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The paper presents the results of a long-term (52 months) monitoring of molecular hydrogen release from the rocks of the Lovozero Massif. Observations are performed in an underground mine with the help of a portable highly sensitive gas analyzer developed at the National Research Nuclear University MEPhI. The strong variability (of 0.7 to 303 ppm) of the dynamics of the volume concentration of hydrogen (φH2) is established. The main elements of the structure of the time series obtained consist of the fact that they have quite sustained and long intervals of low background concentrations, low-amplitude excesses of various durations, and short (usually high-amplitude) bursts. Seasonal and off-season periodic and other cyclic components in the structure of the series are identified. It is shown that the most important factors determining the dynamics of φH2 are barogenic (variation in the atmospheric pressure) and technogenic (technological explosions). Possible mechanisms of gas release are considered. [ABSTRACT FROM AUTHOR]

Long-term monitoring yielded significant variations in the hydrogen volume concentration in an underground mine at the developed Lovozero rare-metal deposit of the nepheline-syenite massif in the Kola Peninsula. The deposit is characterized by emission of natural combustible gases. Basic structural elements of the time series obtained include relatively stable and long ranges of low background concentrations, low- and medium-amplitude rises of various duration, and short-term, commonly high-amplitude peaks. The range structure is characterized by a general decreasing trend, a low intensity random noise component, and seasonal and off-seasonal periodic and other cyclical components. Periodic circadian and semidiurnal harmonics are the most pronounced. [ABSTRACT FROM AUTHOR]