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

机译:超低程序空白和单粒云母Rb-Sr等时测年

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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.
机译:低程序空白和高精度同位素比测量对于微量样品的分析都是至关重要的。这项研究报告了一种使用新型热电离质谱仪IsoProbe-T的超低空白化学程序,用于高精度测量微量样品(<1 ng级)上的Sr同位素比,并以单粒为例Rb-Sr等时线测年辽宁省抚仙金伯岩的金云母上。该方法可用于高分辨率Rb-Sr同位素年代学和Sr同位素地球化学的研究,从而将Rb-Sr同位素系统应用于地球科学。

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