GEOELECTRIC SECTION OF THE LITHOSPHERE OF THE KHANKA MASSIF ALONG THE POZHARSKOYE VILLAGE–SHKOTOVO SETTLEMENT PROFILE FROM MT SOUNDINGS

The geoelectric section of the lithosphere is constructed down to a depth of 150 km based on the results of MT soundings carried out along the profile crossing the Khanka Massif from north to south. The crust and upper mantle structure of the massif is investigated. It has been found that the Khanka Massif is divided into the northern and southern parts bordered by the northern restriction of the Spassk Zone. A higher resistivity observed in the upper part of the section and the upper mantle is typical of the southern part of the massif. The northern part is characterized by two extended low-resistivity areas located beneath the southern boundaries of the Matveevka and Nakhimovka zones that penetrate from the upper mantle up to the surface. A comparison of the results obtained with the seismic prospecting and gravimetric data has shown their direct or indirect consistency.

Magmatic control of gold mineralization in Western Primorye (by geophisical data)

An analysis of the regional gravitational field of the north-east of China, Korea and Western Primorye was carried out. The distribution of gold deposits was compared with the development of Mesozoic magmatism and negative anomalies of the gravitational field. Based on the analysis of geological, mineragenic, petrophysical and geophysical materials, geological and geophysical zoning of the western part of the Khanka massif was performed, and a scheme for interpreting geological and geophysical data with elements of minerageny was drawn up. A connection was established between the anomalies of the magnetic and gravitational fields and the position of the supposed gold-bearing ore regions and nodes located in the zone of joints of the North China Triassic-Jurassic volcanic-plutonic belt with the Proterozoic substrates of the Khanka massif. According to geophysical data, Early Jurassic intrusions were identified as, controlling the location of the gold nodes. It was concluded that the gold mineralization is related to the Jurassic magmatism, which increases the prospects for the discovery of gold mineralization in the Khanka district of the Western Primorye.