Deformation path of amygdules in basic schists in Itoshima area, northern Kyushu, Japan

Yukiko Yamasaki, Takeshi Ikeda

研究成果: ジャーナルへの寄稿記事

抄録

A deformation path of amygdules in basic schists that underwent contact metamorphism in Itoshima area, northern Kyushu, Japan, has been revealed using shape and internal microstructure of the amygdules. The amygdules are filled mainly with plagioclase that was recrystallized during the contact metamorphism. Crystal size of the plagioclase decreases with increasing aspect ratio of the amygdules. Some amygdules with low-aspect ratio contain plagioclase showing flat twin boundaries. This suggests that such amygdules were undeformed after peak of the contact metamorphism and preserved the strain accumulated until then, which probably includes prograde stage of the contact metamorphism and former regional Renge metamorphism. In contrast, the amygdules with high-aspect ratio underwent superimposition of deformation taking place after peak of the contact metamorphism. The strain analysis shows the constriction types for the former amygdules while the plane-strain types for the latter. This reveals a deformation path of the amygdules such that the constrictional strain before the peak of contact metamorphism was partially overprinted by later flattening strain, showing the apparent plane-strain types.

元の言語英語
記事番号e12246
ジャーナルIsland Arc
27
発行部数4
DOI
出版物ステータス出版済み - 7 1 2018

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contact metamorphism
schist
plagioclase
plane strain
strain analysis
regional metamorphism
microstructure
crystal

All Science Journal Classification (ASJC) codes

  • Geology

これを引用

Deformation path of amygdules in basic schists in Itoshima area, northern Kyushu, Japan. / Yamasaki, Yukiko; Ikeda, Takeshi.

:: Island Arc, 巻 27, 番号 4, e12246, 01.07.2018.

研究成果: ジャーナルへの寄稿記事

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