Abstract
The tracing of current-conducting channels of the Pechenga structure from Russian to Norwegian territory was the main task of this research. The study was carried out in the framework of the Soviet-Norwegian cooperation “Northern Region” to estimate the prospects for discovery of Cu-Ni deposits in northern Norway. In addition to previous publications of technical character, the emphasis here is on geological description. Experimental measurements have been performed in the field of the “Khibiny” dipole and with the use of DC electrical profiling. The “Khibiny” dipole consists of 160-ton aluminum cable flooded in the Barents Sea bays on opposite sides of the Sredny and Rybachy peninsulas. Measurements were implemented as in the mode of single pulses generated by 80 MW magneto-hydrodynamic (MHD) generator “Khibiny” (“hot” launches) and in the accumulation mode of rectangular current pulses of 0.125 Hz frequency generated by a 29 kW car generator (“cold” launches). From results of measurements, it was concluded that the most promising potential for Cu-Ni deposits Pil’gujarvi formation of the Northern wing of the Pechenga structure is rather quickly wedged out in Norway, while the conductive horizons of the Southern part of Pechenga, which have a weak prospect for Cu-Ni ores, follow into Norway nearly without a loss of power and integral electrical conductivity.
Highlights
In the early 1970s, a new scientific direction appeared in Russia—the deep electromagnetic soundings on the base of a unique technology—impulsive magnetohydrodynamic (MHD) generators with a power of tens and up to one hundred MegaWatts
For a relatively short time, several MHD experiments were performed for the purposes of earthquake prediction, to study the structure of the Earth’s crust and to predict ore deposits, to search for oil and gas deposits (Vanavaar test site in Siberia and the Astrakhan test site in the Southern Volga region) and to solve some problems of extra low-frequency (ELF) radio communications [3,4]
Compared to results of method of internal sliding contact (MISC) electrical profiling, this study suggests that near the profile Pas-1 the thickness of the results of MISC electrical profiling, this study suggests that near the profile Pas-1 the thickness of the conductive body equated to the productive suite decreases to 20–30 m
Summary
In the early 1970s, a new scientific direction appeared in Russia (former Soviet Union)—the deep electromagnetic soundings on the base of a unique technology—impulsive magnetohydrodynamic (MHD) generators with a power of tens and up to one hundred MegaWatts. The study of ore prospective, high conductive structures (current conductive channels) in the Kola Peninsula and in the neighboring countries (Northern Norway and Finland) has been accepted as one promising task of the Khibiny experiment. Pil’gujarvi formation (the fourth sedimentary layer of the Northern Pechenga) contains many Cu-Ni deposits (Kaula, Kammikivi, Semiletka, Zhdanovka, etc.), which are linked to differentiated massifs of basic-ultrabasic rocks This suite has been called the Productive stratum [8]. In the Southern series of the Pechenga structure with its major Kallojavr-Porjitash, Bragino and Langvannet-Porojarvi formations, on the contrary, differentiated massifs of basic-ultrabasic rocks are nearly absent. Their potentials for Cu-Ni ores are fairly low. The final part is devoted to a discussion and summary
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