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dc.contributor.authorHammerli, J.
dc.contributor.authorKemp, A.
dc.contributor.authorBarrett, N.
dc.contributor.authorWing, B.
dc.contributor.authorRoberts, M.
dc.contributor.authorArculus, R.
dc.contributor.authorBoivin, P.
dc.contributor.authorNude, P.
dc.contributor.authorRankenburg, Kai
dc.identifier.citationHammerli, J. and Kemp, A. and Barrett, N. and Wing, B. and Roberts, M. and Arculus, R. and Boivin, P. et al. 2017. Sulfur isotope signatures in the lower crust: A SIMS study on S-rich scapolite of granulites. Chemical Geology. 454: pp. 54-66.

© 2017 Elsevier B.V. Scapolite is an important reservoir for volatiles in the deep crust and provides unique insights into the S isotope signatures at the mantle/crust interface. Here we document the first scapolite reference material (herein referred to as CB1) for in situ S isotope analysis. The chemical and isotopic composition of this euhedral, S-rich scapolite megacryst was characterized via LA-ICP-MS, EPMA, SIMS, and bulk fluorination gas source isotope ratio mass spectrometry. The CB1 scapolite is isotopically homogeneous and our results show that crystal orientation does not affect in situ S isotope SIMS analysis. This makes CB1 an ideal primary calibration standard for in situ analysis of S isotope ratios (36S/32S,34S/32S and33S/32S) in scapolite. With this reference material in hand, we then applied in situ SIMS analysis of S isotopes for the first time on scapolite in granulite samples from the lower crust/upper mantle. The analysed sample suite comprises rocks from classic granulite xenolith locations in southeastern Australia, as well as a sample from the high-grade suture zone of the Dahomeyides in south-eastern Ghana. The results show that scapolites in the lower crust have d34S values between ~- 0.5 and + 4 (‰ VCDT). These values fall within the range of S isotope signatures present in mantle rocks and provide no evidence for the recycling of seawater-derived S into the lower crust. We propose that scapolite formed during granulite facies metamorphism of igneous cumulates, where S was sourced from precursor igneous sulfides. Sulfur isotope heterogeneities between individual scapolite grains in some of the studied samples may reflect non-uniform S-isotope compositions of igneous S-phases, which precipitated from mantle-derived melt.

dc.publisherElsevier Science BV
dc.titleSulfur isotope signatures in the lower crust: A SIMS study on S-rich scapolite of granulites
dc.typeJournal Article
dcterms.source.titleChemical Geology
curtin.departmentJohn de Laeter Centre
curtin.accessStatusFulltext not available

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