1/15
文档分类:文学/艺术/军事/历史

secondary remanent magnetization carried by magnetite inclusions in silicates a comparative study of unremagnetized and remagnetized granites开题资料.pdf


下载后只包含 1 个 PDF 格式的文档,没有任何的图纸或源代码,查看文件列表

特别说明:文档预览什么样,下载就是什么样。

下载所得到的文件列表
secondary remanent magnetization carried by magnetite inclusions in silicates a comparative study of unremagnetized and remagnetized granites开题资料.pdf
文档介绍:
Earth and Planetary Science Letters 180 (2000) 271^285
www.elsevier.com/locate/epsl
Secondary remanent magnetization carried by magnetite
inclusions in silicates: a comparative study of unremagnetized
and remagnetized granites
Yo-ichiro Otofuji a;*, Koji Uno a, Takahiro Higashi a, Tomomichi Ichikawa a,
Tsuyoshi Ueno a, Toshiaki Mishima a, Takaaki Matsuda b
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
Received 6 January 2000; received in revised form 6 April 2000; accepted 22 May 2000
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 ( 6 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 6 median destructive field) than the unremagnetized rocks
( 6 10 mT). On the basis of the modified Lowrie^Fuller test and hysteresis parameters, the unremagnetized rocks carry
multi-domain grains whereas the magnetic carrier of the remagnetized rocks is described as a mixture of multi- and
single-domain grains. Optical examination reveals that although common
内容来自淘豆网www.taodocs.com转载请标明出处.