Th/U Chronology and Geochemistry of Irinovskoe Hydrothermal Field

The results of [sup.230]Th/U dating and mineralogical-geochemical studies of sulfide ores from the Irinovskoe hydrothermal field and the Severo-Zapadnoe ore occurrence (Mid-Atlantic Ridge) are presented. Sulfides are represented primarily by copper-sulfide ores with 12-30% Cu content; sulfur- and zi...

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Bibliographic Details
Published in:Doklady earth sciences 2018-01, Vol.478 (1), p.26
Main Authors: Kuznetsov, V.Yu, Tabuns, E.V, Cherkashev, G.A, Beltenev, V.E, Maksimov, F.E, Kuksa, K.A, Lazareva, L.I, Levchenko, S.B, Zherebtsov, I.E
Format: Article
Language:English
Subjects:
Chronologies
Mid-ocean ridges
Sulfides
Zinc compounds
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Summary:The results of [sup.230]Th/U dating and mineralogical-geochemical studies of sulfide ores from the Irinovskoe hydrothermal field and the Severo-Zapadnoe ore occurrence (Mid-Atlantic Ridge) are presented. Sulfides are represented primarily by copper-sulfide ores with 12-30% Cu content; sulfur- and zinc-sulfide ores are distributed less frequently. The analysis of a change in the composition of sulfides over time has made it possible to identify three stages of formation. Each stage assumes that mineral associations are changed from high-temperature (sulfur and copper sulfide) to medium temperature (Zn-Cu and Zn-sulfide) sulfide ores. The whole age range of formation of the hydrothermal deposits falls within the time interval of about 58000-8000 for the Irinovskoe field and 69000-11000 years ago for the Severo-Zapadnoe ore occurrence.
ISSN:1028-334X
DOI:10.1134/S1028334X18010142