Geotechnical and sediment physical characterization of glacial-interglacial cycles on a late Miocene to Holocene shelf-slope transect (Canterbury Basin, New Zealand)

该提案是为IODP远征317（新西兰坎特伯雷盆地）期间获得的样本和数据集的巡航后分析和处理而设计的。第317次考察的目的是了解全球海平面变化与局部构造和沉积过程在控制大陆边缘沉积旋回方面的相对重要性。在晚中新世至近代陆架坡样带的4个钻孔点上，研究了19个由高频层序地层学认识的区域性层序边界不整合面。首先，船上的结果表明，对不整合面的解释是有问题的，因为由裂缝和/或钻井过程造成的缺失层的厚度是未知的。这些信息的获取对于进一步开展年龄深度估算、岩性层序对比、二维逆剥等研究至关重要。一种吉祥的方法是，通过对不整合面上下地区的56个完整的样本进行岩土测量（土壤测量仪和沉积物强度测试），确定压实和脱水特性，从而重建“缺失的地层”。第二个目标是回答沉积物压实历史是否可以沿着大陆架斜坡样带水平追踪，并垂直追踪到沉积物深度超过980米的问题。这些结果以及对物理性质、井下测井和沉积学船载数据的进一步分析将支持对坎特伯雷盆地沉降和海平面变化的定量分析。

This proposal is designed for postcruise analyses of samples and processing of data sets gained during IODP Expedition 317 (Canterbury Basin, New Zealand). Expedition 317 was aimed to understand the relative importance of global sea level changes versus local tectonic and sedimentary processes in controlling continental margin sedimentary cycles. Nineteen regional sequence-bounding unconformities, know from high-frequency sequence stratigraphy, were investigated on four drill sites of a late Miocene to recent continental shelfslope transect. First onboard results show that the interpretation of the unconformities is problematical because the thicknesses of the missing intervals, caused by hiatuses and/or the drilling process, are unknown. For further investigations, e.g. age-depth estimation, lithological sequence correlation, two dimensional backstripping, it is crucial to get these information. An auspicious approach is the reconstruct of the “missing strata” on the basis of the determination of compaction and dewatering properties via geotechnical measurements (oedometer and sediment strength tests) on 56 whole-round samples from areas above and below the unconformities. A second goal is to respond to the question if the sediment compaction history can be traced horizontally across a shelf-slope transect and vertically down to a sediment depth of more than 980 m. The results and additional analyses of physical property, down-hole logging and sedimentological shipboard data will support the quantitative analysis of subsidence and sea level change in Canterbury Basin.