Fluids as primary carriers of sulphur and copper in magmatic assimilation

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Ville J. Virtanen
  • Jussi S. Heinonen
  • Ferenc Molnár
  • Max W. Schmidt
  • Felix Marxer
  • Pietari Skyttä
  • Nico Kueter
  • Karina Moslova

Externe Organisationen

  • Universität Helsinki
  • Eotvos Lorand University
  • Geological Survey of Finland (GTK)
  • ETH Zürich
  • University of Turku
  • Carnegie Institution of Washington
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer6609
Seitenumfang12
FachzeitschriftNature Communications
Jahrgang12
Ausgabenummer1
Frühes Online-Datum16 Nov. 2021
PublikationsstatusVeröffentlicht - Dez. 2021

Abstract

Magmas readily react with their wall-rocks forming metamorphic contact aureoles. Sulphur and possibly metal mobilization within these contact aureoles is essential in the formation of economic magmatic sulphide deposits. We performed heating and partial melting experiments on a black shale sample from the Paleoproterozoic Virginia Formation, which is the main source of sulphur for the world-class Cu-Ni sulphide deposits of the 1.1 Ga Duluth Complex, Minnesota. These experiments show that an autochthonous devolatilization fluid effectively mobilizes carbon, sulphur, and copper in the black shale within subsolidus conditions (≤ 700 °C). Further mobilization occurs when the black shale melts and droplets of Cu-rich sulphide melt and pyrrhotite form at ∼1000 °C. The sulphide droplets attach to bubbles of devolatilization fluid, which promotes buoyancy-driven transportation in silicate melt. Our study shows that devolatilization fluids can supply large proportions of sulphur and copper in mafic–ultramafic layered intrusion-hosted Cu-Ni sulphide deposits.

ASJC Scopus Sachgebiete

Zitieren

Fluids as primary carriers of sulphur and copper in magmatic assimilation. / Virtanen, Ville J.; Heinonen, Jussi S.; Molnár, Ferenc et al.
in: Nature Communications, Jahrgang 12, Nr. 1, 6609, 12.2021.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Virtanen, VJ, Heinonen, JS, Molnár, F, Schmidt, MW, Marxer, F, Skyttä, P, Kueter, N & Moslova, K 2021, 'Fluids as primary carriers of sulphur and copper in magmatic assimilation', Nature Communications, Jg. 12, Nr. 1, 6609. https://doi.org/10.1038/s41467-021-26969-3
Virtanen, V. J., Heinonen, J. S., Molnár, F., Schmidt, M. W., Marxer, F., Skyttä, P., Kueter, N., & Moslova, K. (2021). Fluids as primary carriers of sulphur and copper in magmatic assimilation. Nature Communications, 12(1), Artikel 6609. https://doi.org/10.1038/s41467-021-26969-3
Virtanen VJ, Heinonen JS, Molnár F, Schmidt MW, Marxer F, Skyttä P et al. Fluids as primary carriers of sulphur and copper in magmatic assimilation. Nature Communications. 2021 Dez;12(1):6609. Epub 2021 Nov 16. doi: 10.1038/s41467-021-26969-3
Virtanen, Ville J. ; Heinonen, Jussi S. ; Molnár, Ferenc et al. / Fluids as primary carriers of sulphur and copper in magmatic assimilation. in: Nature Communications. 2021 ; Jahrgang 12, Nr. 1.
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AU - Schmidt, Max W.

AU - Marxer, Felix

AU - Skyttä, Pietari

AU - Kueter, Nico

AU - Moslova, Karina

N1 - Funding Information: Dean Peterson and the staff of the Hibbing Drill Core Library of the Minnesota Department of Natural Resources, Lands, and Minerals Division are acknowledged for helping in acquiring the black shale sample. Giuliano Krättli, Radoslaw Michallik, and Heikki Suhonen are thanked for helping with sample preparations, Severi Juttula, Markus Metsälä, Christoph Beier, and Adam Abersteiner for helping with the analytical procedures, and Fabio Cafagna, James Connolly, and Sanni Turunen for discussions. The LA-ICP-MS data are contribution #1 from the Environmental and Mineralogical Laboratories (Hellabs) of the Department of Geosciences and Geography, University of Helsinki. The study was funded by the Academy of Finland Grants 295129 (J.S.H.), 306962 (V.J.V. and J.S.H.), and 327358 (V.J.V.). Open access funded by Helsinki University Library.

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