1982
DOI: 10.1144/gsjgs.139.5.0557
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A comparison of K-Ar and Rb-Sr ages of rapidly cooled igneous rocks: two points in the Palaeozoic time scale re-evaluated

Abstract: K-Ar and Rb-Sr ages were measured on rapidly cooled igneous rocks from Kinnekulle, Sweden (Ordovician bentonite), the Cerberean Cauldron, Australia (late Devonian felsic volcanics), Mount Dromedary, Australia (Cretaceous monzonite) and Cooma, Australia (Jurassic syenite). No systematic bias was detected between the ages determined by the two techniques, calculated using the constants recommended by the I.U.G.S. Subcommission on Geochronology. The K-Ar and Rb-Sr ages of the Jurassic syenite also were indistingu… Show more

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Cited by 71 publications
(37 citation statements)
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“…Williams et al 1982;Wyborn et al 1982;Claou6-Long et al 1995). All of these studies contribute to the Silurian-Carboniferous timescale database, but some are not without inconsistencies when their biostratigraphic ages are considered against other data (e.g.…”
Section: Time Scalesmentioning
confidence: 99%
See 2 more Smart Citations
“…Williams et al 1982;Wyborn et al 1982;Claou6-Long et al 1995). All of these studies contribute to the Silurian-Carboniferous timescale database, but some are not without inconsistencies when their biostratigraphic ages are considered against other data (e.g.…”
Section: Time Scalesmentioning
confidence: 99%
“…All of these studies contribute to the Silurian-Carboniferous timescale database, but some are not without inconsistencies when their biostratigraphic ages are considered against other data (e.g. the Cerberean Volcanics, Williams et al 1982;Compston 2000b; see below).…”
Section: Time Scalesmentioning
confidence: 99%
See 1 more Smart Citation
“…There is also a difference in age; the Kinnekulle bentonites were derived from ash fails dated at about 450 Ma (Bystrrm-Asklund et al, 1961;Kunk et al, 1984). The volcanic glass devitrifled to smectite and the further reaction to K-bentonite probably occurred during the Carboniferous age (340-300 Ma, Brusewitz, 1984;Williams et al, 1982). The Montana bentonites are younger (Upper Cretaceous), and the change to K-bentonite occurred at 76-50 Ma (Hoffman, 1976).…”
Section: Geological Settingmentioning
confidence: 99%
“…Gale, Beckinsale & Wadge (19796), complemented by Gale, Beckinsale & Wadge (1980), presented a body of evidence showing that, although the Rb-Sr system is easily disturbed in acid pyroclastics, Rb-Sr whole rock isochron ages for rhyolite lavas can often reliably date their time of extrusion. An excellent recent example is the work by Williams et al (1982) on the Cerberean Volcanics in Australia; they obtained a mean Rb-Sr biotite-whole rock age of 367 ± 3 Ma and a mean K-Ar biotite age of 366 ± 5 Ma for the biotite rhyodacite, whilst the contemporaneous basal rhyolite yielded a Rb-Sr isochron age for whole rocks and feldspars of 369 ± 3 Ma.…”
mentioning
confidence: 99%