Gamma-activation analysis of nitrogen solubility in alumosilicates at high pressure and temperature

A solubility of nitrogen in natural basalts and synthesized albite at 1250 deg C and 3 kbar was studied by γ-activation method based on the reaction 14N(γ,n)13N with radiochemical separation of nitrogen by high-temperature extraction at 1800 deg C. Detection limit of 0.2μg in the samples of 15-20 mg weight is obtained. The investigation originated from the study of processes of accumulation and redistribution of nitrogen in rock-forming alumosilicates melt of the Earth mantle. The dependence of nitrogen solubility on the oxygen volatility and pressure were obtained (within 1-3 kbar in the presence of IW buffer [iron(Fe)-wustite(FeO)[) and NNO (Ni-NiO), and essential effect of the composition of the initial matrix was found. Special attention was given to standards, background, interference reactions, relability and accuracy of the results. (author)