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Sediment deposition in the central Hauraki Gulf, New Zealand
Geo-Marine Letters ( IF 2.1 ) Pub Date : 2019-08-10 , DOI: 10.1007/s00367-019-00583-1
Florian Boxberg , Brice Blossier , Willem P. de Lange , Bethany Fox , Dierk Hebbeln

Based on the analysis of 14 short sediment cores, we present new insights into the distribution of surficial sediments in the central Hauraki Gulf, a semi-enclosed coastal embayment on the northeast coast of New Zealand’s North Island. We identify and discuss the effects of interaction of modern wind-generated waves and currents with regard to deposition and reworking of sediments in the Gulf. The modern hydrodynamic regime is controlled by tidal currents, oceanic inflows, and wave-induced currents and it is responsible for a N-S gradient in sediment texture and elemental concentrations in the central Hauraki Gulf sediments. The present-day sediment input into the system is generally low and consists of fine-grained fluvial sediments mostly deposited in the southern study area and comparatively high inputs of relict carbonate material to the northern study sites. The central Hauraki Gulf sediments, which show numerous age reversals in the sedimentary record, can be characterised as palimpsest sediments, as a consequence of continuous reworking and storm-induced sediment transport. In view of the new data, a previously assumed significant post-transgression accumulation of sediments of > 10 m in the central Hauraki Gulf appears to be very unlikely.

中文翻译:

新西兰豪拉基湾中部的沉积物沉积

基于对 14 个短沉积岩心的分析,我们对 Hauraki 湾中部(新西兰北岛东北海岸的一个半封闭沿海海湾)的表层沉积物分布提出了新见解。我们确定并讨论了现代风产生的波浪和洋流对海湾沉积物沉积和再加工的相互作用的影响。现代水动力状态受潮汐流、海洋流入和波浪感应流控制,它是造成中央豪拉基湾沉积物中沉积物质地和元素浓度的 NS 梯度的原因。目前该系统的沉积物输入量普遍较低,主要由细粒河流沉积物组成,主要沉积在南部研究区,而北部研究地点的残余碳酸盐物质输入量相对较高。中央豪拉基湾沉积物在沉积记录中显示出许多年龄逆转,可以将其描述为最古老的沉积物,这是连续再加工和风暴引起的沉积物迁移的结果。鉴于新数据,先前假设的在 Hauraki 海湾中部 > 10 m 的沉积物在海侵后积累的显着积累似乎是非常不可能的。由于持续的再加工和风暴引起的沉积物迁移。根据新数据,先前假设的在 Hauraki 海湾中部 > 10 m 的沉积物发生显着的海侵后堆积似乎不太可能。由于持续的再加工和风暴引起的沉积物迁移。鉴于新数据,先前假设的在 Hauraki 海湾中部 > 10 m 的沉积物在海侵后积累的显着积累似乎是非常不可能的。
更新日期:2019-08-10
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