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

作　　者：LI Qiuli HEN Fukun WANG Xiuli LI Xianghui LI Chaofeng 

机构地区：[1]State Key Laboratory of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China [2]School of Earch Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100039, China

出　　处：《Chinese Science Bulletin》2005年第24期2861-2865,共5页

基　　金：supported by the National N atural Science Foundation of China(Grant Nos.40403008 and 40372106);the China Postdoctoral Science Foundation.

摘　　要：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.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.

关 键 词：地球科学 同位素比 稳定同位素地球化学 云母 角砾云橄岩 Rb-Sr同位素测年 

分 类 号：P578.959[天文地球—矿物学] P597.2[天文地球—地质学]