Variation in syn-subduction sedimentation patterns from inner to outer portions of deep-water fold and thrust belts: examples from the Hikurangi subduction margin of New Zealand

Abstract

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Distribution of contourite drifts on convergent margins: Examples from the Hikurangi subduction margin of New Zealand

“…The large‐scale architecture and seismic facies associations of both contouritic and non‐contouritic Hikurangi Margin sedimentary deposits can be defined using seismic data, some of which may be calibrated with well data. Five non‐contouritic seismofacies are defined in Table 2 (modified after McArthur et al ., 2019). These include muddy shelf clinothems, (hemi‐) pelagic muds, mass transport deposits, turbidites and seismic basement.…”

“…8G and I; sensu Faugères et al ., 1999, Juan et al ., 2018). Gravity currents and channel‐feeder systems develop turbidite channels, lobes and MTCs within these basins, and act as the siliclastic source to the otherwise sediment‐starved outer slope basins (McArthur et al ., 2019). Within the host trench‐slope basins, there is likely a process interplay between contour currents and gravity currents modifying both turbidite and contourite morphology.…”

“…Reverse, normal and strike‐slip faults trending ENE–SWS characterize the subduction zone, predominantly forming fold and thrust bounded trench‐slope basins (Fig. 2; Lewis & Pettinga, 1993; Bailleul, et al ., 2013; McArthur et al ., 2019). The obliquity of the subduction zone results in strain partitioning across the convergent interface (Nicol et al ., 2007; Wallace et al ., 2012).…”

“…(A) Non‐interpreted and (B) Interpreted regional north‐west/south‐east seismic cross‐line located in the southern portion of the subduction wedge, illustrating major intrabasinal structures, trench‐slope basins and interpreted horizons (modified from McArthur et al ., 2019). Data provided by WesternGeco.…”

“…A phase of mixed extension and compression occurred during the Middle to Late Miocene (Chanier et al ., 1999; Nicol et al ., 2007); compression continued in the remainder of the wedge thereafter through the Late Miocene to the present, with trench‐slope basins filling with deep‐water sediments (Lewis & Pettinga, 1993). During the Quaternary, rapid basement uplift occurred, resulting in the development of the present‐day fold and thrust belt and the modern oceanographic current configuration (Carter et al ., 2004; McArthur et al ., 2019).…”