Institutional Repository of Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences
| Experimental study on electrical conductivity of pyrolite at high temperature and high pressure | |
| Gao ChunYang1,2; Huang XiaoGe1; Dai WeiQi1,2; Chen ZuAn1 | |
| 2020-09-01 | |
| Source Publication | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| ISSN | 0001-5733 |
| Volume | 63Issue:9Pages:3409-3419 |
| Abstract | The purpose of this work was to construct a generally electrical structure of the upper mantle. The electrical conductivity of dry pyrolite was measured on Kawai-1000t multi-anvil apparatus and Solartron-1260 impedance/Gain-Phase analyzer in the conditions of 4. 0 similar to 14. 0 GPa, 873 similar to 1673 K and 10(-1)similar to 10(6) Hz frequency ranges. The experimental results show that the electrical conductivity significantly increases with temperature. The conductive mechanism of pyrolite changes over a wide temperature range. When temperature is less than 1473 K, the small polaron model is the dominant conduction mechanism, activation energy Delta H and activation volume are 0. 94 eV +/- 0. 13 eV and 0. 11(+/- 0. 92) cm(3) . mol(-1), respectively. When temperature is more than 1473 K, the ionic conduction is the dominant conduction mechanism, activation energy Delta H and activation volume are 1.6 similar to 3.17 eV and 6.75 (+/- 7.43) cm(3) . mol(-1), respectively. The electrical conductivity of pyrolite is higher than that of mantle minerals and the rock under low pressure. In shallow mantle above 200 km depth, the electrical conductivity profile obtained by the experiments is consistent with the result of magnetotelluric sounding. However, in deep mantle under 200 km depth, the experimental result is a little higher than that of field measurement, perhaps because of the presence of water in the samples. In addition, the results of this experiment are two orders of magnitude higher than the electrical conductivity calculated by the effective uniform medium method according to the pyrolite mineral model, which indicates that the results calculated using the electrical conductivity of only one or several minerals are not reasonable to some extent. |
| Keyword | Electrical conductivity Pyrolite High temperature and high pressure Pressure |
| DOI | 10.6038/cjg2020O0100 |
| WOS Keyword | ORTHO-PYROXENE ; WATER-CONTENT ; OLIVINE ; BENEATH ; PHASE ; MODEL ; ASTHENOSPHERE ; SOLUBILITY ; MINERALS ; GARNET |
| Language | 英语 |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000566758300015 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/98244 |
| Collection | 地球与行星物理院重点实验室 |
| Corresponding Author | Huang XiaoGe |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| First Author Affilication | Institute of Geology and Geophysics, Chinese Academy of Sciences |
| Corresponding Author Affilication | Institute of Geology and Geophysics, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Gao ChunYang,Huang XiaoGe,Dai WeiQi,et al. Experimental study on electrical conductivity of pyrolite at high temperature and high pressure[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(9):3409-3419. |
| APA | Gao ChunYang,Huang XiaoGe,Dai WeiQi,&Chen ZuAn.(2020).Experimental study on electrical conductivity of pyrolite at high temperature and high pressure.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(9),3409-3419. |
| MLA | Gao ChunYang,et al."Experimental study on electrical conductivity of pyrolite at high temperature and high pressure".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.9(2020):3409-3419. |
| Files in This Item: | There are no files associated with this item. | |||||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment