Isotope Analysis Including Age Determination of Minerals and Rocks by Mass Spectrometry

5 Isotope Analysis Including Age Determination of Minerals and Rocks by Mass Spectrometry 

2ct) and BCR-2G (87Li 4.08 1.0%c, 2cr) as suitable standards that cover a wide range of Li isotope compositions.65 Lithium isotope analysis of the silica rich NIST 600 glass series, measured by MC-ICP-MS and MC-TIMS, agrees with a precision of 0.8 %o (RSD). 

Geochronology for age dating of minerals is a major field in earth sciences, includes measurements of isotope ratios and requires advanced sensitive, precise and accurate mass spectrometric techniques. The determination of the age of the Earth has been of significant interest for hundreds 

The decay of radioisotope 238U to stable 206Pb in a closed system is described by the following equation  

The decay of radionuclide 232Th (t1/2 1.41 x 1010a) via the thorium decay line results in the emission of six alpha and four beta particles leading to the formation of the stable and most abundant lead isotope 208Pb  

The zircon reference material 91500 discussed before seems to be very suitable for calibrating in situ oxygen isotope analysis. For example, SIMS was employed to study the 8 0 value on the zircon single crystal 91500 . No systematic differences in SIMS 8 0 data were observed between individual fragments of zircon crystal. Peck et alP studied oxygen isotope ratios by ion microprobe analysis for evidence of oxygen isotope variation in continental crust and oceans in 3.3 to 4.4 X 10 year old zircons. In addition, the authors also analyzed rare earth elements (REEs).  

The physical methods of geochronology are based on the radioactive decay of unstable (parent) radionuclides into stable (daughter) isotopes such as Rb to Sr to ° Pb Th to 208pb 235pj jQ 207p(j. Rc to Os Lu to Hf and to °Ar. There are 

Age dating using the U, Th-Pb methods is based on the radioactive decay of and 

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