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The progressive development of microfabrics from initial deposition to slump deformation: an example from a modern sedimenary mélange on the Nankai Prism

Mebae Kuranaga, View ORCID ProfileKiichiro Kawamura and View ORCID ProfileToshiya Kanamatsu
Journal of the Geological Society, 177, 619-628, 9 June 2019, https://doi.org/10.1144/jgs2018-218
Mebae Kuranaga
1Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-city, Yamaguchi 753-8512, Japan
2Taiheiyo Consultant Co. Ltd, 2-2-4 Daisaku, Sakura-city, Chiba 285-0802, Japan
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Kiichiro Kawamura
1Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-city, Yamaguchi 753-8512, Japan
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  • ORCID record for Kiichiro Kawamura
  • For correspondence: kiichiro@yamaguchi-u.ac.jp
Toshiya Kanamatsu
3Japan Agency for Marine Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa 237-0046, Japan
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  • ORCID record for Toshiya Kanamatsu
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Abstract

The progressive development of microfabrics from initial deposition to slump deformation and then a submarine slide was investigated in an active subduction zone using cores recovered during the Integrated Ocean Drilling Program Expedition 333. A Pleistocene–Holocene sequence was recovered at Site C0018A, which was located on a slope basin on the footwall of the megasplay fault in the Nankai Trough, SW Japan. Six mass-transport deposit units intercalated with coherent intervals were recovered from the upper 190 m of the drilled succession. The initial microfabrics in the undeformed hemipelagic sediments were characterized by random and porous fabrics composed predominantly of clay aggregations and connectors. The initial fabrics were cardhouse fabrics, which consist of clay flakes with edge-to-edge (E–E) and/or edge-to-face (E–F) contacts. These initial microfabrics developed into compacted microfabrics, which are random and consolidated fabrics (bookhouse fabrics) that consist of clay flakes with E–F and/or face-to-face (F–F) contacts and develop during burial as a pure shear deformation. During slumping, these fabrics were then deformed under simple shear to become predominantly F–F contacts and form clay chains. Thus, the microfabrics in these submarine slides are a sedimentary mélange that developed locally into a preferred clay orientation with F–F contacts.

Supplementary material: A schematic illustration showing sedimentation processes and fabrics is available at https://doi.org/10.6084/m9.figshare.c.4483385

Thematic collection: This article is part of the Polygenetic mélanges collection available at: https://www.lyellcollection.org/cc/polygenetic-melanges

  • © 2019 The Author(s). Published by The Geological Society of London. All rights reserved
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Journal of the Geological Society: 177 (3)
Journal of the Geological Society
Volume 177, Issue 3
May 2020
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The progressive development of microfabrics from initial deposition to slump deformation: an example from a modern sedimenary mélange on the Nankai Prism

Mebae Kuranaga, Kiichiro Kawamura and Toshiya Kanamatsu
Journal of the Geological Society, 177, 619-628, 9 June 2019, https://doi.org/10.1144/jgs2018-218
Mebae Kuranaga
1Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-city, Yamaguchi 753-8512, Japan
2Taiheiyo Consultant Co. Ltd, 2-2-4 Daisaku, Sakura-city, Chiba 285-0802, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Kiichiro Kawamura
1Graduate School of Science and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi-city, Yamaguchi 753-8512, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Kiichiro Kawamura
  • For correspondence: kiichiro@yamaguchi-u.ac.jp
Toshiya Kanamatsu
3Japan Agency for Marine Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa 237-0046, Japan
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Toshiya Kanamatsu

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The progressive development of microfabrics from initial deposition to slump deformation: an example from a modern sedimenary mélange on the Nankai Prism

Mebae Kuranaga, Kiichiro Kawamura and Toshiya Kanamatsu
Journal of the Geological Society, 177, 619-628, 9 June 2019, https://doi.org/10.1144/jgs2018-218
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