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

邓巴/凯尔OPP 9527373齐林斯基OPP 9527824南极冰盖是保存火山喷发的火山灰(Tephra)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色冰区，也存在于深厚的冰芯中，包括当地喷发以及来自更远火山来源的喷发，从这些来源可以提取玻璃碎片的化学指纹，并与源火山有关。1994/1995年在南极阿兰丘陵地区进行的实地考察以及随后的微束化学分析和40Ar/39Ar测年表明，南极深层冰中的特弗拉层保存了连贯和系统的地层学，可以成功地绘制地图、确定年代、提取化学指纹并与源火山联系在一起。玻璃碎片的化学指纹和与火山灰层有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，有助于了解重大喷发火山活动的模式以及与火山喷发有关的大气负荷和气候影响。对蓝色冰区中已在许多地方发现的横跨北极山脉的个别特弗拉层或层组进行对比，将使人们能够更好地了解这些地区的冰流几何形状，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.