Temperature analysis of the upper mantle in the North China Craton based on a three-dimensional magnetotelluric conductivity model

PreviousNext No AccessInternational Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019Temperature analysis of the upper mantle in the North China Craton based on a three-dimensional magnetotelluric conductivity modelAuthors: Baochun LiGaofeng Ye*Letian ZhangWenbo WeiSheng JinBaochun LiSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSearch for more papers by this author, Gaofeng Ye*School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaSearch for more papers by this author, Letian ZhangSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaSearch for more papers by this author, Wenbo WeiSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaSearch for more papers by this author, and Sheng JinSchool of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, ChinaState Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, ChinaSearch for more papers by this authorhttps://doi.org/10.1190/GEM2019-008.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract The factors affecting the conductivity of the mantle are: conduction mechanism (proton conduction, small polaron conduction, ion conduction), rock minerals composition and geometry, temperature, pressure, water content, etc. The conductivity-temperature relationship of silicates follows the Arrhenius equation, which is valid for nominally anhydrous minerals (NAMs) such as olivine, orthopyroxene, clinopyroxene and garnet. To characterize the temperature profile of the upper mantle in the North China Craton, magnetotelluric sounding data was obtained from the Magnetotelluric Array Observation Network, which has been deployed by the Deep Exploration Technology and Experimental Research Special Project (“SINOPROBE”). The three-dimensional resistivity model was determined using the ModEM inversion package, with Hashin-Shtrikman boundary conditions as constraints on the range of conductivities. The three-dimensional resistivity model, mineral components and water content were then used to determine the temperature structure and the percentage of the melt in the upper mantle. Our results show that the temperature range within the North China Craton is 8501550 °C, and the percentage of melt in the high temperature zone is between 1-10%. Keywords: magnetotelluric, conductivity electromagneticPermalink: https://doi.org/10.1190/GEM2019-008.1FiguresReferencesRelatedDetails International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Xi'an, China, 19–22 May 2019ISSN (online):2159-6832Copyright: 2019 Pages: 471 publication data© 2019 Published in electronic format with permission by the Society of Exploration Geophysicists and the Chinese Geophysical SocietyPublisher:Society of Exploration Geophysicists HistoryPublished Online: 28 Sep 2019 CITATION INFORMATION Baochun Li, Gaofeng Ye*, Letian Zhang, Wenbo Wei, and Sheng Jin, (2019), "Temperature analysis of the upper mantle in the North China Craton based on a three-dimensional magnetotelluric conductivity model," SEG Global Meeting Abstracts : 29-32. https://doi.org/10.1190/GEM2019-008.1 Plain-Language Summary Keywordsmagnetotelluricconductivity electromagneticPDF DownloadLoading ...