The electrical conductivity of upper-mantle rocks: water content in the upper mantle |
| |
Authors: | Duojun Wang Heping Li Li Yi Baoping Shi |
| |
Affiliation: | (1) Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Lab of Computational Geodynamics, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China;(3) Institute of Earthquake Science, China Earthquake Administration, Beijing, 100036, China |
| |
Abstract: | The electrical conductivity of upper-mantle rocks—dunite, pyroxenite, and lherzolite—was measured at ∼2–3 GPa and ∼1,273–1,573 K using impedance spectra within a frequency range of 0.1–106 Hz. The oxygen fugacity was controlled by a Mo–MoO2 solid buffer. The results indicate that the electrical conductivity of lherzolite and pyroxenite are approximately half and one order of magnitude higher than that of dunite, respectively. A preliminary model involving water and iron content effects on the electrical conductivity was derived and is summarized by the relation: The results also indicate that pyroxenes dominate the bulk conductivity of upper mantle in hydrous conditions and suggest the maximum water content in oceanic upper mantle is as high as ∼0.09 wt%. |
| |
Keywords: | Electrical conductivity Upper mantle Water content |
本文献已被 SpringerLink 等数据库收录! |
|