40Ar/39Ar constraints on the timing and origin of Miocene leucitite volcanism in southeastern Australia

Cohen, B. E., Knesel, K. M., Vasconcelos, P. M., Thiede, D. S. and Hergt, J. M. (2008) 40Ar/39Ar constraints on the timing and origin of Miocene leucitite volcanism in southeastern Australia. Australian Journal of Earth Sciences, 55 3: 407-418. doi:10.1080/08120090701769514


Author Cohen, B. E.
Knesel, K. M.
Vasconcelos, P. M.
Thiede, D. S.
Hergt, J. M.
Title 40Ar/39Ar constraints on the timing and origin of Miocene leucitite volcanism in southeastern Australia
Journal name Australian Journal of Earth Sciences   Check publisher's open access policy
ISSN 0812-0099
1440-0952
Publication date 2008-04
Sub-type Article (original research)
DOI 10.1080/08120090701769514
Volume 55
Issue 3
Start page 407
End page 418
Total pages 12
Editor A. E. Cockbain
Place of publication Oxford
Publisher Taylor & Francis
Collection year 2009
Language eng
Subject 260000 Earth Sciences
240000 Physical Sciences
Abstract Laser incremental-heating Ar-40/Ar-39 geochronology of seven leucitites from southeastern Australia indicates that leucite-bearing lavas in individual geographic clusters were erupted in one million years or less. The eruption ages range from 17.9 +/- 0.3 Ma (2 sigma) at El Capitan in northern-central New South Wales to 8.9 +/- 0.2 Ma (2 sigma) at Cosgrove in northern Victoria, The 40Ar/39Ar results demonstrate that the southward migration of leucite-bearing lavas was near-contemporaneous with age-progressive central-volcano magmatism in southeastern Australia. As such, the 40Ar/39Ar results are consistent with a hotspot-related origin for the leucitites. However, the question of whether single or multiple hotspots are required to explain these volcanic chains, which are separated by a distance of about 300 km, awaits a more complete geochronological picture of the onset, duration and migration of leucitite and central-volcano magmatism in eastern Australia.
Keyword argon-argon dating
Cenozoic
geochronology
hotspot
Intraplate volcanism
leucitite
Q-Index Code C1
Q-Index Status Confirmed Code

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Physical Sciences Publications
 
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Created: Mon, 04 Aug 2008, 15:10:46 EST by Laura McTaggart on behalf of School of Mathematics & Physics