Precise U-Pb Dating of Plinian-Eruption Ashfalls for the Purpose of Time-Scale Calibration and Biostratigraphic Correlation

普林尼式火山喷发灰烬的精确 U-Pb 测年，用于时间尺度校准和生物地层相关性

• 批准号: 9219941
• 负责人: Robert Tucker
• 金额: $ 5.2万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219941&HistoricalAwards=false
• 关键词: Precise; Pb; Dating; Plinian; Eruption

PI will perform U-Pb (uranium-lead) dating of single-crystals and small multigrain fractions of phenocrystic zircon from well- characterized K-bentonites (ancient volcanic ash beds) in the Ordovician and Silurian stratotypes of Sweden, Britain and the central United States for the purpose of precise time-scale calibration and biostratigraphic correlation. The proposed research will produce an internally consistent and accurate absolute chronology of the Middle Ordovician through Upper Silurian stratotypes of Britain,and permit direct comparison of coeval but different fauna in North America, Scandinavia and the United Kingdom.

PI将对瑞典、英国和美国中部奥陶系和志留纪层型中特征良好的钾膨润岩(古火山灰层)中斑晶锆石的单晶和小颗粒斑晶锆石进行U-铅(铀-铅)测年，以进行精确的时间尺度校准和生物地层对比。拟议的研究将产生一个内部一致和准确的中奥陶世至英国上志留统层型的绝对年代学，并允许直接比较北美、斯堪的纳维亚半岛和联合王国的不同时代的动物群。