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Contact metamorphic and metasomatic processes at the Kharaelakh Intrusion, Oktyabrsk Deposit, Norilsk-Talnakh ore district; application of laser ablation-inductively coupled plasma-mass spectrometry dating of perovskite, apatite, garnet, and titanite

Alexander E. Marfin, Alexei V. Ivanov, Vadim S. Kamenetsky, Adam Abersteiner, Tamara Yu. Yakich and Timur V. Dudkin
Contact metamorphic and metasomatic processes at the Kharaelakh Intrusion, Oktyabrsk Deposit, Norilsk-Talnakh ore district; application of laser ablation-inductively coupled plasma-mass spectrometry dating of perovskite, apatite, garnet, and titanite
Economic Geology and the Bulletin of the Society of Economic Geologists (July 2020) 115 (6): 1213-1226

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+ or -4.5 and 248.9+ or -5.1 Ma), titanite (248.6+ or -6.8 and 249.1+ or -2.9 Ma), garnet (260.0+ or -11.0 Ma), and perovskite (247.3+ or -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.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 115
Serial Issue: 6
Title: Contact metamorphic and metasomatic processes at the Kharaelakh Intrusion, Oktyabrsk Deposit, Norilsk-Talnakh ore district; application of laser ablation-inductively coupled plasma-mass spectrometry dating of perovskite, apatite, garnet, and titanite
Affiliation: Russian Academy of Sciences, Siberian Branch, Institute of the Earth's Crust, Irkutsk, Russian Federation
Pages: 1213-1226
Published: 20200701
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 80
Accession Number: 2020-059223
Categories: GeochronologyEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sect., 2 tables, sketch map
N69°00'00" - N69°45'00", E87°00'00" - E89°00'00"
Secondary Affiliation: Russian Academy of Sciences, Institute of Experimental Mineralogy, RUS, Russian FederationUniversity of Tasmania, AUS, AustraliaTomsk Polytechnic University, RUS, Russian Federation
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202036
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