Journal
ESTONIAN JOURNAL OF EARTH SCIENCES
Volume 60, Issue 4, Pages 207-219Publisher
ESTONIAN ACAD PUBLISHERS
DOI: 10.3176/earth.2011.4.02
Keywords
bentonites; K-bentonites; Wenlock; Ludlow; Silurian; chitinozoans; volcanism
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Funding
- Estonian Science Foundation [7605, 9386]
- Estonian Ministry of Education and Research [SF0140016s09, SF0140020s08]
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Nine altered volcanic ash samples from the shoal and lagoonal sediments of the Rootsikula Stage (Wenlock-Ludlow boundary interval, Estonia) were analysed, compared and correlated with five samples of deep sea environments from Latvia. Volcanic ash correlations indicate that the Wenlock-Ludlow boundary correlates with the boundary of the Viita and Kuusnomme beds, i.e., it is significantly lower than proposed earlier. The distribution of chitinozoans supports this new correlation. Geochemical data indicate subalkaline source magma of volcanic ashes with potassium dominating over sodium.
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