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

合作研究：南极冰中的火山记录：对南极地区气候和喷发历史以及冰盖动力学的影响

• 批准号: 9527373
• 负责人: Nelia Dunbar
• 金额: $ 16.08万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-06-01 至 2000-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527373&HistoricalAwards=false
• 关键词: Collaborative; Research; Volcanic; Record; Antarctic

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.

Dunbar/Kyle Opp 9527373 Zielinski Opp 9527824摘要南极冰盖是保留记录火山灰（Tephra）层和火山喷发的化学气溶胶特征的理想场所。 这一记录都存在于裸露的蓝色冰区域以及深层冰芯中，包括当地喷发的结合，以及来自更遥远的火山源的喷发，可以从中可以化学指纹并与源火山相关。 在1994/1995年的南极野外季节进行的现场工作，随后的Microbeam化学分析和40AR/39AR约会表明，深南极冰中的Tephra层是一个相干的，系统的地层，并且可以连续地映射，化学映射，化学效果和化学效果。 玻璃碎片的化学指纹识别以及与烟灰层相关的火山气溶胶的化学分析将允许建立局部和遥远火山液的高分辨率年表，这些年代可以帮助理解重要的爆炸性火山爆发模式，大气负荷以及与伏尔期喷发相关的大气载荷和高潮作用。 蓝色冰区域中单个tephra层或一组层的相关性在许多地方被识别为跨巨山山，将使这些区域的冰流的几何形状得到更好的理解，并为解释冰核记录提供了有用的基础。