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Composition and correlation of volcanic ash beds of Silurian age from the eastern Baltic

Published online by Cambridge University Press:  21 April 2010

TARMO KIIPLI ,
TOIVO KALLASTE  and
VIIU NESTOR
TARMO KIIPLI*
Affiliation:
Institute of Geology, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Estonia
TOIVO KALLASTE
Affiliation:
Institute of Geology, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Estonia
VIIU NESTOR
Affiliation:
Institute of Geology, Tallinn University of Technology, Ehitajate 5, 19086 Tallinn, Estonia
*
*Author for correspondence: tarmo.kiipli@gi.ee
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Abstract

Sanidine composition and bulk geochemistry of volcanic ash beds from the East Baltic indicate the subalkaline nature of the volcanism near the margins of the Baltica plate during the Silurian. Several bentonites in the Wenlock include a previously unknown sanidine with 48 to 58 mol % of the Na+Ca component. In contrast to the earlier Telychian volcanism, sodium-rich sanidine occurs in ash beds which originate from relatively moderately evolved dacitic magma. The studied material from two drill cores integrated with previous research enables production of a more complete list of 49 volcanic eruption layers for the lower to middle Wenlock in the East Baltic. This updated list of bentonites characterized by their sanidine compositions forms a good basis for future integrated bio- and chemostratigraphic correlations in northern Europe.

Keywords

K-bentonitesbentonitesgeochemistryWenlockSilurianvolcanismEast Baltic
Type
Original Article
Information
Geological Magazine , Volume 147 , Issue 6 , November 2010 , pp. 895 - 909
Copyright
Copyright © Cambridge University Press 2010

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