Style of fluid flow and deformation in and around an ancient out-of-sequence thrust: An example from the Nobeoka Tectonic Line in the Shimanto accretionary complex, Southwest Japan

Hideki Mukoyoshi, Tetsuro Hirono, Hidetoshi Hara, Kotaro Sekine, Noriyoshi Tsuchiya, Arito Sakaguchi, Wonn Soh

研究成果: Article査読

20 被引用数 (Scopus)

抄録

To understand the characteristics of deformation of an out-of-sequence thrust (OST) and the style of fluid flow along it, we investigated the Nobeoka Tectonic Line, which has been interpreted as a deep OST (7-9 km), in the Shimanto accretionary complex, Southwest Japan. The shear zone in the footwall differs significantly in the along-strike direction not only in thickness, which varied from 100 to 300m, but also in lithology and mineral vein development. These variations might reflect primarily differences in lithology; that is, the sandstone-dominant shear zone with a large amount of mineral veins precipitated in microcracks is relatively thick, whereas the shale-dominant shear zone with a small amount of veins and with textures indicating highly pressurized pore fluid, is thinner. By comparison with characteristics of a shallow OST (3-5 km), we conclude that the shallow OST has experienced repeated brittle failure with rapid slip and focused fluid flow whereas the deep OST has experienced both brittle and ductile deformation, followed by fluid flow of various styles, depending on the lithology.

本文言語English
ページ(範囲)333-351
ページ数19
ジャーナルIsland Arc
18
2
DOI
出版ステータスPublished - 2009 6 16

ASJC Scopus subject areas

  • 地質学

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