187Re-187Os Calibration of Molybdenite from Henderson, Colorado: A New NIST Reference Material

科罗拉多州亨德森辉钼矿的 187Re-187Os 校准：一种新的 NIST 参考材料

• 批准号: 0111876
• 负责人: Holly Stein
• 金额: $ 10.99万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0111876&HistoricalAwards=false
• 关键词: 187Re; 187Os; Calibration; Molybdenite; Henderson

0111876SteinUse of the geochronometer based on the decay of rhenium (Re) to osmium (Os) is rapidly expanding, and there are no reference materials certified by the National Institute of Standards and Technology (NIST) for inter-laboratory comparison. Advances in chemical and mass spectrometric procedures permit high precision determination of Re and Os, even on low-ppt level samples. Molybdenite (MoS2) is uniquely suited for the Re-Os chronometer because it commonly contains high concentrations of the parent Re and essentially no initial daughter Os. Thus, the decay of 187Re to 187Os yields precise ages, even in very young samples, without correction for initial Os. With increasing demand for Re-Os dating, particularly of molybdenite, the need for an accepted reference material for inter-laboratory comparison has become crucial. We propose to calibrate a Re-Os molybdenite reference material, working together with University of Alberta and NIST. The proposed Re-Os reference molybdenite is from Henderson, Colorado, the location of a well-studied molybdenum deposit. NIST will physically mix, split, and bottle the Henderson molybdenite powder. Statistically representative sets of samples will be analyzed by the AIRIE Lab at Colorado State University and by the isotope lab at the University of Alberta. The distribution of the reference material will be fully handled by NIST, and the cost for the molybdenite reference material will reflect only the costs incurred by NIST for their part of the work. ***

0111876基于rhenium（Re）对osmium（OS）的衰变（OS）的地球体学计的史图纳（Osmium（OS））正在迅速扩大，并且没有国家标准技术研究所（NIST）认证的参考材料（NIST）进行实验室间比较。 化学和质谱程序的进展允许对RE和OS的高精度确定，即使是在低PPT级别样本上。 钼酸盐（MOS2）非常适合RE-OS计时仪表，因为它通常包含高浓度的母体RE，并且本质上没有初始的女儿OS。 因此，即使在非常年轻的样本中，187RE到187OS的衰减也会产生精确的年龄，而初始OS也没有校正。 随着对重新约会的需求不断增长，尤其是对钼酸钼矿的需求，对实验室间比较的公认参考材料的需求已变得至关重要。 我们建议校准与艾伯塔大学和NIST合作的Re-OS钼参考材料。 拟议的Re-OS参考钼酸属岩来自科罗拉多州的亨德森（Henderson），是拟建的钼沉积物的位置。 NIST会在物理上混合，分裂和瓶装Henderson molybdenite粉末。 统计代表性的样本集将由科罗拉多州立大学的Airie实验室和艾伯塔大学的同位素实验室进行分析。 参考材料的分布将由NIST充分处理，钼酸群参考材料的成本仅反映NIST为其工作而产生的成本。 ***