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  • Presentation | V41D: Reimaging, Reinvestigating, and Reinterpreting the Continental Crust, Including the Evolution and Longevity of Its Magmatic Systems II Poster
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  • V41D-0100: Contributions of metasomatized lithosphere or asthenosphere to the formation of magmatic Ni-Cu-PGE deposits: Evidence from the Norilsk 1 deposit
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  • Board 0100‚ Hall EFG (Poster Hall)
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Author(s):
Aleksandr Marfin, Indiana University Bloomington (First Author, Presenting Author)
Matthew Brzozowski, Chang'an University
Peter Lightfoot, University of Western Ontario
Xin Ding, University of Science and Technology of China
Michael Bizimis, University of South Carolina
Shelby Rader, Indiana University Bloomington
Molly Karnes, Indiana University Bloomington
Valeriya Brovchenko, Institute of Geology of Ore Deposits Mineralogy, Petrography, and Geochemistry
Tatyana Radomskaya, Vinogradov Institute of Geochemistry SB RAS
Alexei Ivanov, Institute of the Earth’s Crust SB RAS
Olga Belozerova, Vinogradov Institute of Geochemistry SB RAS


There are uncertainties about the source of magma which form sulfide metal deposits. The Norilsk 1 deposit in Siberia is a classic example of such a deposit, and its rocks have chemical and isotopic features that suggest a deep mantle source, but also show signs of influence from recycled components and the upper crust.


New research investigates the copper isotopic composition of chalcopyrite from the Norilsk 1 deposit and finds a broad range of values, which is more variable than in the deep mantle. This suggests that the magma may have originated from specific zones in the Siberian craton mantle, which formed when fluids from old subducted ocean plates were added to the overlying mantle. These veins have contrasting copper isotopic compositions compared to the normal mantle and can change the copper isotopic signatures in the resulting magma.


Overall, the findings suggest that the metal-rich deposits at Norilsk 1 formed from mantle sources that were altered by ancient subduction processes, rather than from a hot deep mantle source.




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