Accurate determination of phase equilibrium diagrams by calorimetric measurements of high pressure silicate minerals and applications to structure of the earth's mantle.

通过高压硅酸盐矿物的量热测量准确确定相平衡图及其在地幔结构中的应用。

基本信息

  • 批准号:
    62540618
  • 负责人:
  • 金额:
    $ 1.54万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1987
  • 资助国家:
    日本
  • 起止时间:
    1987 至 1989
  • 项目状态:
    已结题

项目摘要

The important scientific results of this research project are summarized as follows.1. Enthalpies of the olivine-modified spinel-spinel transitions in the system Mg_2SiO_4-Fe_2SiO_4 were measured by high temperature calorimetric techniques. The phase diagrams calculated form the present thermochemical data are not well consistent with those by Ringwood and Major (1970) and Kawada (1977), but agree very well with that determined with precise high pressure experiments by Katsura and Ito (1989). From the calculated phase diagrams, it is concluded that the olivine-modified spinel transition occurs at about 390-410 km in the mantle, while the modified spinel-spinel transition at about 490-540 km. Temperatures at 390 and 650 km are estimated to be 1400 and 1600 ゚C, respectively.2. Enthalpy of the pyroxene-garnet transition in the system Mg_4Si_4O_<12>-Mg_3Al_2 Si_3O_<12> was measured by the same calorimetric techniques. The calculated phase diagram was in good agreement, with that by high pressure experiments by Akaogi and Akimoto (1977), when the pressure scale was revised. It was concluded from the phase diagram that the pyroxene-garnet transition in the mantle occurs gradually with depth in the depth range of about 300-500 km and shows no sharp seismic velocity discontinuity.3. High pressures over 18 GPa were generated by using new Bridgman-anvils (26 mm in diameter) with sintered diamond tips. The transition of beta-Zn_2SiO_4 to ZnSiO_3 ilmenite plus ZnO was examined using these new anvils.4. From the measured enthalpies of the pyroxene-ilmenite transition in ZnSiO_3 and of the disproportionation of Ni_2SiO_4 spinel, these phase equilibrium boundaries were calculated thermodynamically.
本研究项目的重要科学成果概括如下:1.用高温量热法测定了Mg_2SiO_4-Fe_2SiO_4系统中橄榄石改性尖晶石-尖晶石转变焓。由本热化学数据计算的相图与Ringwood和Major(1970)及Kawada(1977)的相图不太一致,但与Katalina和Ito(1989)用精密高压实验测定的相图非常一致。从计算的相图可以看出,橄榄石-尖晶石相变发生在地幔中390-410 km处,而尖晶石-尖晶石相变发生在地幔中490-540 km处。390和650公里处的温度估计分别为1400和1600摄氏度。用同样的量热法测定了Mg_4Si_4O_3-Mg_3Al_2Si_3O_3体系中辉石-石榴石转变的焓<12><12>。在修正压力标度后,计算的相图与Akaogi和Akimoto(1977)的高压实验结果符合得很好。相图表明,在300-500 km深度范围内,地幔中的辉石-石榴子石转变是逐渐发生的,且没有明显的地震速度不连续性.通过使用具有烧结金刚石尖端的新型Bridgman砧(直径26 mm)产生超过18 GPa的高压。利用这些新顶砧研究了β-Zn_2SiO_4向ZnSiO_3钛铁矿加ZnO的转变.根据ZnSiO_3中辉石-钛铁矿转变和Ni_2SiO_4尖晶石分解的实验数据,计算了这些相平衡边界。

项目成果

期刊论文数量(17)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
McMillan, P., Akaogi, M., Ohtani, E., Williams, Q., Nieman, R. and Sato, R.: "Cation disorder in garnets along the Mg_3Al_2Si_3O_<12>-Mg_4Si_4O_<12> join: an infrared, Raman and NMR study." Phys. Chem. Minerals, 16, 428-435, 1989.
McMillan, P.、Akaogi, M.、Ohtani, E.、Williams, Q.、Nieman, R. 和 Sato, R.:“石榴石中沿着 Mg_3Al_2Si_3O_<12>-Mg_4Si_4O_<12> 连接的阳离子无序:红外
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
Akaogi, M.: "Thermodynamics and stability relations of mantle minerals." Dynamic Processes of Material Transport and Transformation in the Earth's Interior, Terra Sci. Publ., 1990.
Akaogi, M.:“地幔矿物的热力学和稳定性关系。”
  • DOI:
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    0
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  • 通讯作者:
Matsui,M.: "Computational model of the structural and elastic properties of the ilmenite and perovskite phases of MgSiO_3." Phys.Chem.Minerals. 14. 101-106 (1987)
Matsui,M.:“MgSiO_3 钛铁矿和钙钛矿相的结构和弹性性能的计算模型。”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Akaogi,M.: "The olivine-modified spinel-spinel transitions in the system Mg_2SiO_4-Fe_2SiO_4:calorimetric measurements,ther-mochemical calculation and geophysical application." J.Geophys.Res.94. 15671-15685 (1989)
Akaogi,M.:“Mg_2SiO_4-Fe_2SiO_4体系中橄榄石改性的尖晶石-尖晶石转变:量热测量、热化学计算和地球物理应用。”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Akaogi,M.: "Thermodynamics and stability relations of mantle minerals" Dynamic Processes of Material Transport and Transformation in the Earth's Interior(Terra Sci.Pulbl.Co.). (1990)
Akaogi,M.:“地幔矿物的热力学和稳定性关系”地球内部物质传输和转化的动态过程(Terra Sci.Pulbl.Co.)。
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AKAOGI Masaki其他文献

AKAOGI Masaki的其他文献

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{{ truncateString('AKAOGI Masaki', 18)}}的其他基金

High-pressure phase equilibria and thermodynamics of mantle minerals: postspinel and postperovskite
地幔矿物的高压相平衡和热力学:后尖晶石和后钙钛矿
  • 批准号:
    22340163
  • 财政年份:
    2010
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
High-pressure phase equilibria and thermodynamic properties of silicate minerals and related materials in the lower mantle conditions
下地幔条件下硅酸盐矿物及相关材料的高压相平衡和热力学性质
  • 批准号:
    19340166
  • 财政年份:
    2007
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
High pressure phase equilibria of constituent minerals of mantle and oceanic crust, and chemical heterogeneity of deep mantle
地幔和洋壳组成矿物的高压相平衡及深部地幔化学非均质性
  • 批准号:
    15204049
  • 财政年份:
    2003
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Phase Transformations and Thermodynamic Properties of Constituent Minerals of Slabs in the Lower Mantle
下地幔板片组成矿物的相变和热力学性质
  • 批准号:
    11440162
  • 财政年份:
    1999
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Phase Transitions and Melting of Minerals at Ultrahigh Pressures and Chemical Evolution of the Mantle
超高压下矿物的相变和熔化以及地幔的化学演化
  • 批准号:
    08404034
  • 财政年份:
    1996
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Study on deep structure and dynamics of the mantle by calorimetric measurements of high pressure silicates
高压硅酸盐量热测量研究地幔深层结构和动力学
  • 批准号:
    03453058
  • 财政年份:
    1991
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Development of anvil with sintered diamond core for high pressure high temperature experiments
高压高温实验用烧结金刚石芯砧座的研制
  • 批准号:
    01840029
  • 财政年份:
    1989
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research
Accurate and rapid measurements of thermodynamic properties of minerals by microcalorimetric method.
采用微量热法准确快速测量矿物的热力学性质。
  • 批准号:
    60840023
  • 财政年份:
    1985
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research

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