Study of Sediment, Glacier Ice and Silicate Spherules, Walcott Neve, Antarctica

这项拨款支持对南极东部边缘的研究 冰盖是一个非常敏感的区域，因为它的流动被 冰下基岩脊 由此产生的冰原暴露出 冰盖的地层剖面，包括 消融形成冰上冰碛的伟大时代。 的 本研究的目标包括：1）绘制表面 比尔德莫尔冰川地区的海拔和冰层厚度 为了记录基岩地形对当地 冰流模式：2）识别更新世- 基于氧同位素的露冰全新世界线 系统采集的冰样组成; 3）研究 在该地区的冰上冰碛中选择碎屑， 获取有关东南极地质的信息 克拉通;和4）地球化学，矿物学和同位素研究 在冰川中大量出现的硅酸盐小球 研究区域内的沉积物。

This grant supports a study of the margin of the East Antarctic ice sheet, a very sensitive area because its flow is disrupted by subglacial bedrock ridges. The resulting ice fields expose a stratigraphic section of the ice sheet including basal ice of great age which ablates to form supraglacial moraines. The objectives of this study include 1) mapping of the surface elevation and thickness of the ice in the Beardmore-Glacier area in order to document the effect of bedrock topography on local ice flow patterns: 2) identification of the Pleistocene- Holocene boundary in the exposed ice based on oxygen isotope compositions of systematically-collected ice samples; 3) study of selected clasts in supraglacial moraines of the area in order to obtain information about the geology of the East Antarctic craton; and 4) geochemical, mineralogical, and isotopic study of silicate spherules that occur in significant numbers in glacial sediment in the study area.