Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite
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 rev...
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Estonian Academy Publishers
2012-11-01
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Online Access: | http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2012/issue_4/earth-2012-4-295-306.pdf |
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doaj-1215bfe8d9184e65ba53a473993e82a62020-11-25T02:35:43ZengEstonian Academy PublishersEstonian Journal of Earth Sciences1736-47281736-75572012-11-0161429530610.3176/earth.2012.4.08Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentoniteTarmo KiipliToivo KallasteViiu NestorStudy 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.http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2012/issue_4/earth-2012-4-295-306.pdfcorrelationbentonitesK-bentonitessea currentsSilurianEast BalticGotland. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tarmo Kiipli Toivo Kallaste Viiu Nestor |
spellingShingle |
Tarmo Kiipli Toivo Kallaste Viiu Nestor Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite Estonian Journal of Earth Sciences correlation bentonites K-bentonites sea currents Silurian East Baltic Gotland. |
author_facet |
Tarmo Kiipli Toivo Kallaste Viiu Nestor |
author_sort |
Tarmo Kiipli |
title |
Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite |
title_short |
Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite |
title_full |
Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite |
title_fullStr |
Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite |
title_full_unstemmed |
Correlation of upper Llandovery–lower Wenlock bentonites in the När (Gotland, Sweden) and Ventspils (Latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite |
title_sort |
correlation of upper llandovery–lower wenlock bentonites in the när (gotland, sweden) and ventspils (latvia) drill cores: role of volcanic ash clouds and shelf sea currents in determining areal distribution of bentonite |
publisher |
Estonian Academy Publishers |
series |
Estonian Journal of Earth Sciences |
issn |
1736-4728 1736-7557 |
publishDate |
2012-11-01 |
description |
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. |
topic |
correlation bentonites K-bentonites sea currents Silurian East Baltic Gotland. |
url |
http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2012/issue_4/earth-2012-4-295-306.pdf |
work_keys_str_mv |
AT tarmokiipli correlationofupperllandoverylowerwenlockbentonitesinthenargotlandswedenandventspilslatviadrillcoresroleofvolcanicashcloudsandshelfseacurrentsindeterminingarealdistributionofbentonite AT toivokallaste correlationofupperllandoverylowerwenlockbentonitesinthenargotlandswedenandventspilslatviadrillcoresroleofvolcanicashcloudsandshelfseacurrentsindeterminingarealdistributionofbentonite AT viiunestor correlationofupperllandoverylowerwenlockbentonitesinthenargotlandswedenandventspilslatviadrillcoresroleofvolcanicashcloudsandshelfseacurrentsindeterminingarealdistributionofbentonite |
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