Oxidation state of subarc mantle
The subarc mantle is a primary control on the composition of arc magmas and the formation of arc-related ore deposits. Elevated ferric iron contents in arc lavas have been interpreted as a record of subarc mantle that is oxidized relative to mid-oceanic ridge basalt (MORB), but this conclusion is co...
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| Format: | Journal Article |
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Geological Society of America
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/4062 |
| _version_ | 1848744409021022208 |
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| author | Evans, Katy Elburg, M. Kamenetsky, V. |
| author_facet | Evans, Katy Elburg, M. Kamenetsky, V. |
| author_sort | Evans, Katy |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The subarc mantle is a primary control on the composition of arc magmas and the formation of arc-related ore deposits. Elevated ferric iron contents in arc lavas have been interpreted as a record of subarc mantle that is oxidized relative to mid-oceanic ridge basalt (MORB), but this conclusion is controversial. Measurements of spinel compositions in primitive arc lavas imply an arc magma source 1–4 log units more oxidized than MORB and ocean island basalts analyzed using the same technique. Samples from seven arcs show a significant correlation (P < 0.0005) between redox budget, subduction zone convergence rate, and subduction zone age. These results support the notion of oxidized arc lavas in the mantle source zone, but resolution of contradictory evidence regarding subarc mantle redox state requires further work. |
| first_indexed | 2025-11-14T06:01:00Z |
| format | Journal Article |
| id | curtin-20.500.11937-4062 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:01:00Z |
| publishDate | 2012 |
| publisher | Geological Society of America |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-40622017-09-13T16:01:42Z Oxidation state of subarc mantle Evans, Katy Elburg, M. Kamenetsky, V. oxybarometry redox cycling spinel subduction The subarc mantle is a primary control on the composition of arc magmas and the formation of arc-related ore deposits. Elevated ferric iron contents in arc lavas have been interpreted as a record of subarc mantle that is oxidized relative to mid-oceanic ridge basalt (MORB), but this conclusion is controversial. Measurements of spinel compositions in primitive arc lavas imply an arc magma source 1–4 log units more oxidized than MORB and ocean island basalts analyzed using the same technique. Samples from seven arcs show a significant correlation (P < 0.0005) between redox budget, subduction zone convergence rate, and subduction zone age. These results support the notion of oxidized arc lavas in the mantle source zone, but resolution of contradictory evidence regarding subarc mantle redox state requires further work. 2012 Journal Article http://hdl.handle.net/20.500.11937/4062 10.1130/G33037.1 Geological Society of America restricted |
| spellingShingle | oxybarometry redox cycling spinel subduction Evans, Katy Elburg, M. Kamenetsky, V. Oxidation state of subarc mantle |
| title | Oxidation state of subarc mantle |
| title_full | Oxidation state of subarc mantle |
| title_fullStr | Oxidation state of subarc mantle |
| title_full_unstemmed | Oxidation state of subarc mantle |
| title_short | Oxidation state of subarc mantle |
| title_sort | oxidation state of subarc mantle |
| topic | oxybarometry redox cycling spinel subduction |
| url | http://hdl.handle.net/20.500.11937/4062 |