Reconstruction of the Middle to Late Pleistocene glaciation history of the southern Cordilleran Ice Sheet (Fraser Lowland, British Columbia) – a geochemical approach.

将测试一种地球化学方法，以重建加拿大不列颠哥伦比亚省南部科迪勒兰冰盖的中更新世和晚更新世冰川历史。来自不列颠哥伦比亚省穆迪港的一个沉积物岩芯含有沉积物，它记录了至少4个区域冰盖的进展，并构成了本次调查的基础。该钻芯的沉积物样品将使用X射线荧光分析和电感耦合等离子体原子发射光谱分析来表征其主要和微量元素组成。为了改进岩芯的年代学框架，应测量更多的放射性碳年龄，并将作为独立的时间标记物调查非洲的沉积。该核心将作为参考档案，将区域冰川沉积相互关联，并将其置于改进的时间框架中。此外，还将测试冰川沉积物的地球化学特征是否允许追溯它们各自的来源。这些信息将被用来限制在各自的冰川消融过程中向太平洋释放淡水的时间。此外，将对沉积岩芯中的微化石(硅藻、有孔虫)进行研究，以重建中更新世至晚更新世的相对海平面。此外，应利用x射线荧光分析来测试试探性变幅在年度至千年时间尺度上对其古气候相关信息的潜力。

A geochemical approach will be tested in order to reconstruct the Middle- and Late-Pleistocene glacial history of the Cordilleran Ice Sheet in southern British Columbia (Canada). A sediment core from Port Moody (British Columbia) contains sediments, which document at least 4 regional ice sheet advances and forms the basis for this investigation. Sediment samples from this drill core will characterized by their major and trace element composition using X-ray fluorescence analyses and inductively coupled plasma-atomic emission spectrometry. In order to improve the chronological framework of the core additional radiocarbon ages shall be measured and tephra deposits will be investigated as independent time markers. The core will serve as a reference archive to correlate regional glacial deposits and to put those in an improved temporal framework. Further it will be tested if the geochemical signature of glacial deposits allows tracing back their respective provenance. This information will be used to constrain the timing of freshwater release into the Pacific Ocean in the course of the respective deglaciations. Furthermore, microfossils (diatoms, foraminifera) from the sediment core will be studied in order to reconstruct the relative sea level during Mid- to Late Pleistocene. In addition the potential of tentative varves towards their paleoclimatically relevant information on annual to millennial time scales shall be tested using x-ray fluorescence analyses.