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Vol. 10 (2007 year), No. 2

Astrakhantsev Yu.G., Guberman D.M., Diakonov B.P., Pevzner S.L., Troyanov A.K., Yakovlev Yu.N.
Geoacoustic noises in the Kola Superdeep Borehole

The intrusive body of rhyodacitic porphyry having a thickness about 110 m was fixed in the section of the Early Proterozoic Pechenga Complex of the Kola Superdeep Borehole (SG-3) in an interval of 4673.0-4831.6 m. Rhyodacites correspond to the hypersthene-normative calc-alkalic rocks with normal alkalinity oversaturated by Al2O3 and enriched by Fe and Mg. On a set of ore-minerals (oxides – magnetite, ilmenite, hematite, rutile; sulfides – chalcopyrite, pyrite, pyrrhotite, millerite, zygenite) rhyodacites are close to the host-volcanites of the Orshoaivi-Pirttijarvi Suite and host-sediments of the Luchlompolo Suite, but they differ by stability of chemical composition and by deficiency of isomorphic admixtures. They have a high natural radioactivity, which is caused by the increased contents of U and especially Th. U-Pb age of zircones from rhyodacites – 2043+/–18 Ma. Probably, their introduction preceded formation of the Ni-bearing gabbro-wehrlitic intrusives of the Pechenga Area.

(in Russian, стр.5, fig. 6, tables. 0, ref 6, Adobe PDF, Adobe PDF 0 Kb)

Vol. 10 (2007 year), No. 2

Guberman D.M., Badalov O.G., Pevzner S.L., Khmelinsky V.I., Yudin E.I., Yakovlev Yu.N.
Monitoring of geofields in the Kola Superdeep geolaboratory: History, experience, basic challenges and results

The results for investigation of geoacoustic noises distribution in a range of 100-5000 Hz along the Kola Superdeep Borehole (SG-3) have been discussed. A geological section cut by the borehole in the interval of 300-6840 m is shown to be dynamically active by parameters of three-component measurements of geoacoustic noises (GAN). When comparing the data obtained at a year intervals, we found a vertical migration of zones of the stressed state of rocks that is fixed by appearance of new GAN local anomalies or disappearance of those found earlier. From the analysis of the GAN amplitude-frequency spectra, gas emission from the rock massif has been observed, in particular, at the zones of tectonic dislocation of the geological environment.

(in Russian, стр.8, fig. 0, tables. 6, ref 6, Adobe PDF, Adobe PDF 0 Kb)

Vol. 10 (2007 year), No. 2

Schulze K.C., Kuempel H.-J., Guberman D.M., Morgachev V.I., Pevzner S.L., Pisarnitsky A.D., Simonova L.A., Smirnov Yu.P., Khmelinsky V.I., Yudin E.I., Yakovlev Yu.N.
Signatures of fluid level variations in the Kola Superdeep and two surrounding boreholes

Modern concepts of the deep structure of the earth crust based on the analysis and generalization of seismic data collected in the past 40 years and the Kola Superdeep Borehole record have been presented. The tomographic model of the Pechenga district has been characterized. Our knowledge of the layered pattern of the earth crust stratification has been updated, the geometry of seismic boundaries has been described more accurately and the crust-mantle boundary under the Pechenga structure has been found to be uplifted.

(in Russian, стр.8, fig. 6, tables. 0, ref 11, Adobe PDF, Adobe PDF 0 Kb)