Archean—Paleoproterozoic boundary at the Karelian craton: First ion-microprobe U—Pb (SHRIMP II) data on zircons from mafic volcanics

In spite of the long history of study of Karelian geology, the question concerning position of the Archean Proterozoic boundary remains open thus far. According to the traditional scheme developed by Krats, this boundary was placed at the base of the Sumian Super horizon. The lower part of the latte...

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Bibliographic Details
Published in:	Doklady earth sciences Vol. 435; no. 1; pp. 1415 - 1419
Main Authors:	Zlobin, V. L., Bogina, M. M., Mints, M. V., Berezhnaya, N. G., Presnyakov, S. L., Paderin, I. P., Dorofeev, R. O.
Format:	Journal Article
Language:	English
Published:	Dordrecht SP MAIK Nauka/Interperiodica 01-11-2010 Springer Springer Nature B.V
Subjects:	Cratons Earth and Environmental Science Earth Sciences Igneous rocks Mineralogy Petrology Sedimentary geology Sedimentary rocks Zirconium Karelia Russia Russia DOKLADY Earth Science Basaltic Andesite Baltic Shield 206Pb Zircon
Online Access:	Get full text
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Summary:	In spite of the long history of study of Karelian geology, the question concerning position of the Archean Proterozoic boundary remains open thus far. According to the traditional scheme developed by Krats, this boundary was placed at the base of the Sumian Super horizon. The lower part of the latter is made up of two sedimentary-volcanogenic sequences, each of which (from the bottom upward) consists of highly mature sedimentary rocks (quartzites, arkoses) and basaltic andesites. The Sumian unit is terminated by a rhyodacitic volcanic sequence. The UPb age of the felsic volcanics determined by the conventional zircon technique accounts for 2434 8 Ma.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1028-334X 1531-8354
DOI:	10.1134/S1028334X10110012