首页|Electrical Conductivity of Multiphase Garnet under High-Temperature and High-Pressure Conditions

Electrical Conductivity of Multiphase Garnet under High-Temperature and High-Pressure Conditions

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Mineral mixing,a fundamental process during mantle convection,alters the chemical com-position of mantle minerals.However,the impact of this process on the electrical conductivity of mineral assemblages remains poorly understood.We measured the electrical conductivity of three single-phase garnets and their corresponding mixtures at 1.5 GPa and varying temperatures using the impedance spectroscopy within frequency from 10-1 to 106 Hz.The electrical conductivity of dehydrated garnets is primarily controlled by their iron content,exhibiting an activation energy about 1.0 eV,indicative of small polaron conduction.The garnet mixture displays lower electrical conductivities and higher activa-tion energies compared to their single-phase counterparts.This discrepancy of conductivity can be half order of magnitude at high temperatures(＞1 073 K),suggesting formation of resistive grain boundaries during the mixing process.In the mantle transition zones,grain boundary conductivity could exert a lim-ited impact on the bulk conductivity of the interface between the stagnant slab and ambient mantle.

almandineimpedance spectroscopyinterfaceconductivity anomaliesgarnetsminer-als

Kui Han、Xinzhuan Guo、Hanyong Liu、Fengbao Ji

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Key Laboratory of Earth Exploration and Information Techniques(Chengdu University of Technology),Ministry of Education,Chengdu 610059,China

Bayerisches Geoinstitute,University of Bayreuth,Bayreuth D95447,Germany

CAS Key Laboratory of High-Temperature and High-Pressure Study of the Earth'Interior Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China

Tibet Museum of Natural Science,Lhasa 850000,China

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2024

10.1007/s12583-024-0062-8

地球科学学刊(英文版)
中国地质大学

地球科学学刊(英文版)

CSTPCD
影响因子：0.724
ISSN：1674-487X
年,卷(期)：2024.35(6)