Show simple item record

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. <sup>40</sup>Ar/<sup>39</sup>Ar 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.title<sup>40</sup>Ar/<sup>39</sup>Ar 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


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record