Grain boundary microcracking of granitic rocks from the northeastern region of the Atotsugawa fault, central Japan: SEM backscattered electron images

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書誌事項

公開日
1991-04
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
DOI
  • 10.1016/0013-7952(91)90044-l
  • 10.1016/0148-9062(91)91165-n
公開者
Elsevier BV

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説明

Abstract Backscattered electron (BSE) images from granitic rocks gathered in and around the northeastern region of the Atotsugawa fault in central Japan were examined by scanning electron microscopy. BSE images reveal that grain boundary microcracking strongly depends upon the mineralogy of the two adjacent grains. At grain boundaries, there are six possible different mineral pairings of the three main constituent minerals (quartz, plagioclase and K-feldspar) found in granitic rocks. Each grain boundary can be separated into one of two types; a partially to entirely open grain boundary or a closed grain boundary. Grain boundaries can be classified by their decreasing sense of openness: (1) quartz/feldspars (plagioclase and K-feldspars); (2) quartz/quartz; (3) piagioclase/plagioclase; (4) K-feldspar/plagioclase; and (5) K-feldspar/K-feldspar boundaries. Microcracks in grain boundaries are commonly found in a wide zone offset of the shattered zone of the fault. The number and types of partially to entirely open grain boundaries increase with proximity to the fault, following the above sequence. The number and types can be used to detail the special zoning of rock masses around a fault.

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