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

合作研究：利用莱恩群岛火山活动的高分辨率 40Ar/39Ar 测年重新评估太平洋盆地的热点模型

• 批准号: 0351412
• 负责人: Robert Duncan
• 金额: $ 6.25万
• 依托单位: Oregon State University
• 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=0351412&HistoricalAwards=false
• 关键词: Collaborative; Research; Re; Assessing; Hotspot

To 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测试，需要准确和精确的辐射年龄，直到现在，通过对蚀变海底玄武岩的 Ar40/Ar39 测年技术的改进，这才成为可能。 通过重新确定现有样本的日期，研究人员将生成最先进的 Ar40/Ar39 年龄数据库。 该项目将重新测定莱恩群岛 30-100 MA 年龄范围内的 37 个海山和路易斯维尔海山增量加热 Ar40/Ar39 测年，并测量 Hf-Sr-Nd-Pb 同位素和主量/微量元素丰度根据地幔来源和火山活动阶段来描述这些玄武岩的特征。 这些数据将用于评估固定和移动热点模型。