Precise measurement of stable (δ 88/86Sr) and radiogenic (87Sr/86Sr) strontium isotope ratios in geological standard reference mate

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• 作者：JinLong Ma (1)
  GangJian Wei (1)
  Ying Liu (1)
  ZhongYuan Ren (1)
  YiGang Xu (1)
  YongHong Yang (2)
  
• 关键词：stable Sr isotopes ; δ 88/86Sr ; 87Sr/86Sr ; IAPSO ; geological standards ; MC ; ICP ; MS
• 刊名：Chinese Science Bulletin
• 出版年：2013
• 出版时间：September 2013
• 年：2013
• 卷：58
• 期：25
• 页码：3111-3118
• 全文大小：685KB
• 参考文献：1. Faure G. Isotopes Principles and Application. New Jersey: John Wiley & sons, Inc, 2005
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• 作者单位：JinLong Ma (1)
  GangJian Wei (1)
  Ying Liu (1)
  ZhongYuan Ren (1)
  YiGang Xu (1)
  YongHong Yang (2)
  
  1. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
  2. CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
  
• ISSN：1861-9541

文摘

A new method for high-precision measurements of stable (δ 88/86Sr) and radiogenic (87Sr/86Sr) Sr isotope ratios was developed on the MC-ICP-MS using a standard-sample-standard bracketing protocol. By carefully monitoring and controlling the accumulation of the on-peak backgrounds (i.e. the carryover memory) on the instrument, our method can provide an external precision of around ±0.010-to ±0.014-for δ 88/86Sr measurements. Such precision is comparable to that achieved by double-spike TIMS method (DS-TIMS), and 2- times better than those of the previously reported results by MC-ICP-MS without spiking. The results of the standard seawater IAPSO are also identical to those by DS-TIMS. However, our method is more advantageous, efficient and convenient to use for routine Sr isotopic analysis than the DS-TIMS method as there is no need to prepare and calibrate the 84Sr-87Sr double spike. Using this method, we measured the δ 88/86Sr values in a series of international geological rock standards, which show large variability, with the lowest value (±0.20- registered in JG-2, a terrestrial granite, and the highest value (0.539- in UB-N, a serpentinite. This may provide an additional means for isotopic characterization of geological processes, adding a new dimension over the traditional use of radiogenic Sr isotopic ratio 87Sr/86Sr.