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.
现将本研究项目的重要科学成果总结如下。用高温量热法测定了Mg_2SiO_4-Fe_2SiO_4体系中橄榄石修饰尖晶石-尖晶石相变的焓。从目前的热化学数据计算出的相图与Ringwood和Major(1970)和Kawada(1977)的相图不太一致,但与Katsura和Ito(1989)用精确的高压实验得出的相图非常一致。由相图可知,橄榄石-尖晶石相变发生在地幔内390 ~ 410 km处,而尖晶石-尖晶石相变发生在地幔内490 ~ 540 km处。390公里和650公里处的温度估计分别为1400和1600ºC。用同样的量热法测定了Mg_4Si_4O_<12>-Mg_3Al_2 Si_3O_<12>体系中辉石-石榴石转变的焓。计算得到的相图与Akaogi和Akimoto(1977)在修正压力标度时的高压实验相图吻合较好。相图表明,地幔中辉石岩-石榴石的转变是随深度逐渐发生的,在300-500 km左右的深度范围内,没有明显的地震速度不连续。采用新型bridgman - an砧(直径26毫米)和烧结金刚石尖端,可产生超过18 GPa的高压。用这些新试样考察了β - zn_2sio_4向ZnSiO_3钛铁矿+ ZnO的转变。根据测定的ZnSiO_3中辉石-钛铁矿转变焓和Ni_2SiO_4尖晶石歧化焓,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:
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    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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