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Date submitted1981-08-11
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Date accepted1981-10-10
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Date published1982-04-14
Seismic depth section of the crust of the Ladoga region and southwestern Karelia
In 1980 in the northwestern part of Ladoga and southwestern Karelia the production and geological association Sevzapgeologia and the Problem Research Laboratory of geological and geophysical studies of the Baltic Shield of the G.V.Plekhanov Leningrad Mining Institute conducted deep seismic studies by methods of deep seismic sounding and exchange waves from distant earthquakes (MOB3) along the profile and the Problem Research Laboratory of Geological and Geophysical Research of the Baltic Shield of the Leningrad Year Institute named after G.V. Plekhanov conducted depth seismic studies by methods of depth seismic sounding (DSS) and exchange waves from distant earthquakes (MOVZ) along the profile of Lahdenpokhya - Lake Segozero, which is hereinafter referred to as the Priladozhsky ...
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Date submitted1981-08-20
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Date accepted1981-10-18
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Date published1982-04-14
Calculation of the seismic model of the lower part of the Earth's crust and the crust-mantle transition zone from GSZ data on the Priladozhsky profile
- Authors:
- A. G. Goncharov
In 1980 on the Priladozhsky profile (Lahdenpokhya - Lake Segozero) the production-geological association Sevzapgeologia and Problem Research Laboratory of geological-geophysical research of the Baltic Shield of the G.V.Plekhanov Leningrad Mining Institute performed depth seismic sounding (DSS) ...
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Date submitted1981-08-07
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Date accepted1981-10-01
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Date published1982-04-14
Use of exchange refracted waves in the study of the Pechenga area
- Authors:
- T. L. Pisakina
- T. B. Gavlovskaya
Wave fields in the Pechenga area, recorded during observations by a complex of reflected wave methods (RWM) and vertical seismic profiling (VSP), are characterized by a large number of in-phase axes and a wide range of changes in apparent velocity ...
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Date submitted1981-08-06
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Date accepted1981-10-11
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Date published1982-04-14
Seismic studies by the transmission method on the Vuori-Järvi massif of alkaline-ultrabasic rocks
- Authors:
- M. D. Lizinsky
Seismic exploration in areas of crystalline rock development has proven to be an effective method of studying ore-controlling structures ...
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Date submitted1981-08-08
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Date accepted1981-10-19
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Date published1982-04-14
Pilot acoustic logging studies in the Pechenga ore field
- Authors:
- V. G. Terentyev
- V. P. Sinelnikov
During field work in 1979 for the first time in the Pechenga ore field was tested a small-size model of acoustic borehole device, made in the All-Union Research Institute of Geophysical Well Research (VNIIGIS) with the participation of Leningrad Mining Institute ...
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Date submitted1981-08-22
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Date accepted1981-10-04
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Date published1982-04-14
Algorithms of automated processing in solving the problem of classification of bottom sediments by acoustic methods
- Authors:
- A. I. Svechnikov
Division of bottom sediments by granulometric composition into boulder, pebble, sandy-gravel, sandy, clay and muddy, determination of belonging of the identified sediments to a certain lithologic type on the basis of the results of acoustic studies performed during the mapping of bottom sediments in the water area, is reduced to solving the problem of restoring the totality of properties of the object by its reaction to the external impact (acoustic radiation) ...
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Date submitted1981-08-25
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Date accepted1981-10-20
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Date published1982-04-14
Compilation of three-dimensional structural-plane models of the crust of the eastern part of the Baltic Shield
- Authors:
- E. A. Levenberg
At present, quite a lot of experience has been accumulated in building structural-density models on the basis of joint interpretation of seismic and gravity data ...
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Date submitted1981-08-30
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Date accepted1981-10-28
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Date published1982-04-14
Methodology of compiling velocity models of geologic rocks of ore districts
- Authors:
- Yu. G. Shopin
- O. V. Miroshnikova
The task of compiling velocity models of ore districts is extremely difficult due to the variety of forms of distribution of elastic parameters in magmatic rocks and an insufficiently developed set of methods of their study ...
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Date submitted1981-08-15
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Date accepted1981-10-18
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Date published1982-04-14
Tracing of steeply dipping reflecting boundaries in plateau basalts of northern Iceland
- Authors:
- Wijeratne Makevita
Iceland is an island of volcanic origin, and the visible part of the Earth's crust in Iceland is almost entirely composed of volcanic rocks. Over 90% of these are basalts, the remainder being andesites, dacites, rhyolnites and trachytes ...
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Date submitted1981-08-13
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Date accepted1981-10-07
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Date published1982-04-14
About taking into account the averaging interval when interpreting the difference magnetic anomalies of low thickness strata and simple anticlinal folds.
- Authors:
- V. P. Zakharov
To increase the reliability of geological interpretation of aeromagnetic survey materials, often with the help of various transformations try to isolate from the anomalous field component associated mainly with a certain depth interval of magnetic rocks ...
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Date submitted1981-08-21
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Date accepted1981-10-09
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Date published1982-04-14
Calculation of theoretical anomalies ∆T at approximation of weakly magnetic geological objects by oblique prisms and polyhedra of general form
- Authors:
- G. G. Kravtsov
Modern high-performance magnetometers and aeromagnetometers measure the absolute magnitude of the magnetic field vector. Their sensitivity is sufficient to detect anomalies ∆T , calculated in units of gamma ...
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Date submitted1981-08-06
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Date accepted1981-10-24
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Date published1982-04-14
Magnetic field of three-dimensional sources of arbitrary shape on a non-horizontal plane
- Authors:
- V. V. Glazunov
Deterministic methods of interpretation are developed, as a rule, on the basis of formulas valid for a horizontal surface. But a physical surface can be as complex as desired, and it can be approximated more often and with less error by an inclined plane rather than by a horizontal plane ...
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Date submitted1981-08-26
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Date accepted1981-10-03
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Date published1982-04-14
Computer interpretation of ∆T anomalies of brachianticline structures
- Authors:
- Yu. P. Goryachev
When studying the geological structure of the Baltic Shield, aeromagnetic survey has long been widely used to identify massifs of intrusive rocks, discontinuities, mapping of individual fold structures in the structure of which relatively strongly magnetic marking horizons take part ...
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Date submitted1981-08-23
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Date accepted1981-10-04
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Date published1982-04-14
Theory and practice of amplitude-phase measurements of harmonic magnetic field interference for the purpose of electrical prospecting
- Authors:
- V. Kh. Zakharov
Most methods and modifications of electrical exploration are based on the study of fields generated by special (own) sources. In this case, the fields of extraneous sources are a kind of interference, limiting to a greater or lesser extent the effectiveness of electrical exploration methods ...
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Date submitted1981-08-06
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Date accepted1981-10-08
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Date published1982-04-14
About geologic-historical aspect of geothermal studies
- Authors:
- G. A. Cheremensky
Reconstruction of geologic history is one of the tasks of geophysics, the possibility of solving which is conditioned by geophysical fields and properties of rocks ...
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Date submitted1981-08-22
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Date accepted1981-10-28
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Date published1982-04-14
Limit current density in "background-free" polarography
- Authors:
- O. F. Putikov
In laboratory methods of polarographic analysis, the fluid under study is mixed with an indifferent electrolyte of high concentration called a polarographic background ...
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Date submitted1981-08-28
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Date accepted1981-10-24
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Date published1982-04-14
Physical and geological characterization of ultrabasites of Eastern Cuba
- Authors:
- P. H. Rodriguez
Ultrabasitic rocks are widely developed in Eastern Cuba, with which large deposits of nickeleniferous laterites and chromites are spatially and genetically associated ...