文献类型：期刊文献

英文题名：Electrical Conductivity of (Mg, Fe)CO₃ at the Spin Crossover and Its Implication for Mid-Mantle Geomagnetic Heterogeneities

作者：Zhao, Chaoshuai Liu, Jin Xu, Liangxu Hou, Mingqiang Zhuang, Yukai Zhu, Jie Lin, Jung-Fu

第一作者：Zhao, Chaoshuai

通信作者：Liu, J[1];Zhu, J[2]|[144400cfb20f3baa21213]朱洁;

机构：[1]Univ Sci & Technol China, Sch Earth & Space Sci, Deep Space Explorat Lab, Hefei, Peoples R China;[2]Yanshan Univ, Ctr High Pressure Sci, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao, Peoples R China;[3]Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China;[4]Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Geodesy & Earths Dynam, Wuhan, Peoples R China;[5]Sichuan Univ, Inst Atom & Mol Phys, Chengdu, Peoples R China;[6]Guizhou Inst Technol, Coll Sci, Guiyang, Peoples R China;[7]Univ Texas Austin, Jackson Sch Geosci, Austin, TX USA

第一机构：Univ Sci & Technol China, Sch Earth & Space Sci, Deep Space Explorat Lab, Hefei, Peoples R China

通信机构：corresponding author), Yanshan Univ, Ctr High Pressure Sci, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao, Peoples R China;corresponding author), Guizhou Inst Technol, Coll Sci, Guiyang, Peoples R China.|贵州理工学院理学院;贵州理工学院;

年份：2024

卷号：51

期号：22

外文期刊名：GEOPHYSICAL RESEARCH LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001369534900001)】；

基金：We thank Zhu Mao, Xueyan Du, and Wenge Yang for constructive discussion and technical assistance. This work is supported by the National Key Research and Development Program of China (2023YFF0804100, 2019YFA0708502). C. Zhao acknowledges support from the National Natural Science Foundation of China (42104101). J. Liu acknowledges support from the National Natural Science Foundation of China (42072052) and the Natural Science Foundation of Hebei (D2024203001, 2023HBQZYCSB008). M. Hou acknowledges support from the Natural Science Foundation of China (42394114, 42394112). Some experiments are supported by the Synergic Extreme Condition User Facility (SECUF) and BL15U1 at the Shanghai Synchrotron Radiation Facility (SSRF proposal#2022-SSRF-PT-021393).

语种：英文

外文关键词：electrical conductivity; (Mg, Fe)CO3; spin crossover; high pressure; high temperature; geomagnetic anomaly

摘要：(Mg, Fe)CO3 is an important deep carbon carrier and plays a vital role in our understanding of lower-mantle carbon reservoirs. The electrical conductivity (EC) of FeCO3 was measured at 126-2000 K up to 83 GPa in diamond-anvil cells using a standard four-probe van der Pauw method. Moreover, the EC of FeCO3 increases by similar to 6 orders of magnitude from 300 to 1500 K at 10-20 GPa, indicating a strong effect of high temperature. The EC of Fe0.65Mg0.35CO3 was measured up to 60 GPa at 300 K, the EC values of (Mg, Fe)CO3 are proportional to iron content and increase by 2-3 orders of magnitude at 300 K across the spin crossover. The EC values of (Mg, Fe)CO3 and FeCO3 + Fe3O4 +/- C mixtures surpass that of bridgmanite, ferropericlase and davemaoite by similar to 1-4 orders of magnitude at depths of 800-2,000 km. This result sheds insights into the genesis of local geomagnetic heterogeneities in the mid-lower mantle.