Osmium concentrations and 187Os/188Os ratios of GSJ reference samples, JB-1a, JA-2 and JP-1
Osmium concentrations and 187Os/188Os ratios of GSJ reference samples, JB-1a, JA-2 and JP-1
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GSJ 参考样品、JB-1a、JA-2 和 JP-1 的锇浓度和 187Os/188Os 比率
DOI：
10.2343/geochemj.35.207
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发表时间：
2001
影响因子：
0.8
通讯作者：
Y. Tatsumi
中科院分区：
文献类型：
--
作者：
Katsuhiko Suzuki;Y. Tatsumi
用同位素稀释-负热电离质谱仪(ID-NTI-MS)测定了JB-1a、JA-2和JP-1三种岩石的Os、Re丰度和187Os/188Os比值。对每个样品的重复分析表明，Re和Os在参考岩石中的分布不均匀。JB-1a的Re和Os浓度范围分别为150-200 ppt和9-12 ppt，JA-2为59-67 ppt和10-12 ppt，JP-1为28-32 ppt和2400-2700 ppt。JB-1a和JA-2的~(187)Os/~(188)Os比值极高(0.20~0.28)，远高于球粒体地幔(0.12~0.13)，表明有俯冲板片物质等具有高放射性成因的成分参与。参考岩石JP-1为霍罗曼橄榄岩，其次球粒陨石Os同位素组成为0.12。
Osmium and Reabundance and 187Os/188Os ratios of reference rocks, JB-1a, JA-2 and JP-1, were determined through isotope dilution—negative thermal ionization mass spectrometry (ID-NTI-MS). Duplicate analyses of each sample show heterogeneous distribution of Re and Os in the reference rocks. The ranges of Re and Os concentrations are 150–200 and 9–12 ppt for JB-1a, 59–67 and 10–12 ppt for JA-2 and 28–32 and 2400–2700 ppt for JP-1, respectively. Extremely high 187Os/188Os ratios of 0.20–0.28, much higher than that of the chondritic mantle (0.12–0.13), of JB-1a and JA-2 indicates involvement of components with highly radiogenic 187Os/188Os ratios such as the subducting slab-derived materials. The reference rocks JP-1, Horoman peridotite, yields sub-chondritic Os isotopic composition of 0.12.