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Erosional features as indicators of thrust fault activity (Nankai Trough, Japan).

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Title: Erosional features as indicators of thrust fault activity (Nankai Trough, Japan).
Authors: Alves, Tiago M.1 alvest@cardiff.ac.uk, Strasser, M.2, Moore, G.F.3
Source: Marine Geology. Oct2014, Vol. 356, p5-18. 14p.
Subjects: Thrust faults (Geology), Erosion, Mass transfer, Accretion (Chemistry)
Geographic Terms: Nankai Trough
Abstract: A submarine channel system and basal ramps of a Quaternary mass-transport deposit (MTD) are shown to represent thrust fault activity in the Nankai accretionary wedge. Variations in channel bed slope, height and width of submarine channels and gullies indicate uplift and sediment bypass seaward from a margin-dominating out-of-sequence thrust, the megasplay fault (MSF), at < 1.67–1.46 Ma. Between ~ 1.05 and 0.85 Ma, a younger mass-transport deposit (MTD 6) was detached at different depths. Demonstrating the significant deformation observed in the study area, the direction of transport of MTD 6 differs 30°–45° from the strike of scarps and ramps at its base, which are parallel to the structural contours of thrust anticlines underneath. This character contrasts to the geometries frequently documented in frontally-emergent submarine landslides. Oblique basal ramps form significant boundaries between zones of MTD 6 with distinct acoustic and, suggestively, petrophysical properties. As a result of this study, we postulate that developed channel systems can erode the upper continental slope and lead to bypass of substantial volumes of sediment to distal parts of accretionary wedges. This process bears the potential of generating periods of more intense thrust-wedge deformation than those predicted by mathematical and physical models based on present-day taper geometries. On a regional scale, the observations in this paper are important as they indicate a more diffuse distribution of deformation in the Nankai accretionary wedge than previously assumed for the MSF region. [ABSTRACT FROM AUTHOR]
Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 98480171
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  Data: Erosional features as indicators of thrust fault activity (Nankai Trough, Japan).
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Alves%2C+Tiago+M%2E%22&quot;&gt;Alves, Tiago M.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt;&lt;i&gt; alvest@cardiff.ac.uk&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Strasser%2C+M%2E%22&quot;&gt;Strasser, M.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Moore%2C+G%2EF%2E%22&quot;&gt;Moore, G.F.&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Marine+Geology%22&quot;&gt;Marine Geology&lt;/searchLink&gt;. Oct2014, Vol. 356, p5-18. 14p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Nankai+Trough%22&quot;&gt;Nankai Trough&lt;/searchLink&gt;
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  Data: A submarine channel system and basal ramps of a Quaternary mass-transport deposit (MTD) are shown to represent thrust fault activity in the Nankai accretionary wedge. Variations in channel bed slope, height and width of submarine channels and gullies indicate uplift and sediment bypass seaward from a margin-dominating out-of-sequence thrust, the megasplay fault (MSF), at &lt; 1.67–1.46 Ma. Between ~ 1.05 and 0.85 Ma, a younger mass-transport deposit (MTD 6) was detached at different depths. Demonstrating the significant deformation observed in the study area, the direction of transport of MTD 6 differs 30&#176;–45&#176; from the strike of scarps and ramps at its base, which are parallel to the structural contours of thrust anticlines underneath. This character contrasts to the geometries frequently documented in frontally-emergent submarine landslides. Oblique basal ramps form significant boundaries between zones of MTD 6 with distinct acoustic and, suggestively, petrophysical properties. As a result of this study, we postulate that developed channel systems can erode the upper continental slope and lead to bypass of substantial volumes of sediment to distal parts of accretionary wedges. This process bears the potential of generating periods of more intense thrust-wedge deformation than those predicted by mathematical and physical models based on present-day taper geometries. On a regional scale, the observations in this paper are important as they indicate a more diffuse distribution of deformation in the Nankai accretionary wedge than previously assumed for the MSF region. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Marine Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.margeo.2013.07.011
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 5
    Subjects:
      – SubjectFull: Thrust faults (Geology)
        Type: general
      – SubjectFull: Erosion
        Type: general
      – SubjectFull: Mass transfer
        Type: general
      – SubjectFull: Accretion (Chemistry)
        Type: general
      – SubjectFull: Nankai Trough
        Type: general
    Titles:
      – TitleFull: Erosional features as indicators of thrust fault activity (Nankai Trough, Japan).
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Alves, Tiago M.
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            NameFull: Strasser, M.
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            NameFull: Moore, G.F.
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          Dates:
            – D: 01
              M: 10
              Text: Oct2014
              Type: published
              Y: 2014
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              Value: 00253227
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            – Type: volume
              Value: 356
          Titles:
            – TitleFull: Marine Geology
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