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Kiipli et al., 2012

The Geniai Tuff in the southern East Baltic area - a new correlation tool near the Aeronian/Telychian stage boundary, Llandovery, Silurian

Kiipli, T., Radzievičius, S., Kallaste, T., Kiipli, E., Siir, S., Soesoo, A., Voolma, M.
DOI
DOI10.3140/bull.geosci.1313
Aasta2012
AjakiriBulletin of Geosciences
Köide87
Number4
Leheküljed695-704
Tüüpartikkel ajakirjas
OpenAccess
Eesti autor
Keelinglise
ISSN1214-1119
Id3993

Abstrakt

In three drill cores in Latvia and Lithuania a thin (1 cm thick) altered volcanic ash bed with high concentrations of phosphorus (up to 3%), cerium (1%), lanthanum (0.5%) and strontium (2.5%), has been found close to the Aeronian/Telychian boundary (Llandovery, Silurian, ca 438 Ma). Small, millimetre-thick lenses within the ash bed contain up to 12% P and Sr, up to 6% Ce and 3% La. These elements occur as a solid solution of goyazite-florencite mineral. Additionally, authigenic K-feldspar and kaolinite occur in this ash bed. The high concentrations of REE elements, strontium and phosphorus suggest a carbonatite source magma, but the strontium isotope ratio contradicts that origin. Such a unique composition in a volcanic ash layer is a good basis for using it as a marker horizon for correlation of sections.

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