Ultra-low procedural blank and the single-grain mien Rb-Sr isochron dating

作者：Li QL^*; Chen FK; Wang XL; Li XH; Li CF

来源：Chinese Science Bulletin, 2005, 50(24): 2861-2865.

DOI：10.1360/982005-984

• ultra-low procedural blank
• single grain
• mica Rb-Sr dating
• kimberlite

Both low procedural blank and high-precision measurements of isotopic ratios are crucial for the analysis of micro samples. This study reports a chemical procedure of ultra-low blank for the high precision measurement of Sr isotopic ratios on micro samples (< 1 ng level) using a new-type thermal ionization mass spectrometer IsoProbe-T, with a case study of single-grain Rb-Sr isochron dating on phlogopite from the Fuxian kimberlite in Liaoning Province. This method can be employed in studies of high resolution Rb-Sr geochronology and Sr isotopic geochemistry and thus will broaden application of the Rb-Sr isotopic system to earth sciences.

• 出版日期2005-12
• 单位中国科学院大学; 中国科学院地质与地球物理研究所兰州油气资源研究中心; 中国科学院地质与地球物理研究所