Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan

Masahiko Sato, Shinji Yamamoto, Yuhji Yamamoto, Yoshihiro Okada, Masao Ohno, Hideo Tsunakawa, Shigenori Maruyama

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This paper reports on the rock-magnetic properties of single zircon crystals, which are essential for future work establishing the reliable paleointensity method using single zircon crystals. Zircon crystals used in this study were sampled from the Nakagawa River, which crosses the Tanzawa tonalitic pluton in central Japan. Rock-magnetic measurements were conducted on 1037 grains of zircons, but many of these measurements are below the limits of the sensitivity of the magnetometers employed. Isothermal remanent magnetizations (IRMs) of 876 zircon crystal are below the practical resolution of this study; we infer that these crystals contain no or only minute quantities of ferromagnetic minerals. The other zircon crystals contain enough magnetic minerals to be measured in the DC SQUID magnetometer. For 81 zircon crystals, IRM intensities (M IRM) are larger than 4∈×∈10-12 Am2, while natural remanent magnetization (NRM) intensities (M NRM) are below 4∈×∈10-12 Am2, indicating that these crystals are inappropriate for the paleomagnetic study. For the samples that had values of M NRM∈ ∈4∈×∈10-12 Am2 and M IRM∈ ∈4∈×∈10-12 Am2 (80 zircons), combining the rock-magnetic parameter, we proposed the sample-selection criteria for future study of paleointensity experiments using single zircon crystals. In the case that the samples had high coercivity (B c) values (>10 mT) or high M NRM/M IRM values (>∼0.1), main remanence carriers are probably pyrrhotite and these samples are inappropriate for the paleointensity study. In the case that the samples had low B c values (NRM/M IRM values (

Original languageEnglish
Article number150
JournalEarth, Planets and Space
Volume67
Issue number1
DOIs
Publication statusPublished - Dec 22 2015
Externally publishedYes

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magnetic property
pluton
Japan
zircon
remanent magnetization
rocks
crystal
natural remanent magnetization
magnetic properties
magnetization
single crystals
rock
crystals
magnetometer
magnetometers
minerals
magnetic mineral
pyrrhotite
remanence
rivers

Keywords

  • Paleointensity
  • Rock-magnetism
  • Tanzawa tonalitic pluton
  • Zircon

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

Cite this

Sato, M., Yamamoto, S., Yamamoto, Y., Okada, Y., Ohno, M., Tsunakawa, H., & Maruyama, S. (2015). Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan. Earth, Planets and Space, 67(1), [150]. https://doi.org/10.1186/s40623-015-0317-9

Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan. / Sato, Masahiko; Yamamoto, Shinji; Yamamoto, Yuhji; Okada, Yoshihiro; Ohno, Masao; Tsunakawa, Hideo; Maruyama, Shigenori.

In: Earth, Planets and Space, Vol. 67, No. 1, 150, 22.12.2015.

Research output: Contribution to journalArticle

Sato, Masahiko ; Yamamoto, Shinji ; Yamamoto, Yuhji ; Okada, Yoshihiro ; Ohno, Masao ; Tsunakawa, Hideo ; Maruyama, Shigenori. / Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan. In: Earth, Planets and Space. 2015 ; Vol. 67, No. 1.
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