Stages of the Epigenetic Alteration of Upper Precambrian Rocks from the Central East European Platform: Evidence from Rb-Sr and K-Ar Isotope-Geochemical Investigations

Results of K-Ar measurements in Upper Vendian-Lower Cambrian clayey rocks drilled in the Gavrilov Yam area are considered. Combined with earlier Rb-Sr measurements, they suggest that the examined rocks experienced several stages of epigenetic alteration. One of these stages registered by Rb-Sr and K...

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Published inLithology and Mineral Resources Vol. 38; no. 2; p. 177
Main Authors Vinogradov, V I, Golovin, D I, Bujakaite, M I, Burzin, M B
Format Journal Article
LanguageEnglish
Published Moscow Springer Nature B.V 01.03.2003
Subjects
Cambrian
Epigenetics
Precambrian
Rocks
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Summary:Results of K-Ar measurements in Upper Vendian-Lower Cambrian clayey rocks drilled in the Gavrilov Yam area are considered. Combined with earlier Rb-Sr measurements, they suggest that the examined rocks experienced several stages of epigenetic alteration. One of these stages registered by Rb-Sr and K-Ar geochronometers is related to events that occurred 650 ± 50 Ma ago. Another stage (390 Ma) registered only by the Rb-Sr geochronometer was related to Hercynian activation in the East European Platform. Probable causes responsible for different behaviors of Rb-Sr and K-Ar systems during the epigenetic rock transformation are discussed. The measured age exceeds the value obtained for the same rocks by stratigraphic methods.[PUBLICATION ABSTRACT]
ISSN:0024-4902
1573-8892
DOI:10.1023/A:1023408210419