Email this article Mineralogical-geochemical types and 190Pt-4He age of ferroan platinum of placers of the Anabar River basin, northeastern part of the Siberian Platform
- Authors: Okrugin A.V.1, Yakubovich O.V.2,3, Gedz A.M.2,3, Zemnukhov A.L.4, Ivanov P.O.4
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Affiliations:
- Diamond and Precious Metal Geology Institute of Siberian Branch Russian Academy of Sciences
- Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences
- Saint-Petersburg State University
- JSC “Almazy Anabara”
- Issue: Vol 484, No 6 (2019)
- Pages: 716-720
- Section: Geology
- URL: https://journals.eco-vector.com/0869-5652/article/view/12883
- DOI: https://doi.org/10.31857/S0869-56524846716-720
- ID: 12883
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Abstract
Typical features of platinum group minerals (PGMs) and the results of 190Pt–4He dating of the Fe–Pt solid solutions are presented for complex gold–platinum–diamond placers with unidentified sources of the Anabar River basin. For the first time, the 190Pt–4He isotopic system is used for determination of the possible age of the primary source of a PGM placer from the example of ferroan platinum with a disordered structure along with isoferro- platinum. The PGMs of these placers mostly include ferroan platinum and isoferroplatinum and rare Ru–Ir–Os alloys. The calculated bulk composition of the silicate inclusion of Ir platinum corresponds to the rocks of the ijolite–melteigite series. The 190Pt–4He age of the Fe–Pt solid solution grains is 261 ± 13 Ma. Thus, our data indicate the relation between placer PGMs of the Anabar River basin and Permian-Triassic complexes of alkaline-ultramafic rocks.
About the authors
A. V. Okrugin
Diamond and Precious Metal Geology Institute of Siberian Branch Russian Academy of Sciences
Author for correspondence.
Email: a.v.okrugin@diamond.ysn.ru
Russian Federation, 39, Lenin avenue, Yakutsk, 677980
O. V. Yakubovich
Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences; Saint-Petersburg State University
Email: a.v.okrugin@diamond.ysn.ru
Russian Federation, 2, Makarova embankment, St.Petersburg, 199034; 7/9, Universitetskaya embankment, Saint-Petersburg, 199034
A. M. Gedz
Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences; Saint-Petersburg State University
Email: a.v.okrugin@diamond.ysn.ru
Russian Federation, 2, Makarova embankment, St.Petersburg, 199034; 7/9, Universitetskaya embankment, Saint-Petersburg, 199034
A. L. Zemnukhov
JSC “Almazy Anabara”
Email: a.v.okrugin@diamond.ysn.ru
Russian Federation, 86/4, 50 Let Sovetskoy Armii, Yakutsk, Republic of Sakha (Yakutia), 677000
P. O. Ivanov
JSC “Almazy Anabara”
Email: a.v.okrugin@diamond.ysn.ru
Russian Federation, 86/4, 50 Let Sovetskoy Armii, Yakutsk, Republic of Sakha (Yakutia), 677000
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