An integrated study of the electrical parameters of the samples of magnetite ores in relation to their genesis and mineral composition (on the example of the Goroblagodatskoe skarn-magnetite deposit)

The temperature dependences of electrical resistance (at DC and AC voltage at 1 kHz frequency) of the samples of the magnetite ore and magnetite from the contact of the syenite-porphyry with the volcanic-sedimentary rocks from the Goroblagodatskoye iron-ore deposit in the temperature range 20—800 °C have been studied. The frequency dependences of the active electrical resistance and dielectric losses in the range 0,01—100 kHz have been obtained at 20 °C. For the magnetite ore and magnetite from the syenite-porphyry contact with volcanogenic sedimentary rocks in the studied temperature and frequency ranges, the relationship between electrical resistance (lgR) and dielectric losses (lgtgδ) has been revealed. The character of the relations is different, that allows to separate uniquely the magnetite ore and magnetite. The parameters of high-temperature conductivity (activation energy E_o and electrical resistance coefficient lgR_o)nave been obtained. The parameters of the studied samples of pyroxene-orthoclase-magnetite, garnet-magnetite, epidote-chlorite-magnetite ores form a straight line, as if forming its different parts. The correlation between the parameters of E₀ and lgR_o, samples of these ores has the following form: lgR_o, — 2,2—6,6 E_o. The parameters of magnetite samples from the contact of syenite porphyry with volcanogenic-sedimentary rocks also form a straight line, as if forming its different parts, with the correlation form as following: lgR_o — 2,1—6,6 E₀ . It has been found that with the increasing distance to the syenite intrusion, the electrical parameters of magnetite ore change: EQ increases, lgR_o, decreases. For magnetite from the contact of the syenite-porphyry and volcanic-sedimentary rocks there is another picture — the further you are from the syenite-porphyries, the smaller E₀ is, and the bigger the lgR_o, is. The T₀ temperatures, at which the electrical resistance at the constant voltage becomes equal to the active resistance at the alternating voltage for the samples of garnet-magnetite ore with the different magnetite content, P,%, have been revealed. The correlation between the T0 parameter and the magnetite content in the ore, P(Fe₃0₄ , %) = 323,4 — 47,4 ln( T₀ ), R₂ = = 0,93, has been established.

1. Baklaev Ya.P., Bocharnikova T.D. Zavisimosf izmenenija sostava i nekotoryh svojstv magnetita ot uslovij ih obrazovanija [Dependence of changes in the composition and some properties of magnetite on the conditions of their formation]. Skarnovo-magnetitovye mestorozhdenija Urala — [Skarn-magnetite deposits of the Urals]. Ed.: G.B. Fershtater, Ya.P. Baklaev. Sverdlovsk: Ural scientific center, USSR Academy of Sciences Publ., 1978, pp. 82-92 (In Russian)

2. Bakhterev V.V. Vysokotemperaturnaja jelektroprovodnost' magnetitovoj rudy (magnetita) v svjazi s geneticheskimi osobennostjami mestorozhdenija [High-temperature electric conductivity of magnetite ore (magnetite) in connection with genetic properties of the deposit]. Doklady RAN — [Doklady Earth Sciences], 2010, Vol. 433, no. 4, pp. 496-498 (In Russian).

3. Bakhterev V.V. Jelektroprovodnost' pri vysokih temperaturah obrazcov magnetitovyh rud — vozmozhnyj indikator ih mineral'nogo sostava i geneticheskih osobennostej mestorozhdenija [The high-temperature conductivity of magnetite ore as the possible basis for predicting the mineral composition and the genetic peculiarities of the deposits]. Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka — [Proceedings of higher educational establishments. Geology and Exploration], 2012, no. 5, pp. 40-45 (In Russian).

4. Bakhterev V.V., Kuznetsov A.Zh. Vysokotemperaturnaja jelektroprovodnost' magnetitovyh rud v svjazi s ih genezisom i mineral'nym sostavom [High-temperature conductivity of magnetite ores in relation to their genesis and mineral composition (by the example of the Goroblagodatskoe skarn-magnetite deposit)]. Geologija i geoflzika — [Russian Geology and Geophysics], 2012, Vol. 53, no. 2, pp. 270—276.

5. Bogoroditsky N.P., Volokobinskii Yu.M., Vorob'ev A.A., Tareev B.M. Teorija dijelektrikov — [Theory of dielectrics], Moscow-Leningrad, Energy Publ., 1965, 344 p. (In Russian).

