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Kiipli, T. et al., 2012a

Correlation of upper Llandovery - lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of ash clouds and shelf sea currents in determining areal distribution of bentonite

Kiipli, T., Kallaste, T., Nestor, V.
DOI10.3176/earth.2012.4.08
Aasta2012
AjakiriEstonian Journal of Earth Sciences
Köide61
Number4
Leheküljed295-306
Tüüpartikkel ajakirjas
Joonised1-6
OpenAccess
LitsentsCC BY 4.0
Eesti autor
Keelinglise
Id2533

Abstrakt

Study of volcanic ash beds using biostratigraphy, sanidine composition and immobile elements within bentonites has manifested several well-established and some provisional correlations between Gotland and East Baltic sections. Energy dispersive X-ray fluorescence microanalysis of phenocrysts has revealed bentonites containing Mg-rich or Fe-rich biotite. Sanidine phenocrysts contain, in addition to a major Na and K component, often a few per cent of Ca and Ba. On the basis of new correlations the mapping of the distribution areas of bentonites has been extended from the East Baltic to Gotland. The bentonite distribution can be separated into two parts in North Latvia–South Estonia, indicating the existence of shelf sea currents in the Baltic Silurian Basin.

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