Rapid Paleoenvironmental Changes in the McMurdo Sound Region Recorded in Sediments: High-Resolution XRF-Scanning, ICP-MS analysis and physical-properties logging at ANDRILL Site MIS (IPY)

在ANDRILL-MIS项目期间，将首次从罗斯麦克默多冰架（南极洲）下面钻取1 000米厚的上新世-更新世沉积物序列。冰架的变化受南极冰盖的自然动态、海平面波动和冰架对气候变化的直接响应的控制。冰架变化的地质证据，在过去提出记录在不同的沉积物相在900米深的护城河盆地冰下。在MIS核心，我们提出了高分辨率的测量元素的浓度和沉积物的物理性质，分别使用一个XRF核心扫描仪和多传感器的核心记录仪。结合对离散样品的地球化学和沉积物成分调查，我们将提供一个校准的高分辨率多变量数据集，用于对超暖间冰期期间从完整冰川到开阔海洋条件的古环境变化进行复杂解释。沉积过程中产生的信号应与物源信号区分开来。我们的主要目标是更好地了解罗斯冰架的长期演变和稳定性，作为南极西部冰盖的重要组成部分，以评估在全球气候迅速变化的情况下，南极冰块对海平面和全球海洋环流的未来影响。

During the ANDRILL-MIS project, for the first time, a 1000 m thick Plio-Pleistocene sediment sequence will be drilled from underneath the Ross McMurdo Ice Shelf (Antarctica). The variations of the ice shelf are controlled by the natural dynamic of the Antarctic ice sheets, by sea level fluctuations and by direct response of the ice shelf to climate changes. Geological evidence of ice shelf variations in the past is proposed being documented in different sediment facies in a 900 m deep moat basin under the ice. On the MIS core we propose high-resolution measurements of elemental concentrations and sediment physical properties using an XRF-core scanner and a multi-sensor core logger, respectively. In combination with geochemical and sediment-component investigations on discrete samples we will provide a calibrated high-resolution multivariable data-set for complex interpretations of paleoenvironmental changes from full glacial to open marine conditions during super-warm interglacials. Signals generated during sedimentation should be discriminated from provenance signals. Our major goal is a better understanding of the long-term evolution and stability of the Ross Ice Shelf as important part of the West Antarctic Ice Sheet for assessing future impacts of Antarctic ice masses on sea level and global oceanic circulation in times of rapid global climate change.