{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T07:45:20Z","timestamp":1775029520071,"version":"3.50.1"},"reference-count":18,"publisher":"Geological Society of London","issue":"4","license":[{"start":{"date-parts":[[2004,7,1]],"date-time":"2004-07-01T00:00:00Z","timestamp":1088640000000},"content-version":"stm-asf","delay-in-days":0,"URL":"https:\/\/doi.org\/10.15223\/policy-002"}],"content-domain":{"domain":["www.lyellcollection.org"],"crossmark-restriction":true},"short-container-title":["JGS"],"published-print":{"date-parts":[[2004,7]]},"abstract":"<jats:p>\n            U\u2013Pb 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 \u00b1 2.1 and 179.9 \u00b1 1.8 Ma, whilst the overlying Jozini Formation rhyolite yields an age of 182.1 \u00b1 2.9 Ma. Combined with existing\n            <jats:sup>40<\/jats:sup>\n            Ar\/\n            <jats:sup>39<\/jats:sup>\n            Ar 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\u20132 million years and lends considerable support to the links between the Pleinsbachian\u2013Toarcian extinction event and the global environmental impact of Karoo volcanism.\n          <\/jats:p>","DOI":"10.1144\/0016-764903-181","type":"journal-article","created":{"date-parts":[[2007,12,21]],"date-time":"2007-12-21T18:15:25Z","timestamp":1198260925000},"page":"547-550","update-policy":"https:\/\/doi.org\/10.1144\/crossmark-policy","source":"Crossref","is-referenced-by-count":73,"title":["U\u2013Pb zircon (SHRIMP) ages for the Lebombo rhyolites, South Africa: refining the duration of Karoo volcanism"],"prefix":"10.1144","volume":"161","author":[{"given":"T.R.","family":"RILEY","sequence":"first","affiliation":[{"name":"1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (e-mail: t.riley@bas.ac.uk)"}]},{"given":"I.L.","family":"MILLAR","sequence":"additional","affiliation":[{"name":"2British Antarctic Survey c\/o NERC Isotope Geosciences Laboratory, Keyworth, Nottingham, NG12 5GG, UK"}]},{"given":"M.K.","family":"WATKEYS","sequence":"additional","affiliation":[{"name":"3School of Geological and Computer Sciences, University of Natal, Durban 4041, South Africa"}]},{"given":"M.L.","family":"CURTIS","sequence":"additional","affiliation":[{"name":"1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (e-mail: t.riley@bas.ac.uk)"}]},{"given":"P.T.","family":"LEAT","sequence":"additional","affiliation":[{"name":"1British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK (e-mail: t.riley@bas.ac.uk)"}]},{"given":"M.B.","family":"KLAUSEN","sequence":"additional","affiliation":[{"name":"3School of Geological and Computer Sciences, University of Natal, Durban 4041, South Africa"}]},{"given":"C.M.","family":"FANNING","sequence":"additional","affiliation":[{"name":"4PRISE, Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, A.C.T. 0200, Australia"}]}],"member":"1881","published-online":{"date-parts":[[2022,6,6]]},"reference":[{"key":"e_1_3_2_1_1","unstructured":"Allsopp H.L. Manton W.I. Bristow J.W. & Erlank A.J. 1984. Rb\u2013Sr geochronology of Karoo felsic volcanics. In: Erlank A.J. (ed.) Petrogenesis of the volcanic rocks of the Karoo Province . Special Publications of the Geological Society of South Africa 13 273\u2013280."},{"key":"e_1_3_2_2_1","first-page":"167","volume":"85","year":"1982","unstructured":"Bristow, J.W., 1982. Geology and structure of Karoo volcanic and sedimentary rocks of the northern and central Lebombo. Transactions of the Geological Society of South Africa, 85, 167\u2013178.","journal-title":"Transactions of the Geological Society of South Africa"},{"key":"e_1_3_2_3_1","unstructured":"Bristow J.W. 1984. Nephelinites of the north Lebombo and south-east Zimbabwe. In: Erlank A.J. (ed.) Petrogenesis of the volcanic rocks of the Karoo Province . Special Publications of the Geological Society of South Africa 13 87\u2013104."},{"key":"e_1_3_2_4_1","doi-asserted-by":"crossref","unstructured":"Bryan S.E. Riley T.R. Jerram D.A. 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