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Correlation of Silurian bentonites from Gotland and the eastern Baltic using sanidine phenocryst composition, and biostratigraphical consequences

Kiipli, T.; L, Jeppsson; Kallaste, T and Söderlund, Ulf LU (2008) In Journal of the Geological Society 165. p.211-220
Abstract
Silurian bentonites from Sweden and the eastern Baltic are correlated using XRD analysis of sanidine composition. Identifying the same bentonite in different sections has constrained correlations between the conodont, graptolite and chitinozoan zonations. Three bentonites correlate the Cyrtograptus murchisoni Zone with the upper part of the Pterospathodus amorphognathoides Zone and both the Lower and the Upper Pseudooneotodus bicornis conodont biozones at their type locality. Thus the base of the Llandovery-Wenlock boundary stratotype can be correlated with a level in the upper part of the Cyrtograptus murchisoni graptolite Biozone. Identifying the Y Bentonite (Gotland, Sweden) in eastern Baltic drill-cores shows that the base of the... (More)
Silurian bentonites from Sweden and the eastern Baltic are correlated using XRD analysis of sanidine composition. Identifying the same bentonite in different sections has constrained correlations between the conodont, graptolite and chitinozoan zonations. Three bentonites correlate the Cyrtograptus murchisoni Zone with the upper part of the Pterospathodus amorphognathoides Zone and both the Lower and the Upper Pseudooneotodus bicornis conodont biozones at their type locality. Thus the base of the Llandovery-Wenlock boundary stratotype can be correlated with a level in the upper part of the Cyrtograptus murchisoni graptolite Biozone. Identifying the Y Bentonite (Gotland, Sweden) in eastern Baltic drill-cores shows that the base of the Eisenackitina lagena chitinozoan Biozone is close to the base of the K patula conodont Biozone, which is coeval with an upper part of the C rigidus graptolite Zone. Sanidine data from the Grotlingbo Bentonite fit well with previous correlations. Some bentonites from Gotland with distinct sanidine compositions and bulk geochemistries have not yet been identified elsewhere. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Journal of the Geological Society
volume
165
pages
211 - 220
publisher
The Geological Society Publishing House
external identifiers
  • wos:000253287800017
  • scopus:38949199348
ISSN
2041-479X
language
English
LU publication?
yes
id
76abc2c4-f39c-4081-8cc5-0f975273ca7d (old id 591654)
date added to LUP
2007-12-18 11:42:58
date last changed
2017-08-13 03:45:06
@article{76abc2c4-f39c-4081-8cc5-0f975273ca7d,
  abstract     = {Silurian bentonites from Sweden and the eastern Baltic are correlated using XRD analysis of sanidine composition. Identifying the same bentonite in different sections has constrained correlations between the conodont, graptolite and chitinozoan zonations. Three bentonites correlate the Cyrtograptus murchisoni Zone with the upper part of the Pterospathodus amorphognathoides Zone and both the Lower and the Upper Pseudooneotodus bicornis conodont biozones at their type locality. Thus the base of the Llandovery-Wenlock boundary stratotype can be correlated with a level in the upper part of the Cyrtograptus murchisoni graptolite Biozone. Identifying the Y Bentonite (Gotland, Sweden) in eastern Baltic drill-cores shows that the base of the Eisenackitina lagena chitinozoan Biozone is close to the base of the K patula conodont Biozone, which is coeval with an upper part of the C rigidus graptolite Zone. Sanidine data from the Grotlingbo Bentonite fit well with previous correlations. Some bentonites from Gotland with distinct sanidine compositions and bulk geochemistries have not yet been identified elsewhere.},
  author       = {Kiipli, T. and L, Jeppsson and Kallaste, T and Söderlund, Ulf},
  issn         = {2041-479X},
  language     = {eng},
  pages        = {211--220},
  publisher    = {The Geological Society Publishing House},
  series       = {Journal of the Geological Society},
  title        = {Correlation of Silurian bentonites from Gotland and the eastern Baltic using sanidine phenocryst composition, and biostratigraphical consequences},
  volume       = {165},
  year         = {2008},
}