Measurement of Electrical Conductivity within the crust and its anisotropy

地壳内电导率及其各向异性的测量

• 批准号: 16540387
• 负责人: FUJITA Kiyoshi
• 金额: $ 1.92万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540387/
• 关键词: Solid Earth; Geomagnetism; Earth and Planetary Interior; Crust and Mantle; Mineralogy; 地殻; 電気伝導度; 電磁気観測

Electrical conductivity measurements carried out at mid-to lower crustal temperature and pressure on various rocks and minerals showed a stable and reversible trend. To obtain such stabilized conductivity data, repeated heating and cooling before measurements were required, and the samples should be maintained for long duration at maximum temperature. In our study, we carefully considered measurement orientation for rock samples. Conductivity measurements perpendicular and parallel to mineral foliation in some rocks indicated an order difference in conductivity at the same temperature range. We also obtained unique values of activation energy for various samples. These values were examined and compared with those of other rock type groups obtained by former studies. To evaluate conduction mechanism, mineral compositions and petrofablic of recovered samples, we conducted EPMA analysis after electrical conductivity measurements. This analysis proves that there is no major change in the chemical or physical aspects of the samples before and after measurement. Consequently, experimental results can be compared with those of former EM soundings. Remarkably, conductivity of the mid-to lower crust inferred from field measurements corresponds to that of rock samples.

在中低地壳温度和压力下对各种岩石和矿物进行的电导率测量显示出稳定和可逆的趋势。为了获得这种稳定的电导率数据，需要在测量之前重复加热和冷却，并且样品应在最高温度下保持较长时间。在我们的研究中，我们仔细考虑了岩石样本的测量方向。垂直和平行于矿物叶理在某些岩石的电导率测量表明，在同一温度范围内的电导率的顺序差异。我们还获得了不同样品的活化能的唯一值。这些值进行了检查，并与以前的研究获得的其他岩石类型组。为了评价回收样品的导电机制、矿物组成和岩石组成，我们在电导率测量后进行了EPMA分析。该分析证明测量前后样品的化学或物理方面没有重大变化。因此，实验结果可以与以前的EM探测结果进行比较。值得注意的是，从现场测量推断的中地壳到下地壳的电导率与岩石样品的电导率相对应。

项目成果

Electrical conductivity measurement of metamorphic rocks under lower crustal conditions

下地壳条件下变质岩的电导率测量

• 发表时间: 2005
• 期刊: 10^<th> Scientific Assembly of the International Association of Geomagnetism and Aeronomy, Abatract GAI04
• 作者: T.Sakamoto;A.Sumi;S.Emori;T.Nishimura;H.Hasumi;et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta etal.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;藤田 清士;Fuji-ta et al.;Fuji-ta et al.;藤田 清士;藤田 清士;藤田 清士;Fuji-ta et al.
• 通讯作者: Fuji-ta et al.

Electrical conductivity variations of brucite and basic rock under crustal P-T conditions

地壳P-T条件下水镁石和基性岩的电导率变化

• 发表时间: 2006
• 期刊: 2006 AGU Fall Meeting MR43C-1097
• 作者: T.Sakamoto;A.Sumi;S.Emori;T.Nishimura;H.Hasumi;et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta etal.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;藤田 清士;Fuji-ta et al.;Fuji-ta et al.
• 通讯作者: Fuji-ta et al.

Electrical conductivity Measurement of granulite Under lower crustal P-T conditions

下地壳 P-T 条件下麻粒岩的电导率测量

• 发表时间: 2004
• 期刊: Geophysical Journal International 157
• 作者: T.Sakamoto;A.Sumi;S.Emori;T.Nishimura;H.Hasumi;et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta etal.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.;藤田 清士;Fuji-ta et al.;Fuji-ta et al.;藤田 清士;藤田 清士;藤田 清士;Fuji-ta et al.;藤田 清士 他;Fuji-ta et al.
• 通讯作者: Fuji-ta et al.

Electrical conductivity measurement of metamorphic gneiss under lower crustal P-T conditions

下地壳P-T条件下变质片麻岩电导率测量

• 发表时间: 2007
• 期刊: Tectonophysics 434
• 作者: T.Sakamoto;A.Sumi;S.Emori;T.Nishimura;H.Hasumi;et al.;Fuji-ta et al.
• 通讯作者: Fuji-ta et al.

Electrical conductivity measurement of metamorphic gneiss under lower crustal P-T conditions.

下地壳P-T条件下变质片麻岩的电导率测量。

• 发表时间: 2007
• 期刊: Tectonophysics 434
• 作者: T.Sakamoto;A.Sumi;S.Emori;T.Nishimura;H.Hasumi;et al.;Fuji-ta et al.;Fuji-ta et al.;Fuji-ta et al.
• 通讯作者: Fuji-ta et al.