The latest Aptian / earliest Albian age of the Kekura gold deposit, Western Chukotka, Russia: Implications for mineralization associated with post-collisional magmatism

Nagornaya, E.V; Baksheev, I.A; Selby, D; Tikhomirov, P.L

doi:10.1007/s00126-020-00969-7

The latest Aptian / earliest Albian age of the Kekura gold deposit, Western Chukotka, Russia: Implications for mineralization associated with post-collisional magmatism

Nagornaya, E.V; Baksheev, I.A; Selby, D; Tikhomirov, P.L

Authors

E.V Nagornaya

I.A Baksheev

Professor David Selby
Professor

P.L Tikhomirov

Abstract

The Kekura gold deposit (76.2 t Au at 8.1 g/t) is situated in Western Chukotka, a region that hosts several Au, Ag, Cu, and Mo deposits and prospects. The Kekura deposit is related to the eponymous granite intrusion that is cut by porphyry dikes. The U-Pb zircon age of one of these dikes is 112 ± 1 Ma (2σ) that corresponds to the latest Aptian/earliest Albian. Both intrusion and dikes are hydrothermally altered and are cut by gold-quartz and molybdenite-quartz veins and stringers. Two molybdenite samples yield Re-Os model ages of 112.5 ± 0.6 and 112.3 ± 0.6 Ma (2σ). These Re-Os ages indicate the close temporal relationship between the molybdenite mineralization and the porphyry dikes. The age of the Kekura mineral system is similar to that of the post-collisional granitic plutons of the Anyui zone spatially scattered, between 140 and 210 km northwest of Kekura. We suggest that this temporal relationship may increase the likelihood of further discoveries of economic gold mineralization related to the currently underexplored Aptian post-collisional magmatic complexes of the Western Chukotka area.

Citation

Nagornaya, E., Baksheev, I., Selby, D., & Tikhomirov, P. (2020). The latest Aptian / earliest Albian age of the Kekura gold deposit, Western Chukotka, Russia: Implications for mineralization associated with post-collisional magmatism. Mineralium Deposita, 55(7), 1255-1262. https://doi.org/10.1007/s00126-020-00969-7

Journal Article Type	Article
Acceptance Date	Feb 26, 2020
Online Publication Date	Mar 10, 2020
Publication Date	2020-10
Deposit Date	Mar 5, 2020
Publicly Available Date	Mar 10, 2021
Journal	Mineralium Deposita
Print ISSN	0026-4598
Electronic ISSN	1432-1866
Publisher	Springer
Peer Reviewed	Peer Reviewed
Volume	55
Issue	7
Pages	1255-1262
DOI	https://doi.org/10.1007/s00126-020-00969-7

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Copyright Statement
This is a post-peer-review, pre-copyedit version of an article published in Mineralium deposita. The final authenticated version is available online at: https://doi.org/10.1007/s00126-020-00969-7