Single zircon age for the felsic Rubbervale Formation, Murchison greenstone belt, South Africa

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Authors:Brandl, G.; Jaeckel, P.; Kröner, Alfred
Author Affiliations:Primary:
South African, Council for Geoscience, Pietersburg, South Africa
Other:
Universität Mainz, Germany
Max-Planck-Institut für Chemie, Germany
Volume Title:South African Journal of Geology
Source:South African Journal of Geology, 99(3), p.229-234. Publisher: Bureau for Scientific Publications, Pretoria, South Africa. ISSN: 1012-0750
Publication Date:1996
Note:In English with Afrikaans summary. 40 refs.; illus., incl. 1 plate, 3 tables, geol. sketch maps
Summary:Single zircon crystals were dated, using vapour digestion and evaporation techniques, from a felsic metavolcanic rock of the Rubbervale formation, an ∼ 4 km thick unit within the Murchison greenstone belt. These two methods yielded almost identical 207Pb/206Pb ages of 2965.2 ± 1.4 and 2967.5 ± 1.3 m.y., respectively. The mean age of 2966.5 ± 1.6 m.y. provides a maximum age for the associated Rooiwater complex, which is locally intrusive into the Rubbervale formation. There is a lack of isotopic data on the mafic portion of the Murchison belt, but suggestions for its regional setting are that the belt and adjacent gneissic terrains represent exotic crustal blocks, or that the Rooiwater complex together with the Rubbervale formation formed in an island arc setting. [R.A.H.]
Subjects:Absolute age; Archean; Dates; Greenstone belts; Intrusions; Island arcs; Metamorphic belts; Metamorphic rocks; Neoarchean; Nesosilicates; Orthosilicates; Paleoproterozoic; Pb/Pb; Precambrian; Proterozoic; Schists; Silicates; Upper Precambrian; Zircon; Zircon group; Africa; Kaapvaal Craton; Murchison greenstone belt; South Africa; Southern Africa; Transvaal region; Rooiwater Complex; Rubbervale Formation
Coordinates:S242000 S234000 E0313000 E0304000
Abstract Numbers:97M/1162
Record ID:2014068215
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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