Journal article
40Ar/39Ar ages of alkali feldspar xenocrysts constrain the timing of intraplate basaltic volcanism
EL Matchan, D Phillips, E Traine, D Zhu
Quaternary Geochronology | ELSEVIER SCI LTD | Published : 2018
Abstract
Intraplate continental basaltic volcanic provinces (ICBVPs) occur on all continents and represent some of the most enigmatic volcanic systems. Constraints on the origin(s) and evolution of ICBVPs are predicated on detailed knowledge of eruption histories, which are often poorly quantified. Although the 40Ar/39Ar geochronology method has been applied successfully to lava flows, age determinations on scoria cones and maars are more challenging. In this study, we test the potential of entrained anorthoclase megacrysts to yield accurate 40Ar/39Ar ages for scoria cones and maars from the Pliocene-Holocene Newer Volcanic Province (NVP) of south-eastern Australia. The NVP is an ICBVP containing >40..
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Grants
Awarded by Australian Research Council
Funding Acknowledgements
This work was supported by ARC grant DP130100517. William (Bill) Birch and Dermot Henry from the Melbourne Museum are thanked for providing access to the Museum Victoria mineral collection and supplying the majority of the feldspar megacrysts used in this study. Graham Hutchinson is acknowledged for undertaking the electron microprobe analyses, Stan Szczepanski for technical assistance in the Noble Gas Geochronology Laboratory, and Korien Oostingh and Fred Jourdan (Curtin University) for discussion on Mount Shadwell and Mount Leura basalt ages. The manuscript has benefitted from thoughtful reviews by Brian Jicha, an anonymous reviewer and the editor, Sebastien Nomade.