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40Ar/39Ar constraints on the timing and origin of Miocene leucitite volcanism in southeastern Australia.
- Source :
- Australian Journal of Earth Sciences; Apr2008, Vol. 55 Issue 3, p407-418, 12p, 1 Diagram, 4 Charts, 4 Graphs, 1 Map
- Publication Year :
- 2008
-
Abstract
- Laser incremental-heating 40Ar/39Ar 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 (2σ) at El Capitan in northern-central New South Wales to 8.9 ± 0.2 Ma (2σ) 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- GEOLOGICAL time scales
VOLCANOES
LAVA
VOLCANISM
MAGMATISM
HISTORICAL geology
Subjects
Details
- Language :
- English
- ISSN :
- 08120099
- Volume :
- 55
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Australian Journal of Earth Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 31226333
- Full Text :
- https://doi.org/10.1080/08120090701769514