Epigenesis of Middle Riphean Rocks in the Bashkir Meganticlinorium, Southern Urals: Timing of Alterations and Geological Implications

The Rb-Sr and K-Ar characteristics of whole-rock argillite samples from the Middle Riphean Yurmatinian Group have been studied. The timing of final rock alteration was estimated at 525 ± 30 Ma by the Rb-Sr geochronometer. In the section near the Bol'shoi Avzhyan Settlement, the rocks experience...

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Bibliographic Details
Published in:Lithology and Mineral Resources 2000-12, Vol.35 (6), p.571
Main Authors: Vinogradov, V I, Murav'ev, V I, Bujakaite, M I, Golovin, D I, Gorozhanin, V M, Veis, A F
Format: Article
Language:English
Subjects:
Geochemistry
Geology
Mineralogy
Plate tectonics
Rocks
Stratigraphy
Online Access:Get full text
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Summary:The Rb-Sr and K-Ar characteristics of whole-rock argillite samples from the Middle Riphean Yurmatinian Group have been studied. The timing of final rock alteration was estimated at 525 ± 30 Ma by the Rb-Sr geochronometer. In the section near the Bol'shoi Avzhyan Settlement, the rocks experienced alteration up to the stage of deep epigenesis. The K-Ar data indicate that rock alterations continued after the Rb-Sr system conservation and was accompanied by a gradual gain of K. The great temporal gap between alterations of Middle and Lower Riphean rocks was established in the southern Urals. This gap may be explained either by the affiliation of sampled rocks to different tectonic units or by principal errors in stratigraphic correlations.[PUBLICATION ABSTRACT]
ISSN:0024-4902
1573-8892
DOI:10.1023/A:1026601616053