Regional and local paleostresses detected from orientations of clastic dikes around mud diapirs in the Miocene Tanabe Group, southwest Japan

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  • Abe Noriaki
    Division of Earth and Planetary Sciences, Kyoto University
  • Sato Katsushi
    Division of Earth and Planetary Sciences, Kyoto University

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Other Title
  • 泥ダイアピル周辺の砕屑岩脈の方位解析による広域応力と局所応力の検出：
  • 泥ダイアピル周辺の砕屑岩脈の方位解析による広域応力と局所応力の検出 : 中新統田辺層群の例
  • ドロ ダイアピル シュウヘン ノ サイクズガン ミャク ノ ホウイ カイセキ ニ ヨル コウイキ オウリョク ト キョクショ オウリョク ノ ケンシュツ : チュウ シントウタナベソウグン ノ レイ
  • 中新統田辺層群の例

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<p>Forearc basin fills in southwest Japan feature mud diapirs and many associated clastic dikes. The orientations of the clastic dikes allow estimates to be made of the regional tectonic paleostress field at the time of intrusion, although local and episodic changes in stress states may have been induced by the mud diapir intrusions. In this study, regional and local stresses were resolved from the analysis of clastic dike orientations in the Miocene Tanabe Group, southwest Japan. A normal-faulting stress with a WNW-ESE tension axis was common to all sub-areas, suggesting that the stress was regional and had a tectonic origin. This stress is broadly consistent with the N-S-trending maximum horizontal compression axis along the forearc of southwest Japan that prevailed in the early Middle Miocene.</p>

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