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.

我们已经阐明了地幔深处矿物的物理性质和水的影响。除了淬火实验之外，还通过原位 X 射线测量进行了实验。从我们之前的研究中，已经阐明橄榄石、瓦兹利石和尖角橄榄石的高压多晶型物的晶体结构中可以含有 2-3 wt% 的 H_2O，但H_2O在这些矿物中的分配尚未明确。本研究明确了H_2O的分配以合成这些共存相，并发现地幔过渡带应该是地球内部强大的水库。对水合尖晶石进行了研究，以澄清地幔中的H_2O含量。结合这些结果与地震观测，我们估算了地幔中的H_2O含量。与地震学家进行了进一步广泛的研究。我们还尝试通过原位X射线观察观察使用相对轻的金属胶囊封装的高压水相的脱水和物理性质。我们成功地利用AgPd胶囊获得了超水B相的X射线谱，并进一步改进了由单晶金刚石套筒和金属帽制成的胶囊，用于原位X射线实验。该胶囊相当成功，通过原位X射线实验实现了高压下X射线谱的有效采集。该技术已用于测定含水熔体结构和脱水的时间分辨实验。

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。

Precise determination of phase relations in pyrolite across the 660 km seismic discontinuity by in situ X-ray diffraction and quench experiments

• DOI: 10.1016/j.pepi.2003.08.010
• 发表时间: 2004-06-15
• 期刊: PHYSICS OF THE EARTH AND PLANETARY INTERIORS
• 影响因子: 2.3
• 作者: Nishiyama, N;Irifune, T;Funakoshi, K
• 通讯作者: Funakoshi, K

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

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。

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