Nuclear reaction analysis of hydrogen in almandine, pyrope, and spessartite garnets

G. R. Rossman
Division of Geological and Planetary Sciences
California Institute of Technology, Pasadena, CA 91125

F. Rauch
Institut für Kernphysik, Universitȁt Frankfurt
Frankfurt am Main, W. Germany

R. Livi
Instituto de Fisica-UFRGS
90000-Porto Alegre-RS, Brazil

T.A. Tombrello
  DIvision of Physics, Mathematics and Astronomy
California Institute of Technology, Paadena, CA 91125

C.R. Shi
Nuclear Research Institute
Lanzhou University, Lanzhou, PRC

Z.Y.  Zhou
Nuclear Science Department
Fundan University, Shanghai, PRC


The hydrogen concents of a series of almandine, pyrope, and spessartite garnets were determined with the 15nuclear profiling method. The H contents, ex­pressed as H2O, ranged up to 0.12 wt.% for one spessartite, but were normally in the 0.0x wt.% range. When the measured H contents were compared with infrared absorbance data, different calibration trends were obtained with the spessartine and almandine data. The pyrope garnets contain so little H (<0.02 wt.% H2O) that satis­factory calibrations have not yet been obtained with the nuclear method.