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Material Science of interaction between descen ding palate and core, and the core-mantle boundary

下降腭与核之间以及核幔边界之间相互作用的材料科学

基本信息

批准号：
12126201
负责人：
OHTANI Eiji
金额：
$ 43.07万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12126201/
关键词：
Core-mantle boundary Diamond anvil cell Synchrotron radiation Lower Mantle FeSi (Mg, Fe) O FeH MORB 核マントル境界 (Mg,Fe)O レーザー加熱法マグネシオブスタイト Fosi合金状態方程式 SiO_2 稜面体構造

项目摘要

We developed the laser heated diamond anvil cell system and sintered diamond multianvil systen, which enable us to generate high temperature up to above 2000 K at around 100 GPa, and 3000K at pressures above 30 GPa. Following results are obtained by using these systems ; (1)We confirmed that (Mg, Fe) O with a NaCl structure up to 100 GPa and 2000K, (2)Compression curve of FeH has been clarified, and we found that FeH become incompressible at pressure above 50 GPa, which may be caused by the electromagnetic transformation. Incompressible nature of FeH at high pressure suggests that the H content explaining the density deficit of the core is 1/3 of that estimated previously, (3)We determined the compression curves of FeSi alloys up to 200 GPa. The low density and high incompressibility of FeSi alloys are consistent with the physical properties of the core, and this indicates that Si is also a plausible candidate for the light elements of the core, (4)We clarified the reaction of Iron and silicate up to 80 GPa and 3500K and found that some Si and O are dissolved into the metallic iron in this condition, (5)We clarified the kinetics of post-spinel and post-garnet transformations, and applied the results for subducting plates into the lower mantle, (6)We determined the maximum water content in wadsleyite and ringwoodite, magnesiowustite, and perovskite, and estimated the water storage capacity of the transition zone and lower mantle.

我们研制了激光加热金刚石对顶砧系统和烧结金刚石多对顶砧系统，使我们能够在100 GPa左右产生2000 K以上的高温，在30 GPa以上的压力下产生3000 K以上的高温。（2）得到了FeH的压缩曲线，发现在50 GPa以上FeH变成不可压缩的，这可能是由电磁相变引起的。FeH在高压下的不可压缩性质表明，解释核密度亏损的H含量是以前估计的1/3。（3）测定了FeSi合金在200 GPa以下的压缩曲线。FeSi合金的低密度和高不可压缩性与核的物理性质相一致，这表明Si也可能是核轻元素的候选者。（4）我们阐明了在80 GPa和3500 K下铁与硅酸盐的反应，发现在这种条件下，一些Si和O溶解到金属铁中，（5）阐明了后尖晶石和后石榴子石转变的动力学，并将其应用于板块向下地幔俯冲的研究。（6）测定了华氏体、菱锰矿、镁橄榄石和钙钛矿的最大含水量，估算了过渡带和下地幔的储水量。