GEOPHYSICAL RESEARCH, 2016, vol.17, no.2, pp.19-31. DOI: 10.21455/gr2016.2-2

Abstract  References  Full text (in Russian)  Full text (in English)


V.A. Minaev, V.A. Petrov, V.V. Poluektov

Institute of Ore Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russia

Abstract. The results of petrophysical studies of the host granitoids samples from deep levels of the molybdenum-uranium Antei deposit, the Streltsovskoe ore field (SE Transbaikal), are considered. With the increase in depth, the samples observed demonstrated the decrease in velocity of ultrasonic waves and the reduction of values of the Poisson's ratio and elastic moduli, that suggests a sharp decline in the ability of rocks to resist mechanical stress and increase in their fragility and fracture porosity. The degree of disturbance of the crystalline matrix also increases with the depth. The higher values of flow parameters imply conditions that are favorable to the circulation of ore-bearing solutions and ore localization. Accordingly, an increase in quantity and thickness of ore bodies with the depth can be expected. However, the real situation in the deposit is totally different. Both the quantity and the thickness of ore bodies decrease with the depth. Preliminary calculations of the modern normal stresses indicate the change in tectonic regime from tension to compression at deep (>750 m) horizons of the deposit. Thus the instrumental studies of the stress-strain state of the Antei deposit should be conducted and the project on the directional drilling for detection of hidden ore bodies should be developed.

Keywords: granitoids, main normal stresses, uranium deposit, petrophysical parameters, tectonic regime, ultrasound.



Ask D., Stephansson O., and Cornet F. International Progress Report IPR-01-26. Äspö Hard Rock Laboratory. Integrated stress analysis of hydraulic stress data in the Äspö region, Sweden. Analys of hydraulic fracturing stress measurements and hydraulic test in pre-existing fractures (HTPF) in boreholes KAS02, KAS03 and KLX02. SKB, 2001, pp. 98-100.

Ask D. Evaluation of measurement-related uncertainties in the analysis of overcoring rock stress data from Äspö HRL, Sweden: a case study, Int. J. Rock Mech. Min. Sci., 2003, no. 40, pp. 1173–1187.

Burmistrov A.A., Starostin V.I., Dergachov A.L., and Petrov V.A. Strukturno-petrofizicheskiy analiz mestorozhdeniy poleznih iskopaemih (Structural and petrophysical analysis of mineral deposits). Moscow: MAKS Press, 2009 (in Russ).

Fuchs K. and Müller B. World stress map of the Earth: a key to tectonic processes and technological applications, Naturwissenschaften, 2001, no 88, pp. 357–371.

Hudson J.A., Cornet F.H., and Christiansson R. ISRM suggested methods for rock stress estimation – Part 1: Strategy for rock stress estimation, Int. J. Rock Mech. Min. Sci., 2003, no 40, pp. 991-998.

Jaeger J.C. and Cook N.G.W. Fundamentals of rock mechanics. Chapman-Hall. 1979.

Kozyrev A.A., Semenova I.E., and Avetisyan I.M. Development of numerical geomechanical model of Antey deposit as a base of rock mass stress-strain state forecasting. Mining information and analytical bulletin (scientific and technical journal), 2014, no. 4, pp. 33-40 (in Russ).  

Laverov N.P., Petrov V.A., Poluektov V.V., Nasimov R.M., Hammer J., Burmistrov A.A., and Shchukin S.I. The Antei uranium deposit: A natural analogue of an SNF repository and an underground geodynamic laboratory in granite, Geology of Ore Deposits, 2008, vol. 50, no. 5. pp. 339-361.

Minaev V.A., Petrov V.A., Polouektov V.V., and Nasimov R.M. The elastic parameters of the host rocks Antei deposit and the terms of their relationship with ore location, In Chetirnadcataya Mezhdunarodnaya Konferenciya «Phisiko – himicheskie i petrofizicheskie issledovaniya v naukah o Zemle» (Fourteenth International Conference "Physical and chemical and petrophysical studies in earth sciences), Moscow: Vernadsky Institute, IPE RAS, IGEM, IEM RAS, 2013. pp. 186-189 (in Russ).

Modelirovanie poley napryazheniy v inzhenerno-geologicheskih massivah (Modelling of stress fields in geotechnical arrays), ed. E.V. Kalinin, Moscow: Izd. University Press, 2003 (in Russ).

Petrov V.A., Polouektov V.V., Nasimov R.M., Shchukin S.I., and Hammer J. Natural and technogenic changes in the mode of rock deformation in the uranium deposit in granites, Izv. Phys. Solid Earth, 2009, vol. 45, no. 11. pp. 1012-1018.

Petrov V.A. and Nasimov R.M. Sposob opredeleniya neodnorodnostey uprugikh I filtratsionnokh svoystv gornih porod (A method of determining the elastic and filtration properties of rocks). The patent for the invention № 2515332 from 13.03.2014.

Petrov V.A., Rebetsky Yu.L., Poluektov V.V., and Burmistrov A.A. Tectonophysics of Hydrothermal Ore Formation on the Example of the Antei Mo–U Deposit, Transbaikalia, Geology of Ore Deposits, 2015, vol. 57, no. 4, pp. 292-312

Rasskazov I.Yu., Saksin B.G., Petrov V.A., and Prosekin B.A. Geomechanics and seismicity of the antey deposit rock mass, Journal of Mining Science, 2012, vol. 48, no. 3, pp. 405-412.

Rasskazov I.Yu., Saksin B.G., Usikov V.I., Petrov V.A., Shevchenko B.F., and Gil'manova G.Z. Present-day stress-strain state in the upper crust of the Amurian lithosphere plate, Izv. Phys. Solid Earth, 2014, vol. 50, no. 3, pp. 444-452.

Reinecker J., Heidbach O., Tingay M. et al. The 2005 release of the World Stress Map (

Shkuratnik V.L. and Nikolenko P.V. Metodi opredeleniya napryazhenno-deformorovannogo sostoyaniya massiva gornih porod (Methods for determination of stress-strain state of the rock mass). Moscow: Moscow State Mining University, 2012, pp. 15 (in Russ).

Shchukin S.I, Petrov V.A., Polouektov V.V., and Ustinov S.A. Geologicheskaya bza dannih dlya modelirovaniya i prognoza deformaciy massiva porod mestorozhdeniya Antey Streltsovskogo rudnogo polya (Geological data base for modeling and prediction of deformation of rock mass of the Antei deposit of the Streltsovskoe ore field), Mining Journal, 2015, no. 2, pp. 21-26

Yamshchikov V.S. Metodi I sredstva issledovaniya i kontrolya gornih porod I processov (Methods and tools for the study and control of rocks and processes), Moscow: Nedra, 1982 (in Russ).

Zoback M.L. First- and second-order patterns of stress in the lithosphere: the world stress map project, J. Geophys. Res., 1992, no. 97, pp. 11703–11728.