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dc.contributor.authorOostingh, K.
dc.contributor.authorJourdan, Fred
dc.contributor.authorMatchan, E.
dc.contributor.authorPhillips, D.
dc.date.accessioned2017-04-28T13:59:32Z
dc.date.available2017-04-28T13:59:32Z
dc.date.created2017-04-28T09:06:03Z
dc.date.issued2017
dc.identifier.citationOostingh, 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.urihttp://hdl.handle.net/20.500.11937/52670
dc.identifier.doi10.1002/2016GC006601
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.publisherWiley-Blackwell Publishing
dc.title40Ar/39Ar geochronology reveals rapid change from plume-assisted to stress-dependent volcanism in the Newer Volcanic Province, SE Australia
dc.typeJournal Article
dcterms.source.issn1525-2027
dcterms.source.titleGeochemistry, Geophysics, Geosystems
curtin.departmentDepartment of Applied Geology
curtin.accessStatusFulltext not available


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