Divergent Fe and S mineralization pathways during the oxidative transformation of greigite, Fe3S4

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dc.contributor.authorMoon, EMen_AU
dc.contributor.authorBush, RTen_AU
dc.contributor.authorGibbs, DHMen_AU
dc.contributor.authorMata, JPen_AU
dc.date.accessioned2023-11-16T21:32:56Zen_AU
dc.date.available2023-11-16T21:32:56Zen_AU
dc.date.issued2017-09-30en_AU
dc.date.statistics2023-11-14en_AU
dc.description.abstractThe iron sulfide mineral greigite, Fe3S4, has previously been identified in the surface layers of the intertidal zone of a partially remediated acid sulfate soil wetland, representing an end-member in an iron sulfide mineralization pathway distinct from that of pyrite. The persistence of greigite is important for the stability of the remediated landscape, but the response of greigite to periods of oxygenation (for example, during a neap tide) is poorly understood. In this study, we employ X-ray absorption spectroscopy to identify the Fe and S speciation and mineralogy resulting from the oxidative disintegration of synthetic greigite under physiochemical solution conditions consistent with a partially remediated acid sulfate soil wetland. Results indicate divergent Fe and S mineralization pathways culminating in elemental sulfur and iron (hyr)oxide minerals. No sulfate-containing minerals were identified, and under all conditions tested, residual greigite remains. The oxidation products, and the presence of sulfur reducing bacteria, provide the right chemical environment for the reformation of greigite during the sub-oxic conditions of the rest of the tidal cycle. This likely explains the persistence of greigite in the intertidal zone, and implies that the oxidation of greigite is not detrimental to the long term stability of the acid sulfate soil remediation process. © 2017 Elsevier B.V.en_AU
dc.description.sponsorshipE.M., R.B. and D.G. were supported by CRC CARE Project No 4.1.16. Iron and sulfur XAS was conducted at the National Synchrotron Radiation Research Centre (NSRRC) in Taiwan and we thank the beamline scientists of beamlines 17C and 16A, including Dr. J.-.F Lee and Dr. L.-Y. Jang, for assistance and advice with collection of XAS data. TEM data were collected at the Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation (ANSTO). We thank Dr. Mark Blackford and Dr. Greg Lumpkin of ANSTO for helpful discussions and assistance with data acquisition. Use of the TEM was funded from a seed grant provided by Southern Cross University. We thank Tiffany Collins for assisting with the pilot study that preceded this investigation.en_AU
dc.identifier.citationMoon, E. M., Bush, R. T., Gibbs, D. H. M., & Mata, J. P. (2017). Divergent Fe and S mineralization pathways during the oxidative transformation of greigite, Fe3S4. Chemical Geology, 468, 42-48. doi:10.1016/j.chemgeo.2017.08.007en_AU
dc.identifier.issn0009-2541en_AU
dc.identifier.journaltitleChemical Geologyen_AU
dc.identifier.pagination42-48en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15191en_AU
dc.identifier.volume468en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.relation.urihttps://doi.org/10.1016/j.chemgeo.2017.08.007en_AU
dc.subjectOxidationen_AU
dc.subjectAcid soilsen_AU
dc.subjectSulfatesen_AU
dc.subjectIronen_AU
dc.subjectMineralizationen_AU
dc.subjectWetlandsen_AU
dc.subjectX-ray Spectroscopyen_AU
dc.subjectRemedial actionen_AU
dc.titleDivergent Fe and S mineralization pathways during the oxidative transformation of greigite, Fe3S4en_AU
dc.typeJournal Articleen_AU
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