权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Studies on material properties of the subducted slab and lower mantle

俯冲板片和下地幔物质特性研究

基本信息

批准号：
12126203
负责人：
KATURA Tomoo
金额：
$ 37.7万
依托单位：
Okayama 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

项目摘要

We have designed and installed the large-volume high P-T apparatus for in situ X-ray observation, SPEED-Mk.II in the white-X-ray beam line BL04B1 at the third generation synchrotron radiation facility, SPring-8. By using sintered diamond anvils, we have extended the pressure range generated by multi-anvil apparatus from 40 to 63 GPa. SPEED-Mk.II is equipped with the oscillation system, which enables us to obtain high-quality diffraction pattern against grain growth. We have demonstrated the usefulness of this system by determining the phase boundary of B1-B2 transition in NaCl.We have also obtained the following results in earth sciences. 1)We have shown presence of oxygen defect in Mg-perovskite due to the substitution of Al_2O_3 by means of NMR spectroscopy. 2)We have determined pressure dependence of shear and bulk moduli of MgSiO_3 perovskite, Mg_2SiO_4 ringwoodite and Mg_2SiO_4 wadsleyite by resonance technique. 3)We have determined the melting relation in peridotite at pressures up to 33 GPa. 4)We have studied the phase relation of iron, showing absence of beba-phase that is recently reported by several studies. 5)We have determined the equation of state of CaSiO_3 perovskite up to 40 GPa. 6)We have determined the stability relations of MgAl_2O_4 calcium ferrite. 7)We have studied the phase relations in NaAlSiO_4, determining the stability field of the calcium ferrite phase. 8)We have measured electrical conductivities of (Mg, Fe)_2SiO_4 perovskite and ilmenite up to 40 GPa.

我们在第三代同步辐射装置SPring-8的白X射线束线BL 04 B1上设计并安装了大体积高P-T原位X射线观测装置SPEED-Mk.II。通过使用烧结金刚石顶锤，我们已经将多顶锤装置产生的压力范围从40 GPa扩展到63 GPa。SPEED-Mk.II配备了振动系统，这使我们能够获得高质量的衍射图案，防止晶粒生长。我们通过测定NaCl中B_1-B_2相变的相界证明了该系统的有效性，并在地球科学中得到了下列结果。（1）用核磁共振谱研究了镁钙钛矿中由于Al_2O_3的取代而产生的氧缺陷。（2）用共振技术测定了MgSiO_3钙钛矿、Mg_2SiO_4林伍德石和Mg_2SiO_4瓦氏石的剪切模量和体积模量随压力的变化关系。（3）确定了橄榄岩在33 GPa压力下的熔融关系。4）研究了铁的相关系，发现铁中不存在最近几项研究报道的beba相。5）在40 GPa压力下，我们确定了CaSiO_3钙钛矿的状态方程。6）确定了MgAl_2O_4铁酸钙的稳定关系。7）研究了NaAlSiO_4的相关系，确定了铁酸钙相的稳定范围。（8）在40 GPa的压力下测量了（Mg，Fe）_2SiO_4钙钛矿和钛铁矿的电导率。