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

为了重建英属哥伦比亚（加拿大）南部科迪勒兰冰原的中更新世和晚更新世冰川历史，将测试一种地球化学方法。从Moody港（不列颠哥伦比亚省）提取的沉积物岩心包含了沉积物，这些沉积物记录了至少4个区域冰盖的推进，并为这次调查奠定了基础。利用x射线荧光分析和电感耦合等离子体原子发射光谱法对该岩心沉积物样品的主要和微量元素组成进行了表征。为了改进岩心的年代学框架，应测量额外的放射性碳年龄，并将碲矿床作为独立的时间标记进行研究。冰芯将作为一个参考档案，将区域冰川沉积物联系起来，并把它们放在一个改进的时间框架中。此外，还将测试冰川沉积物的地球化学特征是否允许追溯其各自的来源。这些信息将用于确定在各自的冰川消融过程中淡水流入太平洋的时间。此外，还将对沉积物岩心中的微化石（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在年至千年时间尺度上对其古气候相关信息的可能性。

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.