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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Effects of depth- and composition-dependent thermal conductivity and the compositional viscosity ratio on the long-term evolution of large thermochemical piles of primordial material in the lower mantle of the Earth: Insights from 2-D numerical modeling

文献类型：期刊论文

作者Li, Yang2; Zhang, Zhigang1,4; Li, Juan1,4; Shi, Zhidong2,3,4; Zhao, Liang2,4
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2023-07-18
页码12
ISSN号1674-7313
关键词Mantle convection Thermal conductivity Core-mantle boundary heat flow Primordial mantle material LLSVPs
DOI10.1007/s11430-022-1111-6
英文摘要Thermal conductivity plays an important role in the thermochemical evolution of Earth's mantle. Recent mineral physics studies suggest that the thermal conductivity of the mantle varies with pressure and composition, and this may play an important role in the evolution of the Earth's mantle. Meanwhile, the rheology of the deep mantle is also supposed to be composition-dependent. However, the dynamic influences of these factors remain not well understood. In this study, we performed numerical experiments of thermochemical mantle convection in 2-D spherical annulus geometry to systematically investigate the effects of depth- and composition-dependent thermal conductivity and the compositional viscosity ratio on the long-term evolution of the large thermochemical structure of primordial material in Earth's mantle. Our results show that increasing the depth-dependent thermal conductivity leads to a larger core-mantle boundary (CMB) heat flow and allows the formation of more stable large thermochemical piles (e.g., Large Low Shear Velocity Provinces, LLSVPs); while decreasing the composition-dependent thermal conductivity would slightly destabilize the primordial thermochemical piles, increase the altitude of these piles and the temperature differences between the piles and the ambient mantle. If the primordial mantle material is compositionally more viscous (e.g., 20 times than that of the ambient mantle), the long-term stability of the thermochemical piles of primordial material decreases, and this destabilizing effect will be enhanced by decreasing the composition-dependent thermal conductivity. As a result, the thermochemical piles would be unstable in the core-mantle boundary region. Therefore, our study indicates that the combined effects of depth- and composition-dependent thermal conductivity and compositional viscosity ratio are pronounced to the thermochemical evolution of the mantle.
WOS关键词CONVECTION ; VELOCITY ; OCEAN ; CONSTRAINTS ; BRIDGMANITE ; EXPANSIVITY ; TRANSITION ; RESERVOIRS ; STABILITY ; CONTRASTS
资助项目National Natural Science Foundation of China[41888101] ; International Partnership Program of Chinese Academy of Sciences[132A11KYSB20200019] ; International Partnership Program of Chinese Academy of Sciences[GJHZ1776] ; Key Research Program of the Institute of Geology and Geophysics CAS[IGGCAS-201904] ; Key Research Program of the Institute of Geology and Geophysics CAS[IGGCAS-202204] ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)[311021003]
WOS研究方向Geology
语种英语
出版者SCIENCE PRESS
WOS记录号WOS:001033372600002
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; International Partnership Program of Chinese Academy of Sciences ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Key Research Program of the Institute of Geology and Geophysics CAS ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) ; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
源URL[http://ir.iggcas.ac.cn/handle/132A11/111312]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Li, Yang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519080, Peoples R China
4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Li, Yang,Zhang, Zhigang,Li, Juan,et al. Effects of depth- and composition-dependent thermal conductivity and the compositional viscosity ratio on the long-term evolution of large thermochemical piles of primordial material in the lower mantle of the Earth: Insights from 2-D numerical modeling[J]. SCIENCE CHINA-EARTH SCIENCES,2023:12.
APA Li, Yang,Zhang, Zhigang,Li, Juan,Shi, Zhidong,&Zhao, Liang.(2023).Effects of depth- and composition-dependent thermal conductivity and the compositional viscosity ratio on the long-term evolution of large thermochemical piles of primordial material in the lower mantle of the Earth: Insights from 2-D numerical modeling.SCIENCE CHINA-EARTH SCIENCES,12.
MLA Li, Yang,et al."Effects of depth- and composition-dependent thermal conductivity and the compositional viscosity ratio on the long-term evolution of large thermochemical piles of primordial material in the lower mantle of the Earth: Insights from 2-D numerical modeling".SCIENCE CHINA-EARTH SCIENCES (2023):12.

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来源：地质与地球物理研究所

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