6. Zhelezorudnaja baza Rossii — [Iron ore base of Russia], Editor M.I. Orlov, M.I. Verihin, N.I. Golivkin, Moscow, Geoinformmark [Geoinformmark Publ.], 1998, 842 p. (In Russian).

7. Zheludev I.S. Fizika kristallicheskih dijelektrikov — [Physics of crystal dielectrics], Moscow, Nauka Publ., 1968, 463 p. (In Russian).

8. Karasik M.A. Promyshlennye tipy kontaktovo-metasomaticheskih mestorozhdenij v Tagilo-Kushvinskom rajone i osobennosti raspredelenija jelementov-primesej v rudah jetih mestorozhdenij [Industrial types of contact-metasomatic deposits in Tagil- Kushvinsky district and peculiarities of distribution of impurity elements in ores of these deposits]. Zhelezorudnaja baza Tagilo-Kushvinskogo promyshlennogo rajona — [Iron ore base of Tagil-Kushvinsky industrial district], Sverdlovsk, Ural branch of the USSR Academy of Sciences Publ., 1957, pp. 64-98 (In Russian).

9. Kuznetsov A.Zh. Raspredelenie jelementov-primesej v magnetitah Goroblagodatskogo zhelezorudnogo mestorozhdenija [Distribution of impurity elements in magnetites of Goroblagodatsky iron ore Deposit]. Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka — [Proceedings of higher educational establishments. Geology and Exploration], 2003, no. 5, pp. 21—24. (In Russian).

10. Kuznetsov A.Zh. Vlijanie mikrosienitov i sienit-porfirov na porody i rudy Goroblagodatskogo zhelezorudnogo mestorozhdenija (Ural) [Influence microsyenite and syenite-porphyries in the rocks and ores Goroblagodatskoye iron ore Deposit (Ural)]. Metallogenija drevnih i sovremennyh okeanov — 2004. Dostizhenija na rubezhe vekov. T. 1. Problemy metallogenicheskogo analiza mestorozhdenij chernyh i cvetnyh metallov. Materialy desjatoj nauchnoj studencheskoj shkoly — [Metallogeny of ancient and modern oceans-2004. Achievements at the turn of the century. Vol. 1. Problems of metallogenic analysis of ore deposits of ferrous and non-ferrous metals. Materials of the tenth scientific student school], Miass, IMin. Ural branch of the RAS Publ., 2004, pp. 152-155 (In Russian).

11. Kuznetsov A.Zh. Stroenie i uslovija formirovanija magnetitovyh zalezhej Goroblago-datskogo zhelezorudnogo mestorozhdenija (Srednij Ural) Doct. Diss. [Structure and conditions of formation of magnetite deposits of Goroblagodatsky iron ore Deposit (Middle Urals). Doct. Diss.], Yekaterinburg, Ural state mining University Publ., 2008 (In Russian).

12. Ovchinnikov L.N. Kontaktovo-metasomaticheskie mestorozhdenija Severnogo i Srednego Urala [Contact-metasomatic deposits of the Northern and Middle Urals]. Trudy Gomo-geologicheskogo instituta UF AN SSSR — [Procedings of the mining and geological Institute of the Ural branch of the USSR Academy of Sciences], Vol. 89, Sverdlovsk, 1960, 495 p. (In Russian).

13. Oreshkin P.T. Jelektroprovodnost' ogneuporov i relaksacionnye javlenija na bar'emyh slojah — [The electrical conductivity of the refractories and relaxation phenomena on the barrier layers], Moscow, Metallurgija [Metallurgy Publ.] 1965, 152 p. (In Russian).

14. Skanavi G.I. Fizika dijelektrikov (oblasf slabyh polej) [Dielectric physics (region of weak fields)], Moscow-Leningrad, Gostekhteorizdat Publ., 1949, 500 p. (In Russian).

15. Tipomorfizm mineralov: Spravochnik — [Typomorphism of minerals: Reference book], Ed.: E.M. Chernysheva, M., Nedra Publ., 1989, 560 p. (In Russian).

16. Shteinberg D.C. Geologicheskoe stroenie Tagilo-Kushvinskogo zhelezorudnogo rajona [Geological structure of Tagil-Kushvinsky iron ore district]. Zhelezorudnaja baza Tagilo-Kushvinskogo promyshlennogo rajona — [Iron ore base of the Tagil-Kushvinsky industrial district], Sverdlovsk: Ural branch of the USSR Academy of Sciences. Publ., 1957, pp. 5—20 (In Russian).