40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia
dc.contributor.author | Oostingh, K. | |
dc.contributor.author | Jourdan, Fred | |
dc.contributor.author | Matchan, E. | |
dc.contributor.author | Phillips, D. | |
dc.date.accessioned | 2017-04-28T13:59:32Z | |
dc.date.available | 2017-04-28T13:59:32Z | |
dc.date.created | 2017-04-28T09:06:03Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Oostingh, K. and Jourdan, F. and Matchan, E. and Phillips, D. 2017. 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia. Geochemistry, Geophysics, Geosystems. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/52670 | |
dc.identifier.doi | 10.1002/2016GC006601 | |
dc.description.abstract |
© 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. | |
dc.publisher | Wiley-Blackwell Publishing | |
dc.title | 40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia | |
dc.type | Journal Article | |
dcterms.source.issn | 1525-2027 | |
dcterms.source.title | Geochemistry, Geophysics, Geosystems | |
curtin.department | Department of Applied Geology | |
curtin.accessStatus | Fulltext not available |
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