U-Pb zircon (SHRIMP) ages for the Lebombo rhyolites, South Africa: refining the duration of Karoo volcanism
Riley, T.R. ORCID: https://orcid.org/0000-0002-3333-5021; Millar, I.L.; Watkeys, M.K.; Curtis, M.L.; Leat, P.T.; Klausen, M.B.; Fanning, C.M.. 2004 U-Pb zircon (SHRIMP) ages for the Lebombo rhyolites, South Africa: refining the duration of Karoo volcanism. Journal of the Geological Society, 161 (4). 547-550. 10.1144/0016-764903-181
Full text not available from this repository. (Request a copy)Abstract/Summary
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 Sabie 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 Ar-40/Ar-39 geochronology, the new SHRIMP data fine-tunes the chronology of the Karoo volcanic province and indicates the 12 km succession of volcanic rocks in the Lebombo rift were erupted in 1-2 million years and lends considerable support to the links between the Pleinsbachian-Toarcian extinction event and the global environmental impact of Karoo volcanism.
Item Type: | Publication - Article |
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Digital Object Identifier (DOI): | 10.1144/0016-764903-181 |
Programmes: | BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Antarctica in the Dynamic Global Plate System |
ISSN: | 0016-7649 |
Additional Keywords: | Lemombo rhyolites, U-pb, flood basalts, rhyolites, Karoo |
NORA Subject Terms: | Earth Sciences |
Date made live: | 25 Jan 2012 09:59 +0 (UTC) |
URI: | https://nora.nerc.ac.uk/id/eprint/12380 |
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