A new depositional model for the Tuaheni Landslide Complex, Hikurangi Margin, New Zealand

Couvin, Benjamin, Georgiopoulou, Aggeliki, Mountjoy, Joshu J., Amy, Lawrence, Crutchley, Gareth J., Brunet, Morgane, Cardona, Sebastian, Gross, Felix, Böttner, Christoph, Krastel, Sebastian and Pecher, Ingo (2020) A new depositional model for the Tuaheni Landslide Complex, Hikurangi Margin, New Zealand Subaqueous Mass Movements and their Consequences: Advances in Process Understanding, Monitoring and Hazard Assessments. Special Publications Geological Society London, 500 . UNSPECIFIED, London, N.N.. DOI 10.1144/SP500-2019-180.

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The Tuaheni Landslide Complex (TLC) is characterised by areas of compression upslope and extension downslope. It has been thought to consist of a stack of two genetically linked landslide units identified on seismic data. We use 3D seismic reflection, bathymetry data, and IODP core U1517C (Expedition 372), to understand the internal structures, deformation mechanisms and depositional processes of the TLC deposits. Unit II and Unit III of U1517C correspond to the two chaotic units in 3D seismic data. In the core, Unit II shows deformation whereas Unit III appears more like an in situ sequence. Variance attribute analysis shows that Unit II is split in lobes around a coherent stratified central ridge and is bounded by scarps. By contrast, we find that Unit III is continuous beneath the central ridge and has an upslope geometry that we interpret as a channellevee system. Both units show evidence of lateral spreading due to the presence of the Tuaheni Canyon removing support from the toe. Our results suggest that Unit II and Unit III are not genetically linked, that they are separated substantially in time and they had different emplacement mechanisms, but fail under similar circumstances.

Document Type: Book chapter
Keywords: depositional model, Tuaheni Landslide Complex, Hikurangi Margin, New Zealand, IODP Expedition 372
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Kiel University
DOI etc.: 10.1144/SP500-2019-180
ISSN: 0305-8719
Projects: IODP
Date Deposited: 17 Feb 2020 10:20
Last Modified: 17 Feb 2020 10:20
URI: http://eprints.uni-kiel.de/id/eprint/48993

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