Tagasi otsingusse
Kiipli, T. et al., 2010a

Composition and correlation of volcanic ash beds of Silurian age from the eastern Baltic

Kiipli, T., Kallaste, T., Nestor, V.
DOI
DOI10.1017/S0016756810000294
Aasta2010
AjakiriGeological Magazine
Köide147
Number6
Leheküljed895-909
Tüüpartikkel ajakirjas
Joonised12
Eesti autor
Keelinglise
Id1203

Abstrakt

Sanidine composition and bulk geochemistry of volcanic ash beds from the East Baltic indicate the subalkaline nature of the volcanism near the margins of the Baltica plate during the Silurian. Several bentonites in the Wenlock include a previously unknown sanidine with 48 to 58 mol % of the Na+Ca component. In contrast to the earlier Telychian volcanism, sodium-rich sanidine occurs in ash beds which originate from relatively moderately evolved dacitic magma. The studied material from two drill cores integrated with previous research enables production of a more complete list of 49 volcanic eruption layers for the lower to middle Wenlock in the East Baltic. This updated list of bentonites characterized by their sanidine compositions forms a good basis for future integrated bio- and chemostratigraphic

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