Chalcophile behavior of thallium during <scp>MORB</scp> melting and implications for the sulfur content of the mantle

Nielsen, Sune G.; Shimizu, Nobumichi; Lee, Cin-Ty A.; Behn, M. D.

doi:10.1002/2014gc005536

Cited by 53 publications

(62 citation statements)

References 72 publications

(157 reference statements)

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“…McGoldrick et al (1979) suggests that Tl displays chalcophile behavior and follows sulphur in sulphur-saturated magmas. However, study of sulphur-rich ore deposits (Baker et al 2010) Most recently, Nielsen et al (2014) have shown that the only phase housing significant Tl in the lherz massif are interstitial sulphides, which yielded variable concentrations from 23 to 430 ng/g. Noll et al (1996) assumed that Tl behaved as a chalcophile element and used chalcophile/lithophile element ratios in subductionrelated lavas to determine relative fluid mobility of trace elements.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The crystallising assemblage includes plagioclase, clinopyroxene, olivine, orthopyroxene and titanomagnetite (Woodhead, 1988, Pallister et al, 2005de Moor et al, 2005), none of which are expected to incorporate Tl (e.g., Nielsen et al 2014;2016). Thin section investigation of prehistoric lavas reveal minimal to negligible alteration (Woodhead, 1988).…”

Section: Anatahan: Geologic and Geochemical Backgroundmentioning

confidence: 99%

“…McGoldrick et al (1979) suggested that Tl behaves as a chalcophile element, following sulphur in sulphur-saturated magma. Nielsen et al (2014) have recently provided evidence that, during mantle melting to create MORB, Tl is associated predominantly with sulphides and thus they also infer chalcophile behavior.…”

Section: Thallium Elemental Behavior During Magmatic Processesmentioning

confidence: 99%

“…Thus large, self-consistent databases (Jenner and O'Niell, 2012;Jenner et al, 2015;Nielsen et al, 2014) are used as a guide. The goal is to find an element that is not fractionated from Tl during partial melting and differentiation and thus can be used in conjunction with Tl isotopes to evaluate inputs to the source of mantle-derived melts.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Finally, since Nielsen et al (2014) demonstrate that Pb/Tl ratios are more restricted than Cs/Tl ratios in their MORB database, we also examine Pb/Tl versus Tl concentration (Fig. 6c).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Thallium elemental behavior and stable isotope fractionation during magmatic processes

et al. 2017

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Please cite this article as: Prytulak, J., Brett, A., Webb, M., Plank, T., Rehkämper, M., Savage, P.S., Woodhead, J., Thallium elemental behavior and stable isotope fractionation during magmatic processes, Chemical Geology (2016), doi: 10.1016/j.chemgeo. 2016.11.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractStable thallium (Tl) isotopes are an extremely sensitive tracer for the addition of small amounts of sediments or materials altered at low temperatures to the source(s) of mantle-derived melts. The ability of Tl to trace such materials is due to the large concentration contrast between the mantle (Tl < 2ng/g) and possible exotic inputs (Tl ~100ng/g to >g/g), which also often display fractionated Tl isotope compositions.However, the magnitude of Tl isotope fractionation induced by igneous processes alone has not been systematically assessed. Here, two suites of co-genetic magmas, spanning a large range of differentiation, from Hekla, Iceland, and Anatahan, in the Mariana arc, are used to assess the behavior of thallium and its stable isotope variations during magmatic processes. Thallium behaves as a near-perfectly incompatible lithophile element throughout magmatic evolution, mirroring elements such as Rb, Cs, and K. Lavas from Hekla have restricted Cs/Tl ratios and stable Tl isotope compositions, which overlap with mantle estimates. Lavas from subductionrelated Anatahan volcano also have a restricted range in Tl isotope composition, which overlaps with Hekla and MORB, demonstrating that fractional crystallisation and partial melting does not fractionate stable Tl isotopes. Subduction environments display variable Cs/Tl, indicating that the subduction process commonly fractionates these two elements. The immunity of thallium stable isotopes to fractionation by magmatic processes coupled with its extreme sensitivity for tracing pelagic sediments, FeMn crusts and low temperature altered oceanic crust highlight its value in elucidating the nature of mantle sources of both oceanic basalts and arc lavas.Critically, meaningful interpretation of thallium isotope compositions need not be restricted to primitive lavas.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Anatahan: Geologic and Geochemical Backgroundmentioning

confidence: 99%

Section: Thallium Elemental Behavior During Magmatic Processesmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…Finally, since Nielsen et al (2014) demonstrate that Pb/Tl ratios are more restricted than Cs/Tl ratios in their MORB database, we also examine Pb/Tl versus Tl concentration (Fig. 6c).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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