- Title
- Stable sulfur isotope dynamics in an acid sulfate soil landscape following seawater inundation
- Creator
- Maher, Crystal; Sullivan, Leigh
- Date
- 2016
- Type
- Text; Journal article
- Identifier
- http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/154423
- Identifier
- vital:11146
- Identifier
-
https://doi.org/10.1016/j.chemgeo.2016.07.001
- Identifier
- ISSN:0009-2541
- Abstract
- In 2002 a tidally driven seawater exchange remediation strategy was successfully implemented on a severely acidified tropical coastal landscape dominated by acid sulfate soils (ASS) in northern Australia. This study examined changes in the stable sulfur isotope signatures in a range of sulfide and sulfate (SO4) fractions at three sites with different levels of exposure to the tidally driven seawater exchange remediation. delta S-34 in the acid soluble SO4 fraction (e.g. jarosite) was less depleted in S-34 than the corresponding sulfide, indicating a degree of fractionation during sulfide oxidation and jarosite precipitation. The delta S-34 ofjarositic-SO4 was similar at all three sites indicating the appreciable stability of jarositic-SO4 even after extended exposure to seawater. delta S-34 of the water soluble, exchangeable and schwertmannitic-SO4 reflect conditions post remediation and indicate the relative contributions from two potential SO4 sources - a lighter SO4 derived from the oxidation of pyrite, and a heavier SO4 derived from the seawater. The delta S-34 of the contemporary surficial sulfide accumulations also reflect a SO4 contribution from seawater used for remediation and were isotopically different from the relict sulfides found at depth at all sites. delta S-34 of water soluble sulfate allowed the progress of the remediation to be traced down the soil profile. This study demonstrates the utility of stable sulfur isotope signatures in various sulfide and SO4 fractions to trace the sulfur geochemical pathways occurring in soils, in this case as a result of the introduction of tidally driven sea water. (C) 2016 Elsevier B.V. All rights reserved.
- Publisher
- Elsevier Ltd
- Relation
- Chemical Geology Vol. 439, no. (2016), p. 205-212
- Rights
- Copyright © 2016 Elsevier B.V. All rights reserved.
- Rights
- This metadata is freely available under a CCO license
- Subject
- 0402 Geochemistry; 0403 Geology; 0406 Physical Geography and Environmental Geoscience; Isotope geochemistry; Tidal exchange; Jarosite; Pyrite oxidation
- Reviewed
- Hits: 717
- Visitors: 622
- Downloads: 1
| Thumbnail | File | Description | Size | Format |
|---|