Relative paleointensity estimates from magnetic anisotropy: Proof of concept

doi:10.1016/j.epsl.2019.05.003

CORC > 地质与地球物理研究所 > 中国科学院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

	Relative paleointensity estimates from magnetic anisotropy: Proof of concept
	Gilder, Stuart A.1; He, Kuang 1,3; Wack, Michael 1; Jezek, Josef 2
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2019-08-01
卷号	519 页码:83-91
关键词	relative paleointensity magnetic fabric sediments numerical modeling
ISSN号	0012-821X
DOI	10.1016/j.epsl.2019.05.003
英文摘要	Relative paleointensity data from sedimentary rocks play an important role to decipher the workings of the geodynamo and to correct for atmospheric cosmogenic radionucleide production, so it is important to understand how sediments acquire remanent magnetizations and to better assess the quality of relative paleointensity data. We present experimental results from sediments deposited in controlled magnetic fields to observe the changes in magnetic anisotropy as a function of applied field strength going from near Earth-like values to almost full saturation. Relative paleointensity values followed a very well defined power law through the entire range of applied field intensities. Magnetic remanence fabrics evolved from oblate with maximum anisotropy axes in the sedimentary plane at low field strengths to prolate with maximum anisotropy axes parallel to the applied field direction at high fields. Anisotropy of magnetic susceptibility also evolved with field strength, but in a much less coherent manner than anisotropy of magnetic remanence. The experiments used well-characterized, natural sediments containing single domain magnetite, which made it possible to numerically model the data. The model matches the field dependency of both relative paleointensity and magnetic fabric development using a simple assumption that a large proportion (similar to 80%) of the remanence carriers in the sediments are unable to align with the magnetic field while a small fraction are free to align. Anisotropy of magnetic remanence thus holds promise to improve and assess relative paleointensity estimates and helps improve theoretical treatment of magnetic recording in sediments. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	Deutsche Forschungsgemeinschaft[GI712/16-1] ; China Scholarship Council[201306180017]
WOS关键词	DEPOSITIONAL REMANENT MAGNETIZATION ; MAGNETOTACTIC BACTERIA ; GEOMAGNETIC-FIELD ; ACQUISITION ; INTENSITY ; SUSCEPTIBILITY ; REVERSAL ; MOMENT ; BE-10 ; MODEL
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000472689200008
资助机构	Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; China Scholarship Council ; China Scholarship Council ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; China Scholarship Council ; China Scholarship Council ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; China Scholarship Council ; China Scholarship Council ; Deutsche Forschungsgemeinschaft ; Deutsche Forschungsgemeinschaft ; China Scholarship Council ; China Scholarship Council
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92491]
专题	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	Gilder, Stuart A.
作者单位	1.Ludwig Maximilians Univ Munchen, Dept Earth & Environm Sci, Munich, Germany 2.Charles Univ Prague, Fac Sci, Prague, Czech Republic 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Gilder, Stuart A.,He, Kuang,Wack, Michael,et al. Relative paleointensity estimates from magnetic anisotropy: Proof of concept[J]. EARTH AND PLANETARY SCIENCE LETTERS,2019,519:83-91.
APA	Gilder, Stuart A.,He, Kuang,Wack, Michael,&Jezek, Josef.(2019).Relative paleointensity estimates from magnetic anisotropy: Proof of concept.EARTH AND PLANETARY SCIENCE LETTERS,519,83-91.
MLA	Gilder, Stuart A.,et al."Relative paleointensity estimates from magnetic anisotropy: Proof of concept".EARTH AND PLANETARY SCIENCE LETTERS 519(2019):83-91.