TY - JOUR

T1 - 190Pt-4He dating of platinum mineralization in Ural-Alaskan-type complexes in the Kamchatka region: evidence for remobilization of platinum-group elements

AU - Yakubovich, Olga

AU - Kutyrev, Anton

AU - Sidorov, Evgeniy

AU - Travin, Alexei

N1 - Funding Information: This research was supported by the Russian Science Foundation (19–77-00097). Ar/Ar study was carried out within the framework of a State Assignment of Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk. 40 39 Publisher Copyright: © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2022/6

Y1 - 2022/6

N2 - 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.

AB - 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.

KW - Pt-He

KW - Geochronology of ore-forming processes

KW - Platinum-group minerals

KW - Ural-Alaskan-type complexes

KW - 190Pt-4He

UR - http://www.scopus.com/inward/record.url?scp=85126314146&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/e7e29586-b02d-374e-873b-d8e3eb15d4bd/

U2 - 10.1007/s00126-022-01103-5

DO - 10.1007/s00126-022-01103-5

M3 - Article

AN - SCOPUS:85126314146

VL - 57

SP - 743

EP - 758

JO - Mineralium Deposita

JF - Mineralium Deposita

SN - 0026-4598

IS - 5

ER -