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Secondary remanent magnetization carried by magnetite inclusions in silicates: a comparative study of unremagnetized and remagnetized granites |
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| Authors: | Yo-ichiro Otofuji Koji Uno Takahiro Higashi Tomomichi Ichikawa Tsuyoshi Ueno Toshiaki Mishima Takaaki Matsuda |
| Institution: | a Department of Earth and Planetary Sciences, Faculty of Science, Kobe University, Kobe 657, Japan b Department of Geology, Faculty of Science, Himeji Institute of Technology, Himeji 671-22, Japan |
| Abstract: | Magnetic carriers in remagnetized Cretaceous granitic rocks of northeast Japan were studied using paleomagnetism, rock magnetism, optical microscopy and scanning electron microscopy (SEM) by comparison with unremagnetized granitic rocks. The natural remanent magnetization (NRM) of the remagnetized rocks is strong (0.3–1.7 A/m) and shows a northwesterly direction with moderate inclination (NW remanence), whereas the unremagnetized rocks preserve weak NRM (<0.5 A/m) with westerly and shallow direction (W remanence). Although thermal demagnetization shows that both NRMs are carried by magnetite, the remagnetized rocks reveal a higher coercivity with respect to alternating field demagnetization (20 mT |
| Keywords: | paleomagnetism natural remanent magnetism remagnetization magnetite inclusions Honshu |
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