水B相的高压高温稳定性及状态方程

• 发表时间: 2006
• 期刊: Geophysical Monograph Series 168
• 作者: T.Inoue;T.Ueda;Y.Higo;A.Yamada;T.Irifune;R.C.Liebermann
• 通讯作者: R.C.Liebermann

Grain growth of ringwoodite and its implication for rheology of the subducting slab

尖角橄榄石的晶粒生长及其对俯冲板片流变学的意义

• 发表时间: 2005
• 期刊: Earth Planet.Sci.Lett. 236
• 作者: Yamada;K.;Inagaki;N.;D.Tamazaki
• 通讯作者: D.Tamazaki

The phase boundary between CaSiO3 perovskite and Ca2SiO4 + CaSi2O5 determined by in situ X‐ray observations

• DOI: 10.1029/2006gl025772
• 发表时间: 2006-05
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Yuichiro Sueda;T. Irifune;A. Yamada;T. Inoue;Xi Liu;K. Funakoshi

T.Irifune, A.Kurio, S.Sakamoto, T.Inoue, H.Sumiya: "Ultrahard polycrystalline diamond from graphite"Nature. 421. 599-600 (2003)

T.Irifune、A.Kurio、S.Sakamoto、T.Inoue、H.Sumiya：“来自石墨的超硬多晶金刚石”自然。