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dc.contributor.authorNielsen, Sune G.
Shimizu, Nobumichi
Lee, Cin-Ty A.
Behn, Mark D.
dc.date.accessioned 2016-01-28T18:32:41Z
dc.date.available 2016-01-28T18:32:41Z
dc.date.issued 2014
dc.identifier.citation Nielsen, Sune G., Shimizu, Nobumichi, Lee, Cin-Ty A., et al.. "Chalcophile behavior of thallium during MORB melting and implications for the sulfur content of the mantle." Geochemistry, Geophysics, Geosystems, 15, no. 12 (2014) American Geophysical Union: 4905-4919. http://dx.doi.org/10.1002/2014GC005536.
dc.identifier.urihttps://hdl.handle.net/1911/88231
dc.description.abstract We present new laser ablation ICP-MS trace element concentration data for 28 elements in 97 mid-ocean ridge basalt (MORB) glasses that cover all major spreading centers as well as Tl concentration data for all mineral phases in five lherzolites from the Lherz massif, France. The ratio between the elements thallium (Tl) and cerium (Ce) is nearly constant in MORB, providing evidence that the depleted MORB mantle (DMM) has uniform Ce/Tl. Lherzolite mineral data reveal that sulfides are heterogeneous and contain between 23 and 430 ng/g of Tl while all other minerals contain Tl below the analytical detection limit of ∼1 ng/g. We argue that Tl in MORB is controlled by residual sulfide during mantle melting. To investigate the observed relationship between Tl and Ce, we conduct models of fractional mantle melting, which show that the constant Ce/Tl in MORB is only reproduced if the ratio between clinopyroxene and sulfide in the upper mantle varies by less than 10%. In addition, the rate of melting for these two phases must be nearly identical as otherwise melt depletion and refertilization processes would lead to Ce/Tl fractionation. These model results allow us to establish a relationship for the sulfur content of DMM: [S]DMM = SCSS × Mcpx /Rcpx, where SCSS is the sulfur concentration of a silicate melt at sulfide saturation, Rcpx is the melt reaction coefficient, and Mcpx is the modal abundance of clinopyroxene in the DMM. Using this equation, we calculate that the average upper mantle sulfur concentration is 195 ± 45 μg/g.
dc.language.iso eng
dc.publisher American Geophysical Union
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title Chalcophile behavior of thallium during MORB melting and implications for the sulfur content of the mantle
dc.type Journal article
dc.contributor.funder National Science Foundation
dc.citation.journalTitle Geochemistry, Geophysics, Geosystems
dc.subject.keywordthallium
sulfide
mantle
trace elements
dc.citation.volumeNumber 15
dc.citation.issueNumber 12
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1002/2014GC005536
dc.identifier.grantID EAR 1119373 (National Science Foundation)
dc.type.publication publisher version
dc.citation.firstpage 4905
dc.citation.lastpage 4919


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