TY - JOUR

T1 - Platinum-bearing placers

T2 - MINERAL ASSOCIATIONS AND THEIR Pt-190-He-4 AND Re-Os AGES, AND POTENTIAL LINKS WITH LARGE IGNEOUS PROVINCES IN THE SIBERIAN CRATON

AU - Okrugin, A. V.

AU - Yakubovich, O. V.

AU - Ernst, R. E.

AU - Druzhinina, Zh. Yu.

N1 - Funding Information: The authors are thankful to all colleagues who took part in the field, laboratory, and analytical work and helped substantially in conducting this study. The manuscript benefited from the suggestions of reviewers Steve Barnes and Pedro Water-ton, associate editor David Holwell, and chief editor, Larry Meinert. The work was done in the framework of Research Program of DPMGI, SB RAS (projects 0381-2019-0003, 0381-2019-0004), with the support of the Russian Foundation for Basic Research (project 17-05-00390) and RF President Council grants MK-3205.2019.5. REE is also partially supported by Russian Mega-Grant 14.Y26.31.0012. Publisher Copyright: © 2020 Society of Economic Geologists, Inc. All rights reserved. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/12

Y1 - 2020/12

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85097345133&partnerID=8YFLogxK

U2 - 10.5382/ECONGEO.4773

DO - 10.5382/ECONGEO.4773

M3 - Article

AN - SCOPUS:85097345133

VL - 115

SP - 1835

EP - 1853

JO - Economic Geology

JF - Economic Geology

SN - 0361-0128

IS - 8

ER -