The method of geophysical exploration in the search for placer deposits in the waters in the areas of 'living' faults and in the wave-breaking zone

摘要

FIELD: physics.SUBSTANCE: studying the map of the anomalous magnetic field of the Earth in the investigated area, obtained from the results of the previously performed high-precision magnetic survey in a prospective for the discovery of placers of minerals in the water area. In the area of the "living" ripe, a seismoacoustic monitoring station is set up to record micro-earthquakes and a daily change in acoustic emission. Determining the periods of activation and calm of the fault zone, as well as the period of activity of the wave zone. During the lull (after the activation period), a repeated high-precision magnetic survey is performed on the profile that suppresses the magnetic field anomalies on the old map, or they perform a repeated survey on the whole explored perspective area. Calculate the differences in the magnetic field (between old and repeated surveys) obtained before and after activation, allocate local anomalies on them. By the magnitude of the difference anomalies, it is judged about the presence of placers containing magnetic minerals. Samples are taken at the center of each anomaly and analyzed for the presence of a useful component. On the contours of significant anomalies in which, based on the results of the analysis of samples, the presence of anomalous contents of useful components is confirmed, the boundaries of the deposit are determined.EFFECT: reduction of sampling volumes, reduction of field work time.