Collaborative Proposal: Late Cenozoic Volcanism and Glaciation at Minna Bluff, Antarctica: Implications for Antarctic Cryosphere History

合作提案：南极洲明纳悬崖晚新生代火山活动和冰川作用：对南极冰冻圈历史的影响

• 批准号: 0538413
• 负责人: William McIntosh
• 金额: $ 11.68万
• 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: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538413&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Late; Cenozoic; Volcanism

This project studies glaciovolcanic deposits at Minna Bluff in the western Ross Embayment of Antarctica. Its goal is to determine the history of the Ross Ice Shelf, which is fed by the major ice sheets from both East and West Antarctica. Apart from determining how these ice sheets waxed and waned during a period of dynamic climate change, glaciovolcanic sequences may constrain ice sheet parameters that are critical to numerical models such as thickness, hydrology, and basal thermal regime. This three-year study would map, analyze, and determine the age of key units using 40Ar/39Ar dating. Pilot studies would also be conducted for 36Cl dating of glacial deposits and stable isotope evaluations of alteration. The project offers a complementary record of Ross Ice Shelf behavior to that sampled by ANDRILL. It also improves the general record of McMurdo area volcanostratigraphy, which is important to interpreting landforms, glacial deposits, and ancient ice found in the Dry Valleys.The broader impacts of this project include improving society's understanding of global climate change, sea level rise, and graduate and undergraduate student education. Outreach efforts include educational programs for public schools and community groups, exhibits for a local science museum, and a project website.

本项目研究南极洲罗斯湾西部Minna Bluff的冰川火山沉积物。它的目标是确定罗斯冰架的历史，罗斯冰架是由来自南极洲东部和西部的主要冰盖提供的。除了确定这些冰盖在动态气候变化期间如何变暖和变弱之外，冰火序列还可能限制对数值模式至关重要的冰盖参数，如厚度、水文和基础热状态。这项为期三年的研究将利用40Ar/39Ar测年技术绘制、分析并确定关键单元的年龄。还将进行初步研究，对冰川沉积物进行36Cl测年和对蚀变进行稳定同位素评价。该项目为Ross冰架的行为提供了ANDRILL取样的补充记录。它还改善了麦克默多地区火山地层学的一般记录，这对于解释在干谷发现的地貌、冰川沉积物和古冰非常重要。该项目的更广泛影响包括提高社会对全球气候变化、海平面上升以及研究生和本科生教育的认识。拓展工作包括为公立学校和社区团体提供教育项目，为当地科学博物馆举办展览，以及建立一个项目网站。