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U-Pb zircon (SHRIMP) ages for the Lebombo rhyolites, South Africa: refining the duration of Karoo volcanism

Riley, Thomas; Millar, Ian L; Watkeys, M K; Curtis, Michael L; Leat, P T; Klausen, M B; Fanning, Christopher


U-Pb SHRIMP ages are reported for three rhyolite flows from the Lebombo rift region of the Karoo volcanic province. Two flows are interbedded with the Sabic River Basalt Formation and a third sample is from the overlying rhyolitic Jozini Formation. The interbedded rhyolites yield ages of 182.0 ± 2.1 and 179.9 ± 1.8 Ma, whilst the overlying Jozini Formation rhyolite yields an age of 182.1 ± 2.9 Ma. Combined with existing 40Ar/39 Ar geochronology, the new SHRIMP data fine-tunes the chronology of...[Show more]

CollectionsANU Research Publications
Date published: 2004
Type: Journal article
Source: Journal of the Geological Society
DOI: 10.1144/0016-764903-181


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