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Calner at Rödvig

Mikael Calner

Professor

Calner at Rödvig

Geochemical variations within the mid-Silurian Grotlingbo Bentonite (Gotland, Sweden): discriminating between magmatic composition, ash transport fractionation and diagenetic effects

Author

  • Peter Dahlqvist
  • Mikael Calner
  • Toivo Kallaste
  • Tarmo Kiipli
  • Sven Siir

Summary, in English

This paper reports on the geochemistry of the mid-Silurian Grotlingbo Bentonite, a ca. 0.10.4-m-thick and regionally important bentonite bed in Sweden and the East Baltic area. A series of eight samples, spaced by 5cm, were taken from the Hunninge-1 drillcore in Gotland, Sweden, and were analysed in order to establish the vertical element composition and variation in the bentonite. The results show that the Gotlingbo Bentonite originates from one source magma and from one single eruption. The lowermost 0.10.15m of the bentonite (compacted) was deposited from air-transport fall-out, whereas the upper portions have been reworked in a shallow-marine environment and re-deposited. Vertical differences in Ti and Zr within the Grotlingbo Bentonite mean that regional correlation of the bed may need several samples at each locality to be reliable.

Department/s

  • Lithosphere and Biosphere Science

Publishing year

2012

Language

English

Pages

273-282

Publication/Series

GFF

Volume

134

Issue

4

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Geology

Keywords

  • Sweden
  • Grotlingbo Bentonite
  • Gotland
  • Silurian

Status

Published

ISBN/ISSN/Other

  • ISSN: 2000-0863