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Megaclasts within mass-transport deposits: their origin, characteristics and effect on substrates and succeeding flows

View ORCID ProfileJefferson Nwoko, Ian Kane and View ORCID ProfileMads Huuse
Geological Society, London, Special Publications, 500, 515-530, 31 March 2020, https://doi.org/10.1144/SP500-2019-146
Jefferson Nwoko
School of Natural Sciences, University of Manchester, Oxford Road, , UK
Roles: [Writing - Original Draft (Lead)]
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  • ORCID record for Jefferson Nwoko
  • For correspondence: Cenjeff@ymail.com
Ian Kane
School of Natural Sciences, University of Manchester, Oxford Road, , UK
Roles: [Supervision (Lead)], [Writing - Review & Editing (Lead)]
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Mads Huuse
School of Natural Sciences, University of Manchester, Oxford Road, , UK
Roles: [Validation (Lead)], [Writing - Review & Editing (Supporting)]
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  • ORCID record for Mads Huuse
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Abstract

Megaclasts transported within submarine landslides can erode the substrate, influence the flow that transports them and, if they form seafloor topography, can influence subsequent flows and their deposits. We document grooves up to 40 km long formed by megaclasts carried in submarine landslides that scoured tens of metres deep into the contemporaneous substrate of the deep-water Taranaki Basin, New Zealand. A 1925 km2 3D seismic reflection survey records six mass transport deposits (MTDs) interbedded with turbidites. Here, we focus on three MTDs, labelled A (oldest), B and C (youngest). MTD-A features megaclasts that internally have coherent parallel strata, and formed striations 4–15 km long and 2–3 km wide, with protruding megaclasts that are onlapped by younger sediments. The seafloor expression of these megaclasts partially obstructed the submarine landslide that created MTD-B. MTD-B contains megaclasts that incised through the rugose topography of the underlying MTD-A, and formed divergent grooves on the basal surface of MTD-B (8–40 km long and 200–250 m wide), which suggest radial flow expansion where flows exited topographic confinement. MTD-C features grooves 2–6 km long and 100–200 m wide that terminate at megaclasts and which internally are characterized of highly deformed reflectors surrounded by a chaotic matrix. This study directly links megaclasts to the grooves they form, and demonstrates that markedly different styles of scouring and resultant grooves can occur in closely related MTDs.

  • © 2020 The Author(s). Published by The Geological Society of London. All rights reserved
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Geological Society, London, Special Publications: 500 (1)
Geological Society, London, Special Publications
Volume 500
2020
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Megaclasts within mass-transport deposits: their origin, characteristics and effect on substrates and succeeding flows

Jefferson Nwoko, Ian Kane and Mads Huuse
Geological Society, London, Special Publications, 500, 515-530, 31 March 2020, https://doi.org/10.1144/SP500-2019-146
Jefferson Nwoko
School of Natural Sciences, University of Manchester, Oxford Road, , UK
Roles: [Writing - Original Draft (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Jefferson Nwoko
  • For correspondence: Cenjeff@ymail.com
Ian Kane
School of Natural Sciences, University of Manchester, Oxford Road, , UK
Roles: [Supervision (Lead)], [Writing - Review & Editing (Lead)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
Mads Huuse
School of Natural Sciences, University of Manchester, Oxford Road, , UK
Roles: [Validation (Lead)], [Writing - Review & Editing (Supporting)]
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • ORCID record for Mads Huuse

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Megaclasts within mass-transport deposits: their origin, characteristics and effect on substrates and succeeding flows

Jefferson Nwoko, Ian Kane and Mads Huuse
Geological Society, London, Special Publications, 500, 515-530, 31 March 2020, https://doi.org/10.1144/SP500-2019-146
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