40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia
© 2017. American Geophysical Union. All Rights Reserved.Here we present 40Ar/39Ar ages of volcanic features in the Cenozoic intraplate Newer Volcanic Province in southeast Australia. The <5 Ma volcanic products in the Newer Volcanic Province can be subdivided into tholeiitic, valley-filling N...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/52670 |
| _version_ | 1848758982982762496 |
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| author | Oostingh, K. Jourdan, Fred Matchan, E. Phillips, D. |
| author_facet | Oostingh, K. Jourdan, Fred Matchan, E. Phillips, D. |
| author_sort | Oostingh, K. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2017. American Geophysical Union. All Rights Reserved.Here we present 40Ar/39Ar ages of volcanic features in the Cenozoic intraplate Newer Volcanic Province in southeast Australia. The <5 Ma volcanic products in the Newer Volcanic Province can be subdivided into tholeiitic, valley-filling Newer Plains basalts, and alkaline scoria cones, lava shields, and maars of the Newer Cones series. Plateau ages range from 3.76±0.01 to 4.32±0.03 Ma (2s; all sources of uncertainties included) for the Newer Plains series, with production rates of volcanism decreasing post 4 Ma. We suggest that magmatism is related to the complex interplay of magma upwelling due to edge-driven convection and the Cosgrove track mantle plume located in the northeast of the province at 6.5-5 Ma. Plateau ages range from 1290±20 to 41.1±2.2 ka (2s) for the Newer Cones series, with a diffuse age progression in the onset of volcanism for these features from east to west. Analyses of the distribution and geomorphology of these volcanic features indicates a strong control of basement faults on volcanism, reflected in alignment of volcanic features along Paleozoic north-south oriented basement faults in the east and Cretaceous northwest-southeast oriented extensional features in the west. This age progression can be explained by a westerly migration of stress derived from the left-lateral strike-slip Tasman Fracture Zone. This suggests that the general mechanism of volcanism changed from upwelling due to plume-assisted edge-driven convection prior to ~4 Ma to stress-dependent upwelling at around 1.3 Ma. |
| first_indexed | 2025-11-14T09:52:39Z |
| format | Journal Article |
| id | curtin-20.500.11937-52670 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:52:39Z |
| publishDate | 2017 |
| publisher | Wiley-Blackwell Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-526702023-08-02T06:39:09Z 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia Oostingh, K. Jourdan, Fred Matchan, E. Phillips, D. © 2017. American Geophysical Union. All Rights Reserved.Here we present 40Ar/39Ar ages of volcanic features in the Cenozoic intraplate Newer Volcanic Province in southeast Australia. The <5 Ma volcanic products in the Newer Volcanic Province can be subdivided into tholeiitic, valley-filling Newer Plains basalts, and alkaline scoria cones, lava shields, and maars of the Newer Cones series. Plateau ages range from 3.76±0.01 to 4.32±0.03 Ma (2s; all sources of uncertainties included) for the Newer Plains series, with production rates of volcanism decreasing post 4 Ma. We suggest that magmatism is related to the complex interplay of magma upwelling due to edge-driven convection and the Cosgrove track mantle plume located in the northeast of the province at 6.5-5 Ma. Plateau ages range from 1290±20 to 41.1±2.2 ka (2s) for the Newer Cones series, with a diffuse age progression in the onset of volcanism for these features from east to west. Analyses of the distribution and geomorphology of these volcanic features indicates a strong control of basement faults on volcanism, reflected in alignment of volcanic features along Paleozoic north-south oriented basement faults in the east and Cretaceous northwest-southeast oriented extensional features in the west. This age progression can be explained by a westerly migration of stress derived from the left-lateral strike-slip Tasman Fracture Zone. This suggests that the general mechanism of volcanism changed from upwelling due to plume-assisted edge-driven convection prior to ~4 Ma to stress-dependent upwelling at around 1.3 Ma. 2017 Journal Article http://hdl.handle.net/20.500.11937/52670 10.1002/2016GC006601 Wiley-Blackwell Publishing restricted |
| spellingShingle | Oostingh, K. Jourdan, Fred Matchan, E. Phillips, D. 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia |
| title | 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia |
| title_full | 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia |
| title_fullStr | 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia |
| title_full_unstemmed | 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia |
| title_short | 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia |
| title_sort | 40ar/39ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the newer volcanic province, se australia |
| url | http://hdl.handle.net/20.500.11937/52670 |