Abstract
The chapter presents new geochronologic results of various isotope techniques (U–Pb SIMS and Re–Os TIMS) along with their comparison with already published data. The main intrusions of the Norilsk district are demonstrated to be emplaced almost simultaneously with two possible magma intrusion pulses at 254 ± 4 and 244 ± 4 Ma (U–Pb SIMS), assuming c. 10 Ma duration of igneous activity. This is corroborated by sulfides Re–Os dating (245–250 Ma), suggestion synchroneity of intrusion and the ore formation. Some Permian and Carboniferous zircon xenocrysts have been found along with Precambrian grains (c. 1.9 and 2.7 Ga), while no Devonian xenocrysts has been revealed. A group of 145–150 Ma old mafic rocks has also been discovered: those nature and relation to the ore-bearing Norilsk intrusions yet to be studied. The geochronologic study suggests, that: (1) ore-bearing massifs belong to the early emplacement phase (250–255 Ma); (2) ore-bearing massifs contain xenogenic Palaeozoic zircons, pointing to important role of the host-rocks; (3) Late Triassic igneous activity (225–230 Ma) has not affected ore systems.
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Petrov, O. et al. (2019). Isotope Chronology of Geological Processes. In: Petrov, O. (eds) Isotope Geology of the Norilsk Deposits. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-030-05216-4_8
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DOI: https://doi.org/10.1007/978-3-030-05216-4_8
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