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.

我们开发了激光加热的钻石砧细胞系统和烧结的钻石多轴化学系统，这使我们能够在100 GPA约100 GPA时产生高达2000 K的高温，而在30 GPA以上的压力下，高温为3000K。通过使用这些系统获得以下结果；（1）我们确认（Mg，fe）O的NaCl结构高达100 GPA和2000K，（2）FEH的压缩曲线已被澄清，并且我们发现FEH在高于50 GPA的压力下变得不可压缩，这可能是由电磁转化引起的。高压下FEH的不可压缩性质表明，解释核心的密度不足的H含量为先前估计的1/3，（3）我们确定了FESI合金的压缩曲线最高为200 GPa。 FESI合金的低密度和高不可压缩性与核心的物理特性一致，这表明Si也是核心光元素的合理候选者，（4）我们清楚了铁的反应，并最大程度地溶解了一些SI和O的SI和O溶液（5），并在sif中溶解了一些（5），我们的盐分（5）是5），我们的估计性（5）我们的条件（5）我们的条件（5）我们的条件（5）我们的条件（5）我们的条件（5）我们溶解了si和o。在形成后转化，并将结果应用于俯冲板中，（6）我们确定了Wadsleyite和Ringwoodite，Magnesiowustite和Perovskite中的最大水分含量，并估计过渡区的储水容量和较低的地幔。