Placer deposits in the Siberian platform are closely associated with well-known platiniferous intrusions (Kondyor, Inagli, Noril’sk, Chiney, and Guli) but there are also abundant platinum-group mineral (PGM) placers of large areal extent in the river basins of Siberia (Vilyui, Lena, Aldan, Anabar, and Olenek) for which the primary sources are unknown. The ¹⁹⁰Pt-⁴He dating method is introduced, compared with existing Re-Os isotope dating of PGMs, and applied to Pt-bearing placers of Siberia. Correlations between the ¹⁹⁰Pt-⁴He and Re-Os isotope ages of the PGMs and with ages of major magmatic events in the Siberian craton show that the potential sources for some of the placers are likely buried Precambrian mafic-ultramafic intrusions of Large Igneous Provinces (LIP). The approach of this paper can be applied to other cratonic areas with alluvial PGMs of unknown origin.

中文翻译：

---

含铂的矿物：西伯利亚克拉通的矿物协会及其190 Pt-4 He和Re-Os年龄，以及与大型火成岩省的潜在联系

西伯利亚平台中的砂矿沉积物与著名的白垩纪侵入岩（康迪尔，Inagli，诺里尔斯克，奇尼和古利）密切相关，但在流域也有大量的铂族矿物（PGM）矿砂，分布面积较大西伯利亚（Vilyui，Lena，Aldan，Anabar和Olenek）的主要来源未知。在¹⁹⁰铂- ⁴被引入他关系的方法，与现有的Re-Os同位素定铂族金属的比较，并且施加到西伯利亚的含铂砂矿。¹⁹⁰ Pt- ⁴之间的相关性PGM的He和Re-Os同位素年龄以及西伯利亚克拉通的主要岩浆事件年龄表明，某些砂矿的潜在来源可能是大火成岩省（LIP）埋藏的前寒武纪黑镁质-超镁铁质侵入体。本文的方法可以应用于其他来源不明的冲积型PGM的克拉通地区。