Collaborative Research: Volcanic Record in Antarctic Ice: Implications for Climatic and Eruptive History and Ice Sheet Dynamics of the South Polar Region

摘要南极冰盖是保存火山喷发的火山灰层和化学气溶胶特征记录的理想场所。这一记录既存在于裸露的蓝冰区域，也存在于深冰芯中，包括当地火山爆发的记录，也包括来自更遥远火山源的火山爆发的记录，这些火山源的玻璃碎片可以被化学指纹化，并与火山源有关。1994/1995年南极考察季期间在南极洲Allan Hills地区进行的野外工作，以及随后的微束化学分析和40Ar/39Ar定年表明，南极冰层深层的冰层保存了连贯、系统的地层学，可以成功地绘制地图、定年、化学指纹并与火山源联系起来。玻璃碎片的化学指纹鉴定和与火山灰层相关的火山气溶胶的化学分析相结合，将有助于建立当地和遥远火山活动的高分辨率年表，从而有助于了解重大爆炸性火山活动的模式，以及与火山爆发相关的大气负荷和气候影响。在南极横贯山脉的许多地方已经发现了蓝色冰区中各个层或层组的相互关系，这将使人们更好地了解这些地区冰流的几何形状，并将为解释冰芯记录提供有用的基础。

Dunbar/Kyle OPP 9527373 Zielinski OPP 9527824 Abstract The Antarctic ice sheets are ideal places to preserve a record the volcanic ash (tephra) layers and chemical aerosol signatures of volcanic eruptions. This record, which is present both in areas of bare blue ice, as well as in deep ice cores, consists of a combination of local eruptions, as well as eruptions from more distant volcanic sources from which glassy shards can be chemically fingerprinted and related to a source volcano. Field work carried out during the 1994/1995 Antarctic field season in the Allan Hills area of Antarctica, and subsequent microbeam chemical analysis and 40Ar/39Ar dating has shown that tephra layers in deep Antarctic ice preserve a coherent, systematic stratigraphy, and can be successfully mapped, dated, chemically fingerprinted and tied to source volcanoes. The combination of chemical fingerprinting of glass shards, and chemical analysis of volcanic aerosols associated with ash layers will allow establishment of a high-resolution chronology of local and distant volcanism that can help understand patterns of significant explosive volcanisms and atmospheric loading and climactic effects associated with volcanic eruptions. Correlation of individual tephra layers, or sets of layers, in blue ice areas, which have been identified in many places the Transantarctic Mountains, will allow the geometry of ice flow in these areas to be better understood and will provide a useful basis for interpreting ice core records.