Electrical Conductivity of Talc Dehydration at High Pressures and Temperatures: Implications for High‐Conductivity Anomalies in Subduction Zones

2020 ◽  
Vol 125 (10) ◽  
Author(s):  
Libing Wang ◽  
Duojun Wang ◽  
Kewei Shen
Keyword(s):  
Electrical Conductivity ◽  
Subduction Zones ◽  
High Pressures ◽  
High Conductivity ◽  
Conductivity Anomalies ◽  
High Pressures And Temperatures

scholarly journals Insights on the deep carbon cycle from the electrical conductivity of carbon-bearing aqueous fluids

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Geeth Manthilake ◽  
Mainak Mookherjee ◽  
Nobuyoshi Miyajima
Keyword(s):  
Electrical Conductivity ◽  
Subduction Zones ◽  
High Pressures ◽  
High Electrical Conductivity ◽  
Conductivity Measurements ◽  
Forming Mechanism ◽  
Geophysical Processes ◽  
High Pressures And Temperatures ◽  
Subducting Slab

AbstractThe dehydration and decarbonation in the subducting slab are intricately related and the knowledge of the physical properties of the resulting C–H–O fluid is crucial to interpret the petrological, geochemical, and geophysical processes associated with subduction zones. In this study, we investigate the C–H–O fluid released during the progressive devolatilization of carbonate-bearing serpentine-polymorph chrysotile, with in situ electrical conductivity measurements at high pressures and temperatures. The C–H–O fluid produced by carbonated chrysotile exhibits high electrical conductivity compared to carbon-free aqueous fluids and can be an excellent indicator of the migration of carbon in subduction zones. The crystallization of diamond and graphite indicates that the oxidized C–H–O fluids are responsible for the recycling of carbon in the wedge mantle. The carbonate and chrysotile bearing assemblages stabilize dolomite during the devolatilization process. This unique dolomite forming mechanism in chrysotile in subduction slabs may facilitate the transport of carbon into the deep mantle.

scholarly journals Effect of Temperature, Pressure, and Chemical Composition on the Electrical Conductivity of Schist: Implications for Electrical Structures under the Tibetan Plateau

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 961 ◽  
Author(s):  
Wenqing Sun ◽  
Lidong Dai ◽  
Heping Li ◽  
Haiying Hu ◽  
Changcai Liu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
High Pressures ◽  
High Conductivity ◽  
Effect Of Temperature ◽  
The Tibetan Plateau ◽  
Temperature Range ◽  
Electrical Conductivities ◽  
Conductivity Anomalies ◽  
Lower Temperature Range ◽  
Lower Temperature

The experimental study on the electrical conductivities of schists with various contents of alkali ions (CA = K2O + Na2O = 3.94, 5.17, and 5.78 wt.%) were performed at high temperatures (623–1073 K) and high pressures (0.5–2.5 GPa). Experimental results indicated that the conductivities of schist markedly increased with the rise of temperature. Pressure influence on the conductivities of schist was extremely weak at the entire range of experimental temperatures. Alkali ion content has a significant influence on the conductivities of the schist samples in a lower temperature range (623–773 K), and the influence gradually decreases with increasing temperature in a higher temperature range (823–1073 K). In addition, the activation enthalpies for the conductivities of three schist samples were fitted as being 44.16–61.44 kJ/mol. Based on the activation enthalpies and previous studies, impurity alkaline ions (K+ and Na+) were proposed as the charge carriers of schist. Furthermore, electrical conductivities of schist (10−3.5–10−1.5 S/m) were lower than those of high-conductivity layers under the Tibetan Plateau (10−1–100 S/m). It was implied that the presence of schist cannot cause the high-conductivity anomalies in the middle to lower crust beneath the Tibetan Plateau.

Electrical conductivity and amorphization of Sc2(WO4)3 at high pressures and temperatures

2002 ◽  
Vol 63 (3) ◽  
pp. 425-431 ◽  
Author(s):  
R.A. Secco ◽  
H. Liu ◽  
N. Imanaka ◽  
G. Adachi ◽  
M.D. Rutter
Keyword(s):  
Electrical Conductivity ◽  
High Pressures ◽  
High Pressures And Temperatures
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