Comparison of petrofabrics with composite magnetic fabrics of S-C mylonite in paramagnetic granite

Takaaki Ono, Yukinobu Hosomi, Hiroyoshi Arai, Hideo Takagi*

*この研究の対応する著者

研究成果: Article査読

14 被引用数 (Scopus)

抄録

An anisotropy of magnetic susceptibility (AMS) analysis was conducted for a typical S-C mylonite in a small-scale ductile shear zone derived from Late Cretaceous magnetite- free granite in the Ryoke Belt, Teshima Island, southwest Japan. In such mylonites, paramagnetic minerals such as biotite and hornblende, which define foliations, are assumed to control the AMS. Accordingly, we attempted to measure the orientations of both minerals to correlate the S-C-C′ fabric to the AMS using techniques of microscopic and back-scattered electron (BSE) image analyses. A measured magnetic fabric of the S-C mylonite that is expressed by a Kmin normal plane (Kmax-Kint plane) approximated S foliation, Kmax orientation coincided well with the orientations of mean resultant vectors for long axes of biotite and minor hornblende, whereas Kmax did not coincide well with those of the mean resultant vectors for long axes of the brighter domain (aggregates of biotite and minor hornblende) from the binary BSE image. These results show that the magnetic fabric fairly reflects the shape preferred orientation of individual grains of paramagnetic monoclinic minerals, especially biotite, which forms the S-C-C′ fabric.

本文言語English
ページ(範囲)2-14
ページ数13
ジャーナルJournal of Structural Geology
32
1
DOI
出版ステータスPublished - 2010 1月

ASJC Scopus subject areas

  • 地質学

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