190Pt–4He Dating of Placer-Forming Minerals of Platinum from the Chad Alkaline–Ultramafic Massif: New Evidence of the Polycyclic Nature of Ore Formation

A. G. Mochalov; O. V. Yakubovich; N. S. Bortnikov

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190Pt–4He Dating of Placer-Forming Minerals of Platinum from the Chad Alkaline–Ultramafic Massif: New Evidence of the Polycyclic Nature of Ore Formation

机译：190Pt–4He Dating of Placer-Forming Minerals of Platinum from the Chad Alkaline–Ultramafic Massif: New Evidence of the Polycyclic Nature of Ore Formation

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Abstract The results of 190Pt–4He dating of placer-forming platinum-group minerals (PPMs) from the placer deposits of Mokhovoi Creek, its tributaries, and eluvial and proluvial deposits of the peneplain surface of dunites of the Chad alkaline-ultramafic massif (Aldan Shield, Ayan-Maya district of Khabarovsk krai) are presented. 190Pt and 4He were measured in 27 samples. The statistical processing of the mineralogical and geochemical data allows us to separate three 190Pt–4He age isochrones (Ma): 123 ± 6; 113 ± 6; and 107 ± 6, which is in good agreement with the geological observations and the mineralogy of the platinum group elements (PGEs) of the Chad massif. The range of 190Pt–4He age isochrones indicates that platinum-metal ore formation occurred over 16 Myr. The geological and mineralogical data and the 190Pt–4He isochrones of different ages allow us to conclude that the platinum-metal ore formation in the Chad massif was polycyclic during the Early Cretaceous. A comparison of the 190Pt–4He ages of the PPMs of the Chad and Kondyor alkaline-ultramafic massifs indicates that there are temporal features between the platinum ore formation and the formation of these plutons during the Mesozoic tectonic–magmatic activation of the Aldan Shield.

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《Doklady earth sciences》 |2022年第1期|240-247|共8页
作者
A. G. Mochalov; O. V. Yakubovich; N. S. Bortnikov;
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作者单位

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences;

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences||St. Petersburg State University;

Institute of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences;

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正文语种英语
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platinum group minerals; mineralogical–geochemical types; genesis; ultramafic rocks; alkaline rocks; 190Pt–4He dating; Chad massif; Aldan Shield;

190Pt–4He Dating of Placer-Forming Minerals of Platinum from the Chad Alkaline–Ultramafic Massif: New Evidence of the Polycyclic Nature of Ore Formation

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