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Thermal conductivity of earth materials under high temperature and high pressure

高温高压下土体材料的导热系数

基本信息

批准号：
04640405
负责人：
OSAKO Masahiro
金额：
$ 1.15万
依托单位：
National Science Museum
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04640405/
关键词：
MANTLE MATERIALS THERMAL CONDUCTIVITY HIGH-PRESSURE DEEP INTERIOR OF THE EARTH 高圧

项目摘要

To investigate the thermal state of the earth's mantle, the author intends to measure thermal conductivies of mantle candidate minerals under high pressures and high temperatures.A transient method of one dimension heat flow is applied to the thermal conductivity measurement under high pressure. A thin metallic plane heater is inserted between disks of sample. Cuts are made on the heater in order to enhance electric resistance for a sufficient power generated and to ensure uniform heating on the sample. A pulse current is supplied to the heater and temperature profile is detected on the far side of the sample by a thermocouple. Thermal conductivity is calculated from the decay of temperature, the electric power and the positions of the heater and the thermocouple. Measurements are made in a tetrahedral-anvil high-pressure appratus. Conditions of the measurements at the first step are : pressure of 10 GPa and temperature of 1500ﾟC.The materials or minerals to be investigated are alpha-, beta- and gamma- (Mg, Fe) _2SiO_4, (olivine, modified spinel and spinel), (Mg, Fe) SiO_3 (ortho and clino pyroxene), (Mg, Fe) _3Al_2Si_3O_<12>- (Mg, Fe) _4Si_4O_<12> solid solution and (Mg, Fe) SiO_3 perovskite. Other minor components of the mantle materials, such as stishovite are to be also investigated if necessary. Sintered samples of these materials should be prepared for the thermal conductivity measurement. Hot pressing is taken place in a NaCl capsule in order to obtain pore-free no-cracking samples.The experiments are continuing at present. Measurements on fused quartz show that this method can be used for the thermal conductivity of the small samples. Results of the thermal conductivity/diffusivity measurement for mantle materials under pressure will be made in the near future.

为了研究地幔的热状态，本文采用一维瞬态热流法测量了地幔候选矿物在高温高压下的热导率。薄金属平面加热器插入样品盘之间。在加热器上进行切割，以提高电阻，从而产生足够的功率，并确保对样品的均匀加热。向加热器提供脉冲电流，并通过热电偶在样品的远侧检测温度曲线。导热系数是根据温度的衰减、电功率以及加热器和热电偶的位置来计算的。测量是在四面体砧高压装置中进行的。第一步的测量条件为：压力10 GPa，温度1500 ℃。所研究的材料或矿物为α-，β-和γ-（Mg，Fe）_2SiO_4，（橄榄石，改性尖晶石和尖晶石），（Mg，Fe）SiO_3（正辉石和斜辉石），（Mg，Fe）_3Al_2Si_3O_<12>-（Mg，Fe）_4Si_4O_-<12>固溶体和（Mg，Fe）SiO_3钙钛矿。必要时还将调查地幔物质的其他次要成分，如斯季绍维特。应准备这些材料的烧结样品用于热导率测量。为了获得无气孔、无裂纹的试样，在氯化钠胶囊中进行了热压，目前实验还在进行中。对熔融石英的测量表明，该方法可用于小样品的热导率测量。在不久的将来，将得出压力下地幔材料导热率/扩散率的测量结果。