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Sediment deposition in the central Hauraki Gulf, New Zealand

机译:新西兰豪拉基湾中部的沉积物沉积

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titleAbstract/titlepBased 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./p
机译:摘要 通过对14个短沉积物岩心的分析,对新西兰北岛东北海岸半封闭海岸湾中部豪拉基湾地表沉积物的分布提出了新的认识。我们确定并讨论了现代风产生的波浪和洋流相互作用对海湾沉积物沉积和再加工的影响。现代水动力机制受潮汐流、海洋流入和波浪引起的水流控制,它负责豪拉基湾中部沉积物中沉积物质地和元素浓度的 N-S 梯度。目前进入该系统的沉积物输入量通常较低,包括主要沉积在南部研究区的细粒河流沉积物和北部研究地点的相对较高的孑遗碳酸盐物质输入。豪拉基湾中部沉积物在沉积记录中显示出许多年龄逆转,由于不断的返工和风暴引起的沉积物输送,可以被描述为最苍白的沉积物。根据新数据,以前假设豪拉基湾中部>?10?m的沉积物在侵入后大量堆积似乎不太可能。

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