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，以重建不列颠哥伦比亚省（加拿大）南部科迪勒拉冰盖的中更新世和晚更新世冰川历史。来自穆迪港（不列颠哥伦比亚省）的沉积物岩心含有沉积物，记录了至少4个区域冰盖的进展，并形成了本次调查的基础。将利用X射线荧光分析法和电感耦合等离子体原子发射光谱法，对取自该钻孔岩芯的沉积物样品进行主量元素和微量元素成分分析。为了改进岩芯的年代学框架，应测量额外的放射性碳年龄，并将火山灰沉积物作为独立的时间标志进行调查。该核心将作为一个参考档案，以关联区域冰川沉积物，并把这些在一个改进的时间框架。此外，还将测试冰川沉积物的地球化学特征是否允许追溯其各自的来源。这一信息将用于限制在各冰川消退过程中淡水排入太平洋的时间。此外，还将研究沉积物芯中的微体化石（硅藻、有孔虫），以重建更新世中期至晚期的相对海平面。此外，应使用X射线荧光分析测试试探性纹层在年度至千年时间尺度上获取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.