Paleomagnetic recording efficiency of sedimentary magnetic mineral inclusions: implications for relative paleointensity determinations

Type Article
Date 2019-07
Language English
Author(s) Hong Hoabin1, Chang Liao1, 2, Hayashida Akira3, Roberts Andrew P.4, Heslop David4, Paterson Greig A.5, 6, Kodama Kazuto7, Tauxe Lisa8
Affiliation(s) 1 : Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University Beijing P. R. ,China
2 : Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology Qingdao P. R., China
3 : Department of Environmental Systems ScienceDoshisha University Kyoto, Japan
4 : Research School of Earth Sciences, Australian National University Canberra ,Australia
5 : Department of Earth, Ocean and Ecological SciencesUniversity of Liverpool Liverpool, UK
6 : Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing P. R. ,China
7 : Research Center for Knowledge Science in Cultural Heritage, Doshisha University Kyoto, Japan
8 : Scripps Institution of Oceanography, University of California San Diego La Jolla CA ,USA
Source Journal Of Geophysical Research-solid Earth (2169-9313) (American Geophysical Union (AGU)), 2019-07 , Vol. 124 , N. 7 , P. 6267-6279
DOI 10.1029/2018JB016859
WOS© Times Cited 2
Note This article also appears in: Magnetism in the Geosciences - Advances and Perspectives
Keyword(s) magnetic mineral inclusions, relative paleointensity, detrital remanent magnetization
Abstract

Sedimentary relative paleointensity (RPI) records are often carried by complex magnetic mineral mixtures, including detrital and biogenic magnetic minerals. Recent studies have demonstrated that magnetic inclusions within larger detrital silicate particles can make significant contributions to sedimentary paleomagnetic records. However, little is known about the role such inclusions play in sedimentary paleomagnetic signal recording. We analyzed paleomagnetic and mineral magnetic data for marine sediment core MD01‐2421 from the North Pacific Ocean, offshore of central Japan, to assess how magnetic inclusions and other detrital magnetic minerals record sedimentary paleomagnetic signals. Stratigraphic intervals in which abundant magnetic inclusions dominate the magnetic signal are compared with other intervals to assess quantitatively their contribution to sedimentary RPI signals. The normalized remanence record from core MD01‐2421 does not correlate clearly with global RPI stacks, which we attribute to a demonstrated lower paleomagnetic recording efficiency of magnetic inclusions compared to other detrital magnetic minerals. We also carried out the first laboratory redeposition experiments under controlled Earth‐like magnetic fields for particles with magnetic inclusions using material from core MD01‐2421. Our results confirm that such particles can be aligned by ambient magnetic fields, but with a lower magnetic recording efficiency compared to other detrital magnetic minerals, which is consistent with normalized remanence data from core MD01‐2421. Our demonstration of the role of sedimentary magnetic inclusions should have wide applicability for understanding sedimentary paleomagnetic recording.

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Hong Hoabin, Chang Liao, Hayashida Akira, Roberts Andrew P., Heslop David, Paterson Greig A., Kodama Kazuto, Tauxe Lisa (2019). Paleomagnetic recording efficiency of sedimentary magnetic mineral inclusions: implications for relative paleointensity determinations. Journal Of Geophysical Research-solid Earth, 124(7), 6267-6279. Publisher's official version : https://doi.org/10.1029/2018JB016859 , Open Access version : https://archimer.ifremer.fr/doc/00505/61685/