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Doklady Earth Sciences

, Volume 450, Issue 1, pp 475–478 | Cite as

Indicator minerals of diamond in the lamproitic diatreme, Kostomuksha region, Karelia

  • V. Ya. Gor’kovets
  • N. S. Rudashevskii
  • V. N. Rudashevskii
  • M. G. Popov
  • A. V. Antonov
Geology

Abstract

The mineralogy of a new lamproitic diatreme 200–250 m in diameter and 3 ga in area is studied in detail. The chemical and 3-D mineralogical analysis identify the diatreme rocks as strongly altered olivine lamproites with a large volume (50–60%) of xenoliths of strongly altered spinel (garnet) lherzolites and harzburgites-dunites. Numerous grains-xenocrysts of indicator minerals of diamond have been extracted from the heavy concentrates (the weight of the initial product is 742 g and the size is 100–500 μm) as a result of hydroseparation: (1) subcalcium (CaOav. 2.6 wt %) high-Cr (Cr2O3 av. 5.3 wt %) pyrope (50 grains); (2) chrome diopside (7 and 8 mol % of kosmochlor and jadeite components, respectively, >40 grains); (3) high-Cr chromite (Cr2O3 > 62 wt %); and (4) picroilmenite (MgO 12–13.8 wt %) and Cr-rutile (Cr2O3 1.1 wt %). Xenocrysts prove the mantle endogene (the level of garnet lherzolites) source of the magmatic center of lamproites and forecast the diamond potential of the new diatreme in the Kostomuksha ore district.

Keywords

Chalcopyrite Ilmenite Chromite DOKLADY Earth Science Diopside 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    V. Ya. Gor’kovets, M. G. Popov, and M. B. Raevskaya, in Geology and Mineral Deposits of Karelia (KSC RAS, Petrozavodsk, 2009), Is. 12, pp. 94–99.Google Scholar
  2. 2.
    V. Ya. Gor’kovets, M. B. Raevskaya, G. F. Belousov, et al., Geology and Metallogeny of the Kostomuksha Iron Deposit Area (Karelia, Petrozavodsk, 1981) [in Russian].Google Scholar
  3. 3.
    M. P. Orlova and E. M. Shadenkov, Zap. VMO, No. 6, 33–43 (1992).Google Scholar
  4. 4.
    V. V. Proskuryakov, L. I. Uvad’ev, V. A. Zhuravlev, et al., Dokl. Acad. Sci. USSR 307(6) 1989.Google Scholar
  5. 5.
    E. V. Putintseva and A. G. Ul’yanov, in Riftogenesis, Magmatism, and Metallogeny of Precambrian. Correlation of Geological Complexes of Fennoscandia (Petrozavodsk, 1999), pp. 116–117.Google Scholar
  6. 6.
    M. B. Raevskaya and V. Ya. Gor’kovets, in Operative-Information Materials for 1977. Geology and Petrography (Petrozavodsk, 1978), pp. 47–51.Google Scholar
  7. 7.
    N. S. Rudashevskii and V. N. Rudashevskii, RF Patent No. 69418, 2007.Google Scholar
  8. 8.
    N. V. Sobolev, Endogene Inclusions in Kimberlites and Problem of the Upper Mantle Composition (Nauka, Novosibirsk, 1974) [in Russian].Google Scholar
  9. 9.
    N. V. Sobolev, A. M. Logvinova, and E. S. Efimova, Russian Geol. Geophys. 50(12), 1234 (2009).CrossRefGoogle Scholar
  10. 10.
    L. A. Taylor and Y. Liu, Russian Geol. Geophys. 50(12), 1201 (2009).CrossRefGoogle Scholar
  11. 11.
    N. P. Shcherbak, V. Ya. Gor’kovets, A. O. Dodatko, et al., Geol. Zh. 46(2) (1986).Google Scholar
  12. 12.
    J. B. Dawson and W. E. Stephens, J. Geol. 83(5), 589 (1975).CrossRefGoogle Scholar
  13. 13.
    R. H. Mitchell, Kimberlites, Orangeites, and Related Rocks (Plenum, NY, 1995).CrossRefGoogle Scholar
  14. 14.
    N. S. Rudashevskii, G. Garuti, J. C. O. Andersen, et al., Trans. Inst. Min. Metall. (Sect. B: Appl. Earth Sci.) 111, B87–B94 (2002).Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • V. Ya. Gor’kovets
    • 1
  • N. S. Rudashevskii
    • 2
  • V. N. Rudashevskii
    • 2
  • M. G. Popov
    • 1
  • A. V. Antonov
    • 3
  1. 1.Institute of Geology, Karelian Scientific CenterRussian Academy of SciencesPetrozavodsk, Republic of KareliaRussia
  2. 2.OOO PC+St. PetersburgRussia
  3. 3.Karpinskii All-Russia Geological Research Institute (VSEGEI)St. PetersburgRussia

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