Electrical conductivity of shoshonitic melts with application to magma reservoir beneath the Wudalianchi volcanic field, northeast China,Physics of the Earth and Planetary Interiors

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Electrical conductivity of shoshonitic melts with application to magma reservoir beneath the Wudalianchi volcanic field, northeast China
Physics of the Earth and Planetary Interiors ( IF 2.4 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.pepi.2020.106545
Bin Li , Li Zhang , Xuan Guo , Wan-Cai Li , Huaiwei Ni

Abstract Electrical conductivity of alkali-rich silicate melts is less well known than for subalkaline melts. This work experimentally determined the electrical conductivity of shoshonitic (potassium-rich trachyandesitic) melts at 1073–1823 K and 0.5–1.8 GPa with H2O content up to 2.6 wt% in a piston cylinder apparatus. The activation volume (~8.5 cm3/mol) which characterizes pressure effect is at the lower end of previously reported values for silicate melts, but the H2O effect and temperature effect are among the strongest. Logarithmic electrical conductivity of shoshonitic melt is roughly linearly correlated with H2O content. The addition of 2 wt% H2O can increase electrical conductivity at 1373–1573 K by 0.7–0.9 log units. The strong H2O and temperature effects are associated with a greater role played by cations other than Na+ (especially K+, Ca2+, Mg2+) in electrical conduction in shoshonitic melt, in spite of that the direct contribution of hydroxyl (OH−) is minimal. A quantitative model built upon the obtained electrical conductivity data was used to interpret the MT results for the Wudalianchi volcanic field in northeast China. We infer the existence of 2–17 vol% shoshonitic melt with 2–4 wt% H2O in the crustal magma reservoirs beneath the Wudalianchi volcanic field.

更新日期：2020-09-01

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