Contourite drift systems form a significant component of the marine clastic sedimentary record. Although contourites form in all tectonic settings, few studies have described their development along convergent margins; such characterization is needed to underpin oceanographic and palaeoenvironmental studies in active settings. This study is the first to document contourite drift development along the Hikurangi subduction margin of New Zealand. Integration of bathymetric, seismic and well data enables five classes of drift to be recognized around the subduction wedge, occurring in three principal associations: (i) an upper slope drift association of giant elongate mounded (ca 150 km long, 50 km wide and up to 1100 m thick) and plastered drifts (ca 300 km long, 8 km wide and <600 m thick), which occurs upon and inboard of a major intrabasinal thrust‐cored high, whose long axis parallels the coast; shallow bottom currents disperse sub‐parallel to this axis; (ii) a spatiotemporally discontinuous association of confined and mounded hybrid drifts (ca 500 m long, <2 km wide and up to 500 m thick) that occurs along the mid‐to‐outer slope domain of the wedge, recording the interaction of along‐slope and downslope currents within trench‐slope basins; and (iii) a trench fill assemblage that implies the passage of abyssal bottom currents across a 40 km reach of the trench‐axial Hikurangi Channel‐levée, with associated modification of the channel form and of overbank sediment waves. The fundamental presence of contourites along this margin appears to depend on the orientation and strength of oceanographic bottom currents. However, drift type and evolution vary depending on the slope gradient and the presence of irregular seafloor topography created by tectonic structures. The documented drifts are generally smaller, less continuous, and develop more intermittently than similar styles of drifts documented on passive margins; this mode of occurrence may be characteristic of contourite development on convergent margins.

中文翻译：

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会聚边缘上轮廓石漂移的分布：以新西兰Hikurangi俯冲边缘为例

轮廓波漂移系统是海洋碎屑沉积记录的重要组成部分。尽管在所有的构造环境中都形成了contour石，但是很少有研究描述它们沿会聚边缘的发育。需要这样的表征来支持活跃环境中的海洋学和古环境研究。这项研究是第一个记录沿新西兰Hikurangi俯冲带边缘的轮廓岩漂移发展的研究。测深的整合，地震和钻井数据使五类漂移的周围的俯冲楔被识别，在三个主要关联发生：（ⅰ）巨细长的上斜率漂移关联堆砌（CA 150公里长，宽50公里，向上到厚1100米）和抹灰漂移（CA长300公里，宽8公里，<600 m厚），发生在一个主要的基底内推力高点的内侧，其长轴与海岸平行。浅水底电流散布在不平行于该轴的位置；（ii）时空不连续的局限性和冢性混合漂移（ca沿楔形的中外斜率区域长500 m，宽<2 km，最大厚度为500 m），记录了沟槽斜坡盆地内沿坡度和坡度流的相互作用；（iii）沟槽填充组合，意味着深槽底电流通过沟槽轴向Hikurangi通道-堤坝40 km的范围，同时对通道形式和岸上沉积物波进行了相应的修改。沿该边缘的轮廓石的基本存在似乎取决于海洋底流的方向和强度。然而，漂移的类型和演化取决于斜坡梯度和构造构造所形成的不规则海底地形的存在。已记录的漂移通常较小，连续性较小，并且比被动边距上记录的类似样式的漂移更断断续续地发展；这种发生方式可能是轮廓边缘在会聚边缘发育的特征。