Rock-magnetic properties of single zircon crystals sampled from the Tanzawa tonalitic pluton, central Japan
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- 作者：Masahiko Sato ; Shinji Yamamoto ; Yuhji Yamamoto ; Yoshihiro Okada…
- 关键词：Rock ; magnetism ; Paleointensity ; Zircon ; Tanzawa tonalitic pluton
- 刊名：Earth, Planets and Space
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：67
- 期：1
- 全文大小：3907KB
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Tarduno JA, Cottrell RD, Nimmo F, Hopkins J, Voronov J, Erickson A, Blackman E, Scott ERD, - 作者单位：Masahiko Sato (1) (2)
Shinji Yamamoto (3)
Yuhji Yamamoto (4)
Yoshihiro Okada (5)
Masao Ohno (2)
Hideo Tsunakawa (5)
Shigenori Maruyama (6)
1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, 305-8567, Japan
2. Department of Environmental Changes, Faculty of Social and Cultural Studies, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
3. Department of Earth and Astronomy, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan
4. Center for Advanced Marine Core Research, Kochi University, B200 Monobe, Kochi, 783-8502, Japan
5. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
6. Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan - 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
- 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
- 出版者：Springer Berlin Heidelberg
- ISSN：1880-5981
文摘
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?×-0?2 Am2, while natural remanent magnetization (NRM) intensities (M NRM) are below 4?×-0?2 Am2, indicating that these crystals are inappropriate for the paleomagnetic study. For the samples that had values of M NRM?≥-?×-0?2 Am2 and M IRM?≥-?×-0?2 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 (<10 mT) and low M NRM/M IRM values (<~0.1), main remanence carriers seem to be nearly pure magnetite with pseudo-single-domain grain sizes, and these samples are expected to appropriate for the paleointensity study. Total thermoremanent magnetization (TRM) acquisition experiments were also carried out for 12 samples satisfying the above criteria. The TRM intensity was comparable with that of NRM, and a rough estimation of the paleointensity using NRM/TRM ratios shows field intensities consistent with the average geomagnetic field intensity at the Tanzawa tonalitic pluton for last 5 Myr. Keywords Rock-magnetism Paleointensity Zircon Tanzawa tonalitic pluton