New Data on the Reduced Intrusion-Related Au Mineralization of the Central Kolyma Gold Region: Age, Formation Conditions, Composition, Ore-Controlling Factors

New data are presented on the formation conditions and ages of the reduced intrusion-related Au mineralization of the Vetrenskaya area in the Central Kolyma region. The mineralization is predominantly confined to intersections of Late Jurassic minor intrusive bodies and NE-trending fracture systems...

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Published inGeology of ore deposits Vol. 66; no. 5; pp. 629 - 643
Main Authors Pachersky, N. V., Kryazhev, S. G., Naumov, E. A., Desyatova, D. Yu, Dvurechenskaya, S. S., Samoilenko, M. V.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 2024
Springer Nature B.V
Subjects
Arsenopyrite
Bismuth
Chalcopyrite
Earth and Environmental Science
Earth Sciences
Fineness
Gold
Heavy metals
Intrusion
Jurassic
Low temperature
Mineral deposits
Mineral Resources
Mineralization
Minerals
Orogeny
Pyrite
Pyrrhotite
Quartz
Tellurides
gold
Central Kolyma region
reduced intrusion-related Au ore formational type
tungsten
fluid inclusions
Vetrenskaya area
reduced intrusion-related gold systems
absolute age
Re–Os
bismuth
molybdenum
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Summary:New data are presented on the formation conditions and ages of the reduced intrusion-related Au mineralization of the Vetrenskaya area in the Central Kolyma region. The mineralization is predominantly confined to intersections of Late Jurassic minor intrusive bodies and NE-trending fracture systems and is represented by zones of thin quartz veinlets with sericite–quartz halos. The major ore mineral is gold-bearing arsenopyrite (up to 10%), while minor minerals are represented by lellingite, pyrite, chalcopyrite, and pyrrhotite. Microscopic native gold of a low fineness is paragenetically associated with bismuth minerals (bismuthine, native bismuth, and tellurides of Bi and Au), forming microinclusions (1–10 μm) in the arsenopyrite. The isochronous Re–Os age of the goldbearing arsenopyrite is 137–117 Ma, which suggests the mineralization was formed significantly later than the hosting granitoids (147–153 Ma). The reduced intrusion-related Au ore deposit was formed at shallower depths than orogenic Au deposits were and at lower temperatures in comparison with rare-metal (W, Mo) ore deposits.
ISSN:1075-7015
1555-6476
DOI:10.1134/S1075701524600440