Polarization of a High-Frequency Electromagnetic Field in the Tensor CSRMT Method

Izvestiya, Physics of the Solid Earth - Abstract—The paper considers different modes of producing a “rotating” field for the implementation of the tensor CSRMT method. We analyzed...     

Bottom Sediments of the Caspian Sea as an Indicator of Changes in Its Water Regime

Qualitative changes in the Caspian Sea water regime for the last 20–25 kyr are analyzed based on studying the particle-size distribution, the composition of clay minerals, the mineral composition of the coarse clastic fraction, and the magnetic susceptibility of deep-sea bottom sediments.     

Wave effects in the field of a high-frequency horizontal electric dipole

A normal electromagnetic field of the high-frequency horizontal electric dipole is analyzed with allowance for the displacement currents in the earth and air. The components of the field are calculated by the method of partial integration for nonsmooth behavior of the integrand. The boundary between the quasistationary and wave zone of the source is established according to the results of calculations. The effects arising in the wave zone due to the displacement currents in the air are considered. The results of the calculations are confirmed by field experiments.     

Material composition and geochemical characteristics of ores of the Malinovskoe gold-ore deposit (Primorskii Krai,Russia)

The mineral composition and geochemical characteristics of the ores of the Malinovskoe gold-ore deposit are studied by the data from mining works (ditches, cleanings, and boreholes). It is found that the ore–magma system of the deposit was formed in several stages of mineralization characterized by two phases of magmatism differing in age. In terms of the set of features (the geological–structural position of the deposit, as well as the material composition and geochemical characteristics of the ores), the deposit is attributed to the gold–tourmaline type of mineralization associated spatially and genetically with the “raremetal” granitoid magmatism. This type has not previously been found in Primorskii Krai. The studies of the material composition and geochemical characteristics of the ores allow us to ascertain the correlations between the elements along with the reasons of their origination. By analogy with other gold-ore formations of the Russian Far East, the mineralogical and geochemical model of the deposit is developed (Be–Sn–Cr–Ba–Au–Cu–Mo–Pb–V–Ti–Co–W–Ag–Bi–Ni–Mn–Sr–Zn–Sb–As modeling element series of vertical zoning), which enables us to estimate the levels of the erosion section of the ore bodies and to evaluate their prospects. It is found that the most productive associations in the deposit are the gold–bismuth geochemical association (Au–Ag–Bi–Cu–As–Co) and, to a lesser degree, the gold–tungsten association (W–Au–Ag–Cu–Bi–As).