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Isotope Geology of the Norilsk DepositsIsotope Chronology of Geological Processes

Isotope Geology of the Norilsk Deposits: Isotope Chronology of Geological Processes [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.] http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Isotope Geology of the Norilsk DepositsIsotope Chronology of Geological Processes

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Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2019. Translation from the Russian language edition Изотопная геология норильских месторождений, © Коллектив авторов 2017, © ФГБУ «Всероссийский научно-исследовательский геологический институт им. А. П. Карпинского» 2017. Published by Издательство ВСЕГЕИ. All Rights Reserved.
ISBN
978-3-030-05215-7
Pages
215 –302
DOI
10.1007/978-3-030-05216-4_8
Publisher site
See Chapter on Publisher Site

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.]

Published: May 9, 2019

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