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

机构：[1] Deep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; [2] Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China; [3] School of Earth and Space Sciences, Peking University, Beijing, China; [4] State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China; [5] Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, China; [6] College of Science, Guizhou Institute of Technology, Guiyang, China; [7] Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States

第一机构：Deep Space Exploration Laboratory/School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China

通信机构：Center for High Pressure Science, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China;College of Science, Guizhou Institute of Technology, Guiyang, 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：EI(收录号：20244717412383);Scopus(收录号：2-s2.0-85209694543)

语种：英文

外文关键词：Hydrogeology

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 ～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 ～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. ? 2024. The Author(s).