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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
Abstract. 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.
Printed reference: Geoacoustic noises in the Kola Superdeep Borehole / Yu.G. Astrakhantsev, D.M. Guberman, B.P. Diakonov, S.L. Pevzner, A.K. Troyanov, Yu.N. Yakovlev // Vestnik of MSTU. 2007. V. 10, No 2. P. -.
Electronic reference: Geoacoustic noises in the Kola Superdeep Borehole / Yu.G. Astrakhantsev, D.M. Guberman, B.P. Diakonov, S.L. Pevzner, A.K. Troyanov, Yu.N. Yakovlev // Vestnik of MSTU. 2007. V. 10, No 2. P. -. URL: http://vestnik.mstu.edu.ru/v10_2_n27/articles/17_astrakh.pdf.
