Modified procedure of reconstruction of helium concentrations in deep groundwaters

A modification of the technique for reconstructing concentrations of radiogenic helium in deep underground waters using quartz extracted from the drilled borehole core was developed and tested. In order to isolate the component of sample internal volume, stable at the temperature of the experiments, it was proposed to subject the samples to short-term preheating, at which inclusions opening at low temperatures should break down. The PHe values in the samples reconstructed in the course of the development of the samples indicate plausibility and good reproducibility of the results. The samples of quartz from the Kola Superdeep Borehole were also used to test the preliminary sorting of samples by recording the helium yield curves during linear heating of the sample. It is shown that in this way it is possible to choose potentially suitable samples, to diagnose the presence of gas-liquid decrepitating inclusions and helium sites that are not related to the crystal structure of quartz. Methodological considerations about planning such a research and methods of verification of the results are outlined.