A MASS SPECTROMETRIC STUDY OF K39/K41 ABUNDANCE VARIATIONS BY DUAL COLLECTION AND DIGITAL MEASUREMENT TECHNIQUE

P K BHATTACHARJEE, V S VENKATASUBRAMANIAN

Abstract


The  status  of  K39/K41  abundance  ratios  in  rocks  and minerals  is  reviewed and  ,he  errors  and  corrections  required  in  such  measurements  pointed  out.  A  double-collector  mass  spectrometer  with  digital  recording  has  been  used for  K30/K41  measurements  in  a  number  of  granites,  charnockites  and  zeolites. While  the  granites do  not  reveal fractionation  effect,  K39 deficiency has  been  observed  in  charnockites and  zeolites.  Possible  reasons for  such  a  fractionation are  pointed  out


Keywords


K-isotopes; isotope geology.

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