A model for Cryogenian iron formation
The Neoproterozoic Tatonduk (Alaska) and Holowilena (South Australia) iron formations share many characteristics including their broadly coeval (Sturtian) ages, intimate association with glaciogenic sediments, and mineralogy. We show that these shared characteristics extend to their neodymium (εNdεN...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier BV
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/47094 |
| _version_ | 1848757740175884288 |
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| author | Cox, Grant Halverson, Galen Poirier, A. Heron, D. Strauss, J. Stevenson, R. |
| author_facet | Cox, Grant Halverson, Galen Poirier, A. Heron, D. Strauss, J. Stevenson, R. |
| author_sort | Cox, Grant |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The Neoproterozoic Tatonduk (Alaska) and Holowilena (South Australia) iron formations share many characteristics including their broadly coeval (Sturtian) ages, intimate association with glaciogenic sediments, and mineralogy. We show that these shared characteristics extend to their neodymium (εNdεNd) and iron isotope (δ56Fe) systematics. In both regions δ56Fe values display a distinct up-section trend to isotopically heavier values, while εNd values are primitive and similar to non-ferruginous mudstones within these successions. The δ56Fe profiles are consistent with oxidation of ferruginous waters during marine transgression, and the εNd values imply that much of this iron was sourced from the leaching of continental margin sediments largely derived from continental flood basalts. Rare earth element data indicate a secondary hydrothermal source for this iron. |
| first_indexed | 2025-11-14T09:32:53Z |
| format | Journal Article |
| id | curtin-20.500.11937-47094 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:32:53Z |
| publishDate | 2016 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-470942017-09-13T14:28:07Z A model for Cryogenian iron formation Cox, Grant Halverson, Galen Poirier, A. Heron, D. Strauss, J. Stevenson, R. The Neoproterozoic Tatonduk (Alaska) and Holowilena (South Australia) iron formations share many characteristics including their broadly coeval (Sturtian) ages, intimate association with glaciogenic sediments, and mineralogy. We show that these shared characteristics extend to their neodymium (εNdεNd) and iron isotope (δ56Fe) systematics. In both regions δ56Fe values display a distinct up-section trend to isotopically heavier values, while εNd values are primitive and similar to non-ferruginous mudstones within these successions. The δ56Fe profiles are consistent with oxidation of ferruginous waters during marine transgression, and the εNd values imply that much of this iron was sourced from the leaching of continental margin sediments largely derived from continental flood basalts. Rare earth element data indicate a secondary hydrothermal source for this iron. 2016 Journal Article http://hdl.handle.net/20.500.11937/47094 10.1016/j.epsl.2015.11.003 Elsevier BV restricted |
| spellingShingle | Cox, Grant Halverson, Galen Poirier, A. Heron, D. Strauss, J. Stevenson, R. A model for Cryogenian iron formation |
| title | A model for Cryogenian iron formation |
| title_full | A model for Cryogenian iron formation |
| title_fullStr | A model for Cryogenian iron formation |
| title_full_unstemmed | A model for Cryogenian iron formation |
| title_short | A model for Cryogenian iron formation |
| title_sort | model for cryogenian iron formation |
| url | http://hdl.handle.net/20.500.11937/47094 |