Platinum-group elements and gold in sulfide melts from modern arc basalt (Tolbachik volcano, Kamchatka)

dc.contributor.authorZelenski, M.
dc.contributor.authorKamenetsky, V. S.
dc.contributor.authorMavrogenes, J. A.
dc.contributor.authorDanyushevsky, L. V.
dc.contributor.authorMatveev, D.
dc.contributor.authorGurenko, A. A.
dc.date.accessioned2018-01-09T03:57:46Z
dc.date.issued2017
dc.description.abstractSulfide melt inclusions entrapped in primitive olivine phenocrysts can be used to understand the compositions of early sulfide melts that may ultimately contribute to magmatic sulfide ore deposits. Sulfide globules hosted in olivine (86–92 mol% Fo) from the Tolbachik basalt (the 1941 eruption) are characterized in terms of their major and trace element abundances using electron microscopy and LA–ICP–MS analysis. Distribution of major elements within individual sulfide globules varies from homogeneous to heterogeneous. Phases include monosulfide solid solution (MSS) and intermediate solid solution (ISS) intergrowths and exsolved low-temperature minerals such as pyrrhotite, pentlandite, chalcopyrite and cubanite. Trace elements (platinum-group elements — PGE, Ag, Te, Au, Pb and Bi) are also present in solid solution in sulfide phases and as micron-sized particles (“nuggets”). Such nuggets of dominantly Au, Pt, Au–Pd and Pd–Te are contained randomly within sulfide matrices or, more commonly, at phase boundaries. Nuggets are also attached to outer surfaces of sulfide globules. Concentrations of PGE in sulfides follow a log normal distribution over four orders of magnitude. The highest measured noble metal concentrations in the analyzed globules (436 ppm Au + PGE) are 13.3 ppm Au, 115 ppm Pt and 299 ppm Pd, whereas 40% of globules have < 15 ppm of noble metals. Gold and PGE concentrations correlate, suggesting these elements were concentrated by the same process(es). We propose that a number of anomalous concentrations of one or several noble metals in the analyzed globules can be best explained by entrapment of Au–PGE-rich particles (solid or liquid) from the silicate melt. Although the individual Tolbachik sulfide globules have variable PGE abundances, their mean composition resembles those of major PGE-sulfide ore deposits (e.g., Norilsk, Sudbury, Platreef and Merensky Reef).en_AU
dc.description.sponsorshipThis study was supported by the Russian Science Foundation grant #16-17-10145en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0024-4937en_AU
dc.identifier.urihttp://hdl.handle.net/1885/139115
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0024-4937/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 9/01/18).
dc.publisherElsevieren_AU
dc.rights© 2017 Elsevier B.V.en_AU
dc.sourceLithosen_AU
dc.subjectSulfideen_AU
dc.subjectImmiscibilityen_AU
dc.subjectPlatinum-group metalsen_AU
dc.subjectChalcophile metalsen_AU
dc.subjectIsland-arc magmaen_AU
dc.subjectTolbachik volcanoen_AU
dc.titlePlatinum-group elements and gold in sulfide melts from modern arc basalt (Tolbachik volcano, Kamchatka)en_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.lastpage188en_AU
local.bibliographicCitation.startpage172en_AU
local.contributor.affiliationMavrogenes, J. A., Research School of Earth Sciences, The Australian National Universityen_AU
local.contributor.authoremailu9415694@anu.edu.auen_AU
local.contributor.authoruidu9415694en_AU
local.identifier.citationvolume290-291en_AU
local.identifier.doi10.1016/j.lithos.2017.08.012en_AU
local.identifier.uidSubmittedByu1005913en_AU
local.publisher.urlhttps://www.elsevier.com/en_AU
local.type.statusAccepted Versionen_AU

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