Wenlock bentonites in Lithuania and correlation with bentonites from sections in Estonia, Sweden and Norway
2008; Taylor & Francis; Volume: 130; Issue: 4 Linguagem: Inglês
10.1080/11035890809452773
ISSN2000-0863
AutoresTarmo Kiipli, Sigitas Radzevičius, T Kallaste, Vykintas Motuza, Lennart Jeppsson, Linda Wickström,
Tópico(s)Clay minerals and soil interactions
ResumoAbstract Seven Wenlock bentonite beds from four drill cores in Lithuania with sufficient thickness for sampling were analysed by XRD and XRF. The sanidine composition of bentonites combined with graptolite biozonation of the host rock were used for correlations. Two of the studied bentonite samples at the antennulariuslflexilis biozone boundary can be confidently correlated between two Lithuanian sections. Four of the studied bentonites can be correlated with lower or higher probability with earlier studied bentonites in Estonia and Sweden. Identification of the Grötlingbo Bentonite in the Viduklė-61 drill core, and descriptions of other east Baltic sections enables composition of a thickness map of the Grötlingbo Bentonite. The thickness pattern with two axes, and the layered composition of the Grötlingbo Bentonite, indicate a change of the wind direction during a long lasting eruption. Hypothetical location of the volcanic source in the Silurian was within the zone of the Baltica-Laurentia collision. Key Words: WenlockbentonitesK-bentonitessanidinegraptolitescorrelationLithuania
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