190Pt-4He dating of platinum mineralization in Ural-Alaskan-type complexes in the Kamchatka region: evidence for remobilization of platinum-group elements

Yakubovich, Olga, Kutyrev, Anton ORCID: https://orcid.org/0000-0001-5933-6455, Sidorov, Evgeniy and Travin, Alexei 2022. 190Pt-4He dating of platinum mineralization in Ural-Alaskan-type complexes in the Kamchatka region: evidence for remobilization of platinum-group elements. Mineralium Deposita 57 (5) , pp. 743-758. 10.1007/s00126-022-01103-5

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Abstract

Ural-Alaskan-type zonal mafic–ultramafic complexes are the predominant source of platinum-group minerals (PGM) in alluvial deposits worldwide. Processes responsible for the formation of mm-sized grains of Pt-Fe alloys within these deposits remain a subject of ongoing debate. In this study, the 190Pt-4He dating method is applied to isoferroplatinum from the Ural-Alaskan-type Matysken, Itchayvayam, and Filippa complexes of the Koryak-Kamchatka Platinum Belt in order to determine the timing of Pt mineralization and its relation to the regional and local geologic history of the source rocks. Results of 190Pt-4He dating indicate multistage Pt mineralization, with at least two generations recognized. The first generation (70 ± 2 Ma and 77 ± 2 Ma for the northern and southern parts of the Belt, respectively) is contemporaneous with intra-oceanic arc magmatism, which resulted in the formation of the dunite-clinopyroxenite complexes. The second generation is significantly younger (~ 64 Ma), and reflects a later mineralization or recrystallization event following the termination of active volcanism within the Olyutorsky Arc evolution.

Item Type:	Article
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	Springer
ISSN:	0026-4598
Date of Acceptance:	27 February 2022
Last Modified:	05 Nov 2024 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/173104

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