Fluids as primary carriers of sulphur and copper in magmatic assimilation.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
16 Nov 2021
16 Nov 2021
Historique:
received:
11
02
2020
accepted:
22
10
2021
entrez:
17
11
2021
pubmed:
18
11
2021
medline:
18
11
2021
Statut:
epublish
Résumé
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.
Identifiants
pubmed: 34785681
doi: 10.1038/s41467-021-26969-3
pii: 10.1038/s41467-021-26969-3
pmc: PMC8595724
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
6609Subventions
Organisme : Academy of Finland (Suomen Akatemia)
ID : 306962
Organisme : Academy of Finland (Suomen Akatemia)
ID : 327358
Organisme : Academy of Finland (Suomen Akatemia)
ID : 295129
Organisme : Academy of Finland (Suomen Akatemia)
ID : 306962
Informations de copyright
© 2021. The Author(s).
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