GAMMA-ACTIVATION ANALYSIS OF NITROGEN SOLUBILITY IN ALUMOSILICATES ATHIGH-PRESSURE AND TEMPERATURE

A solubility of nitrogen in natural basalts and synthesized albite at 1250 degrees C and 3 kbar was studied by gamma-activation method based on the reaction N-14(gamma,n)N-13 with radiochemical separation of ni trogen by high-temperature extraction at 1800 degrees C. Detection lim it of 0.2 mu g in the samples of 15-20 mg weight is obtained. The inve stigation originated from the study of processes of accumulation and r edistribution of nitrogen in rock-forming alumosilicate melt of the Ea rth mantle. The dependence of nitrogen solubility on the oxygen volati lity and pressure were obtained (within 1-3 kbar in the presence of IW buffer [iron(Fe)-wustite(FeO)]) and NNO (Ni-NiO), and essential effec t of the composition of the initial matrix was found. Special attentio n was given to standards, background, interference reactions, reliabil ity and accuracy of the results.