气候变化领域集成服务门户(CCPortal): Assessment of Magnetic Techniques for Understanding Complex Mixtures of Magnetite and Hematite: The Inuyama Red Chert

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DOI	10.1029/2020JB019518
	Assessment of Magnetic Techniques for Understanding Complex Mixtures of Magnetite and Hematite: The Inuyama Red Chert
	Hu P.; Oda H.; Zhao X.; Harrison R.J.; Heslop D.; Sato T.; Muxworthy A.R.; Roberts A.P.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	Magnetite and hematite mixtures occur widely in nature. Magnetic unmixing of the signals recorded by these minerals can be important for assessing the origin of their respective paleomagnetic remanences and for extracting geological and paleoenvironmental information. However, unmixing magnetic signals from complex magnetite and hematite mixtures is difficult because of the weak magnetization and high coercivity of hematite. We assess here the relative effectiveness of first-order reversal curve (FORC) and extended FORC-type diagrams, FORC-principal component analysis (PCA), isothermal remanent magnetization (IRM) curve decomposition, and PCA of remanent hysteretic curves for unmixing magnetic components in samples from the magnetically complex Inuyama red chert, Japan. We also further characterize the domain state and coercivity distributions of both magnetite and hematite with FORC-PCA and IRM acquisition analysis in the red chert. We show that IRM curve decomposition can provide valuable component-specific information linked to coercivity, while FORC-PCA enables effective magnetic domain state identification. PCA of remanent hysteretic curves provides useful information about the most significant factors influencing remanence variations and subtle coercivity changes. To identify components in complex magnetite and hematite mixtures, we recommend PCA analysis of remanent hysteretic curves combined with FORC analysis of representative samples to identify domain states and coercivity distributions. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187414
作者单位	Research Institute of Geology and Geoinformation, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), AIST Tsukuba Central 7, Tsukuba, Ibaraki, Japan; Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London, United Kingdom
推荐引用方式 GB/T 7714	Hu P.,Oda H.,Zhao X.,et al. Assessment of Magnetic Techniques for Understanding Complex Mixtures of Magnetite and Hematite: The Inuyama Red Chert[J],2021,126(1).
APA	Hu P..,Oda H..,Zhao X..,Harrison R.J..,Heslop D..,...&Roberts A.P..(2021).Assessment of Magnetic Techniques for Understanding Complex Mixtures of Magnetite and Hematite: The Inuyama Red Chert.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Hu P.,et al."Assessment of Magnetic Techniques for Understanding Complex Mixtures of Magnetite and Hematite: The Inuyama Red Chert".Journal of Geophysical Research: Solid Earth 126.1(2021).