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Contact metamorphic and metasomatic processes at the Kharaelakh intrusion, Oktyabrsk deposit, Norilsk-Talnakh ore district: Application of LA-ICP-MS dating of perovskite, apatite, garnet, and titanite

Marfin, AE, Ivanov, AV, Kamenetsky, VS ORCID: 0000-0002-2734-8790, Abersteiner, A, Yakich, TY and Dudkin, TV 2020 , 'Contact metamorphic and metasomatic processes at the Kharaelakh intrusion, Oktyabrsk deposit, Norilsk-Talnakh ore district: Application of LA-ICP-MS dating of perovskite, apatite, garnet, and titanite' , Economic Geology, vol. 115, no. 6 , pp. 1213-1226 , doi: 10.5382/ECONGEO.4744.

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Abstract

The Norilsk-Talnakh ore district in the northwestern Siberian platform contains globally unique reserves of Cu-Ni-sulfides with Pt and, especially, Pd. The Oktyabrsk deposit, which is one of the largest in the district, is spatially and genetically associated with the Kharaelakh mafic-ultramafic intrusion and its exceptionally large metamorphic and metasomatic aureoles. In this study, we employed in situ laser ablation-inductively coupled plasma-mass spectrometry U-Pb isotope dating of apatite, titanite, garnet, and perovskite that cocrystallize with disseminated sulfides within the aureole of metasomatic and contact metamorphic rocks. The calculated isotopic ages for apatite (257.3 ± 4.5 and 248.9 ± 5.1 Ma), titanite (248.6 ± 6.8 and 249.1 ± 2.9 Ma), garnet (260.0 ± 11.0 Ma), and perovskite (247.3 ± 8.2 Ma), though with large uncertainties, indicate that sulfide mineralization within metasomatic and contact-metamorphic rocks is coeval with the emplacement of the Kharaelakh intrusion. These isotopic dates are in complete agreement with the published isotope dilution-thermal ionization mass spectrometry U-Pb zircon ages for the Norilsk intrusions and, at the same time, notably older than available Re-Os isochron ages of sulfides. The latter ages have been long interpreted as evidence for a prolonged duration of magmatic ore-forming processes; however, our data narrow their life span. Trace elements in titanite and garnet allow distinguishing late- and postmagmatic grains, which show indistinguishable U-Pb isotope ages.

Item Type: Article
Authors/Creators:Marfin, AE and Ivanov, AV and Kamenetsky, VS and Abersteiner, A and Yakich, TY and Dudkin, TV
Keywords: Norilsk, apatite, titanite, perovskite, Cu-Ni ore, noble metals
Journal or Publication Title: Economic Geology
Publisher: Economic Geology Publ Co
ISSN: 0361-0128
DOI / ID Number: 10.5382/ECONGEO.4744
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©2020 Society of Economic Geologists, Inc

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