Collaborative Proposal: Re-Assessing Hotspot Models in the Pacific Basin with High Resolution 40Ar/39Ar Dating of Volcanic Activity in the Line Islands & Louisville Seamount Tr

合作提案：利用莱恩群岛火山活动高分辨率 40Ar/39Ar 测年重新评估太平洋盆地热点模型

• 批准号: 0350991
• 负责人: Anthony Koppers
• 金额: --
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0350991&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Re; Assessing; Hotspot

ABSTRACTTo do a basin-wide test of the fixed hotspot model requires accurate and precise radiometric ages that only now have become possible through improvement in Ar40/Ar39 dating of altered submarine basalts. By re-dating existing samples the investigators will generate a state-of-the-art Ar40/Ar39 age database. This project will re-date 37 seamounts that fall within the 30-100 MA age range in the Line Islands and the Louisville seamounts incremental heating Ar40/Ar39 dating, and measure Hf-Sr-Nd-Pb isotopes and major/trace element abundances to characterize these basalts in terms of mantle source and stage of volcanic activity. These data will be used to assess the fixed and moving hotspot models.

要对固定热点模型进行全盆地范围的测试，需要准确和精确的放射性年龄，只有通过改进蚀变海底玄武岩的Ar 40/Ar 39定年才有可能。 通过重新测定现有样本的年龄，研究者将生成最先进的Ar 40/Ar 39年龄数据库。 该项目将对莱恩群岛30-100万年年龄范围内的37座海山和路易斯维尔海山的增量加热Ar 40/Ar 39测年进行重新定年，并测量Hf-Sr-Nd-Pb同位素和主要/微量元素丰度，以确定这些玄武岩的地幔来源和火山活动阶段。 这些数据将用于评估固定和移动热点模型。