A Calibration Strategy of 87Sr/86Sr Ratio for Rocks with High Rb/Sr Measured by Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry
详细信息
- 责任者：Dai Mengning (State Key Laboratory of Continental Dynamics ; Department of Geology ; Northwest University ; Xi’an 710069 ; China) ; Zong Chunlei
- 刊名：Rock and Mineral Analysis
- 出版年：2012
- 卷期：31(1)
- 关键词：ICP—MS ; inductively coupled plasma mass spectroscopy ; 锶 ; strontium
- 页码：p.95-102
- 图表：3 illus., 3 tables, 16 refs.
- 分类号：0900
- issnNo：ISSN0254-5357
- isbnNo：CN11-2131/TD
摘要
Based on theoretical analysis, a calibration method is reported, including an isotope fractionation calibration. The method yields an accurate 87Sr/86Sr ratio for geology samples with Rb/Sr<0.2 after chemical separation, and reduces requirements of chemical separation for isotope measurements by MC-ICPMS. However, the measurement accuracy for geological samples with Rb/Sr>0.2 after chemical separation was significantly lower due to mass fractionation and memory effect, which cannot be calibrated to obtain an accurate Sr isotopic composition by any kind of calibration method.