期刊
JOURNAL OF THE GEOLOGICAL SOCIETY
卷 161, 期 -, 页码 547-550出版社
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/0016-764903-181
关键词
lemombo rhyolites; U-pb; flood basalts; rhyolites; Karoo
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 40Ar/39Ar 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.
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