~(190)Pt-~4He Age of Native Platinum Minerals of the Baimka Gold Placer Cluster, Western Chukotka

E. A. Vlasov; E. S. Ivanova; A. G. MochalovO. V. Yakubovich

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~(190)Pt-~4He Age of Native Platinum Minerals of the Baimka Gold Placer Cluster, Western Chukotka

机译：~(190)Pt-~4He Age of Native Platinum Minerals of the Baimka Gold Placer Cluster, Western Chukotka

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The results of ~(190)Pt-~4He dating of placer-forming minerals of platinum (PMP) from the Baimka gold placer cluster (Western Chukotka, Russia) are reported. PMPs are represented by isoferroplatinum with a composition of Pt_(3+x)-Fe_(1-x). and Pt_3Fe. The concentrations of ~(190)Pt and ~4He in 14 PMP samples were obtained. The results of ~(190)Pt-~4He dating showed the existence of two age clusters of PMP (148 ± 6 and 188 ± 4 Ma) for the first time. The primary sources of PMP, which are similar in their genetic type, but have different ages, are assumed: (1) later, 148 ± 6 Ma of the Baimka Complex (J_3b) and (2) earlier, 188 ± 4 Ma. PMPs enter alluvial gold placers mainly from the intermediate PGM reservoir, which is composed of rocks of the Volgian stage J_3v_(2-3) (Tithonian). Thus, sedimentary rocks or explosive breccia of andesite-basalt of the Vol-gian stage could be the PMP source reservoir.

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《Doklady earth sciences》 |2022年第1期|881-886|共6页
作者
E. A. Vlasov; E. S. Ivanova; A. G. MochalovO. V. Yakubovich;
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Moscow State University, Moscow, 119991 Russia;

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, 199034 Russia,St. Petersburg State University, St. Petersburg, 199034 Russia;

St. Petersburg State University, St. Petersburg, 199034 Russia;

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platinum group minerals; Baimka gold placer cluster; Western Chukotka; ~(190)Pt-~4He dating;

~(190)Pt-~4He Age of Native Platinum Minerals of the Baimka Gold Placer Cluster, Western Chukotka

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