Mineralization in the Kildyam mafic volcanic rocks – a magmatic contribution to ore-forming fluids (Central Yakutia, Russia)
https://doi.org/10.31242/2618-9712-2021-26-2-3
Аннотация
Mineral assemblages and processes occurring in olivine-pyroxenites, andesite, and dacite volcanic settings of the Kildyam Late Jurassic complex in Central Yakutia are investigated. The methods involved in the study include detailed sensing and mapping using ESRI ArcGis.Imagery Service, field observations, minerals and glass identification, recognition of vesicle composition. The results obtained in the study support the igneous vapor transport of ore elements in the andesitic system and imply preconcentration of iron, copper and ± gold and silver during lava solidification into magnetite rich lava flows. The major components of the Kildyam andesite alloys are Fe, Cu, Sn, Pb, Zn, and Ag. Alloy element maps show a covariance of Cu±(Zn, Sn, Ni, Fe), and Ag concentrations varied independently. This research confirmed that tholeitic trend of iron-rich olivine-pyroxenites evolve towards two immiscible liquids: (1) magnetite lava, and (2) melilitite matrix. Further evolution leads to the separation of native iron and the transition of lavas to the calc-alkaline trend. Petrographic and microprobe studies confirmed the liquid immiscibility in silicate melts during crystallization. Immiscible liquids are preserved as globules of one glass in another in andesites and as melted inclusions of native iron in the matrix, clinopyroxene and plagioclase phenocrysts. The vesiclehosted alloys and sulfides provide significant new data on metal transportation and precipitation from hightemperature magmatic vapors. During syneruptive vapor phase exsolution, volatile metals (Cu–Zn, Fe–Al– Cu, Ni–Fe–Cu–Sn) and Ag–Cu sulfides contribute to the formation of economic concentrations.
Ключевые слова
Kildyam volcanic complex,
liquid immiscibility,
metallic alloys,
melilitic and magnetite lavas,
copper,
silver
При поддержке: This research was funded by Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences, project number 0381-2019-004.
Об авторе
А. V. Kostin
Diamond and Precious Metal Geology Institute, SB RAS
Россия
Россия
KOSTIN Aleksey Valentinovich, Dr. Sci. (Geology and Mineralogy), chief reseacher
39 Lenina pr., Yakutsk 677000
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Рецензия
Для цитирования:
Kostin А.V. Mineralization in the Kildyam mafic volcanic rocks – a magmatic contribution to ore-forming fluids (Central Yakutia, Russia). Природные ресурсы Арктики и Субарктики. 2021;26(2):49-71. https://doi.org/10.31242/2618-9712-2021-26-2-3
For citation:
Kostin A.V. Mineralization in the Kildyam mafic volcanic rocks – a magmatic contribution to ore-forming fluids (Central Yakutia, Russia). Arctic and Subarctic Natural Resources. 2021;26(2):49-71. https://doi.org/10.31242/2618-9712-2021-26-2-3
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