Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts

Abstract Marine magnetic anomalies are pivotal to our understanding of plate tectonics, geomagnetic fields, and deep Earth dynamics. However, the question of how Ti‐rich titanomagnetites, the primary remanence carriers in oceanic crust rocks, can faithfully preserve geomagnetic field information for...

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Main Authors: Fei Han, Huapei Wang, Yiliang Lv, Greig A. Paterson, Andrew J. Biggin, Wyn Williams, Tao Yang, Junxiang Miao, Ting Cao, Duowen Zhu, Chen Wen, Shaochen Hu, Xiaowei Chen, Mengqing Wang, Yiming Ma, Jiakun Fang, Jiabo Liu
Format: Article
Language:English
Published: Wiley 2025-05-01
Series:Geophysical Research Letters
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Online Access:https://doi.org/10.1029/2025GL115045
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author Fei Han
Huapei Wang
Yiliang Lv
Greig A. Paterson
Andrew J. Biggin
Wyn Williams
Tao Yang
Junxiang Miao
Ting Cao
Duowen Zhu
Chen Wen
Shaochen Hu
Xiaowei Chen
Mengqing Wang
Yiming Ma
Jiakun Fang
Jiabo Liu
author_facet Fei Han
Huapei Wang
Yiliang Lv
Greig A. Paterson
Andrew J. Biggin
Wyn Williams
Tao Yang
Junxiang Miao
Ting Cao
Duowen Zhu
Chen Wen
Shaochen Hu
Xiaowei Chen
Mengqing Wang
Yiming Ma
Jiakun Fang
Jiabo Liu
author_sort Fei Han
collection DOAJ
description Abstract Marine magnetic anomalies are pivotal to our understanding of plate tectonics, geomagnetic fields, and deep Earth dynamics. However, the question of how Ti‐rich titanomagnetites, the primary remanence carriers in oceanic crust rocks, can faithfully preserve geomagnetic field information for tens of millions of years is not well understood. Here, we combine microscopic, micromagnetic, and rock magnetic analyses, including 14‐T high‐field measurements, to show that the magnetic micro‐anisotropy of a fresh pillow lava dredged from the Juan de Fuca Ridge is dominated by internal stress throughout its chilled margin to its interior. Internal stress, which is generated primarily by the contraction of hot lava erupting into cold seawater, increased the natural remanent magnetization in this lava by a factor of ∼3. We suggest that stress‐induced magnetic domain state transformation from multidomain to single vortex (or single domain) in extrusive pillow lavas significantly enhances oceanic crustal magnetic remanence strength and stability.
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issn 0094-8276
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publishDate 2025-05-01
publisher Wiley
record_format Article
series Geophysical Research Letters
spelling doaj-art-e50e949b227048dfb43c4c2062f156662025-08-20T03:10:31ZengWileyGeophysical Research Letters0094-82761944-80072025-05-015210n/an/a10.1029/2025GL115045Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine BasaltsFei Han0Huapei Wang1Yiliang Lv2Greig A. Paterson3Andrew J. Biggin4Wyn Williams5Tao Yang6Junxiang Miao7Ting Cao8Duowen Zhu9Chen Wen10Shaochen Hu11Xiaowei Chen12Mengqing Wang13Yiming Ma14Jiakun Fang15Jiabo Liu16School of Geosciences Yangtze University Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaWuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan ChinaGeomagnetism Laboratory Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UKGeomagnetism Laboratory Department of Earth, Ocean and Ecological Sciences University of Liverpool Liverpool UKEarth and Planetary Science School of Geosciences University of Edinburgh Edinburgh UKSchool of Geophysics and Information Technology China University of Geosciences Beijing ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaSchool of Geosciences Yangtze University Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaState Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan ChinaPaleomagnetism and Planetary Magnetism Laboratory School of Geophysics and Geomatics China University of Geosciences Wuhan ChinaAbstract Marine magnetic anomalies are pivotal to our understanding of plate tectonics, geomagnetic fields, and deep Earth dynamics. However, the question of how Ti‐rich titanomagnetites, the primary remanence carriers in oceanic crust rocks, can faithfully preserve geomagnetic field information for tens of millions of years is not well understood. Here, we combine microscopic, micromagnetic, and rock magnetic analyses, including 14‐T high‐field measurements, to show that the magnetic micro‐anisotropy of a fresh pillow lava dredged from the Juan de Fuca Ridge is dominated by internal stress throughout its chilled margin to its interior. Internal stress, which is generated primarily by the contraction of hot lava erupting into cold seawater, increased the natural remanent magnetization in this lava by a factor of ∼3. We suggest that stress‐induced magnetic domain state transformation from multidomain to single vortex (or single domain) in extrusive pillow lavas significantly enhances oceanic crustal magnetic remanence strength and stability.https://doi.org/10.1029/2025GL115045pillow lavasstress‐dominated anisotropymicromagnetic modelsmagnetic domain transformations
spellingShingle Fei Han
Huapei Wang
Yiliang Lv
Greig A. Paterson
Andrew J. Biggin
Wyn Williams
Tao Yang
Junxiang Miao
Ting Cao
Duowen Zhu
Chen Wen
Shaochen Hu
Xiaowei Chen
Mengqing Wang
Yiming Ma
Jiakun Fang
Jiabo Liu
Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
Geophysical Research Letters
pillow lavas
stress‐dominated anisotropy
micromagnetic models
magnetic domain transformations
title Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
title_full Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
title_fullStr Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
title_full_unstemmed Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
title_short Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
title_sort marine magnetic anomalies enhanced by internal stress in rapidly cooled submarine basalts
topic pillow lavas
stress‐dominated anisotropy
micromagnetic models
magnetic domain transformations
url https://doi.org/10.1029/2025GL115045
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