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Petrology

, Volume 20, Issue 6, pp 491–505 | Cite as

New geochronometer for the direct isotopic dating of native platinum minerals (190Pt-4He method)

  • Yu. A. ShukolyukovEmail author
  • O. V. Yakubovich
  • A. G. Mochalov
  • A. B. Kotov
  • E. B. Sal’nikova
  • S. Z. Yakovleva
  • S. I. Korneev
  • B. M. Gorokhovskii
Article

Abstract

A new method of isotope geochronology was proposed for dating native platinum minerals on the basis of the α-decay of the natural isotope 190Pt. The analysis of the thermal desorption of helium in the crystal lattice of native metals, including platinum, allowed us to predict a very high thermal stability (retentivity) of radiogenic 4He in native platinum minerals up to their melting temperatures. In order to validate the proposed 190Pt-4He method, direct isotopic dating was performed for isoferroplatinum from the Galmoenan dunite-clinopyroxenite and Kondyor alkaline ultramafic massifs. The results of dating obtained by this method for primary ore platinum from the Galmoenan Massif (70 ± 5 Ma) are consistent with geological observations and mean Sm-Nd and Rb-Sr isotopic age estimates. The 190Pt-4He age obtained for placer isoferroplatinum from the Kondyor Massif (112 ± 7 Ma) also agrees with geological observations and is close to the K-Ar and Rb-Sr ages of koswites (phlogopite-magnetite pyroxenites, gabbros, nepheline syenites, and metasomatic rocks after dunites). Our experimental data demonstrated that the 190Pt-4He method is a promising tool for dating native platinum minerals.

Keywords

Olivine Helium Atom Metasomatic Rock Nepheline Syenite Chrome Spinel 
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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Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • Yu. A. Shukolyukov
    • 1
    • 2
    Email author
  • O. V. Yakubovich
    • 1
    • 2
  • A. G. Mochalov
    • 1
  • A. B. Kotov
    • 1
  • E. B. Sal’nikova
    • 1
  • S. Z. Yakovleva
    • 1
  • S. I. Korneev
    • 2
  • B. M. Gorokhovskii
    • 1
  1. 1.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Faculty of GeologySt. Petersburg State UniversitySt. PetersburgRussia

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