Fluids as primary carriers of sulphur and copper in magmatic assimilation

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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 , vol. 12 , no. 1 , 6609 . https://doi.org/10.1038/s41467-021-26969-3

Title: Fluids as primary carriers of sulphur and copper in magmatic assimilation
Alternative title: Fluidit rikin ja kuparin pääasiallisina kuljettajina magmaattisessa assimilaatiossa
Author: Virtanen, Ville J.; Heinonen, Jussi S.; Molnár, Ferenc; Schmidt, Max W.; Marxer, Felix; Skyttä, Pietari; Kueter, Nico; Moslova, Karina
Other contributor: University of Helsinki, Petrology and Geochemistry
University of Helsinki, Petrology and Geochemistry
University of Helsinki, Department of Chemistry



Date: 2021-11-16
Language: eng
Number of pages: 12
Belongs to series: Nature Communications
ISSN: 2041-1723
DOI: https://doi.org/10.1038/s41467-021-26969-3
URI: http://hdl.handle.net/10138/336510
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 ( Experiments show that when magma heats black shale wall-rock, fluids form and mobilize S and Cu, which can then concentrate and form base metal deposits. The fluids also attach to sulphide droplets and cause them to float in the host silicate melt.
Subject: 116 Chemical sciences
1171 Geosciences
CU-NI DEPOSIT
PARTRIDGE RIVER TROCTOLITE
COUNTRY ROCK INTERACTION
DULUTH-COMPLEX
SULFIDE MINERALIZATION
VIRGINIA FORMATION
OXYGEN FUGACITY
VOISEYS BAY
RE-OS
ISOTOPE
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