Paleomagnetic Recording Efficiency of Sedimentary Magnetic Mineral Inclusions: Implications for Relative Paleointensity Determinations

Hong, Hoabin, Chang, Liao, Hayashida, Akira, Roberts, Andrew P, Heslop, David, Paterson, Greig A ORCID: 0000-0002-6864-7420, Kodama, Kazuto and Tauxe, Lisa
(2019) Paleomagnetic Recording Efficiency of Sedimentary Magnetic Mineral Inclusions: Implications for Relative Paleointensity Determinations. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 124 (7). pp. 6267-6279.

Access the full-text of this item by clicking on the Open Access link.


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.

Item Type: Article
Uncontrolled Keywords: magnetic mineral inclusions, relative paleointensity, detrital remanent magnetization
Depositing User: Symplectic Admin
Date Deposited: 12 Feb 2020 10:36
Last Modified: 19 Jan 2023 00:03
DOI: 10.1029/2018JB016859
Open Access URL:
Related URLs: