期刊
AUSTRALIAN JOURNAL OF EARTH SCIENCES
卷 55, 期 3, 页码 407-418出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/08120090701769514
关键词
argon-argon dating; Cenozoic; geochronology; hotspot; Intraplate volcanism; leucitite
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 (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.
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