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- Title
Electrical Conductivity of CO<sub>2</sub> and H<sub>2</sub>O‐Bearing Nephelinitic Melt.
- Authors
Guo, Xuan; Wang, Qinxia; Li, Bin; Zha, Xiang‐Ping; Gong, Bing; Ni, Huaiwei
- Abstract
Despite previous measurements on electrical conductivity of carbonate or carbonatite melts, the effect of several wt% CO2 on electrical conductivity of silicate melts has never been experimentally examined. This study investigated the CO2 effect on electrical conductivity of nephelinitic melt at 500°C–1,150°C and 0.5–1.0 GPa with 0.1–6.0 wt% CO2 and 0.2–1.6 wt% H2O in piston cylinder apparatus using sweeping frequency impedance analyses. Experimental results show that volatile‐bearing nephelinitic melt is highly conductive. In contrast with the strong enhancing effect of H2O on electrical conductivity of silicate melts, CO2 shows weak and even slightly negative influence on electrical conductivity of nephelinitic melt within the investigated CO2 range. Literature data of electrical conductivity of hydrous carbonated basaltic melts suggested strong positive CO2 effect at CO2 >10 wt%, but their model prediction at <6 wt% CO2 is consistent with our results. A weak CO2 effect implies that CO32− does not contribute to electrical conduction in any significant way at CO2 <6 wt%. Our results suggest that magnetotelluric survey is much less sensitive to CO2 content than to H2O content of crustal magma reservoirs. Key Points: CO2 and H2O‐bearing nephelinitic melt is very conductiveCO2 effect on melt conductivity is weak when CO2 <6 wt%It is difficult to constrain CO2 content of crustal nephelinitic melt from magnetotellurics
- Subjects
ELECTRIC conductivity; CARBON dioxide; OXYGEN; NEPHELINITE; CARBONATES
- Publication
Journal of Geophysical Research. Solid Earth, 2021, Vol 126, Issue 4, p1
- ISSN
2169-9313
- Publication type
Article
- DOI
10.1029/2020JB019569