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Wenlock metabentonites from Gotland, Sweden: geochemistry, sources and potential as chemostratigraphic markers

Batchelor, R.A. and Jeppsson, Lennart LU (1999) In Geological Magazine 136(6). p.661-669
Abstract
Two metabentonite suites occur within the Wenlock limestones and marls of Gotland, one within the Slite Formation (M. belophorus to the C. ellesae biozones) and the other in the Mulde Formation (G. nassaM. dubius Biozone). Their geochemical characteristics based on rare-earth element (REE) distributions in apatite crystals separated from the metabentonites suggest origins from three separate volcanic sources. One of these sources has an alkaline affinity, reflected in relatively high levels of Th, Nb and Zr, which suggests that it may have lain over thickening continental crust during the waning stages of the closure of the Tornquist Sea, while the other two represent calc-alkaline magmas. The source of the volcanic ash is placed some 400... (More)
Two metabentonite suites occur within the Wenlock limestones and marls of Gotland, one within the Slite Formation (M. belophorus to the C. ellesae biozones) and the other in the Mulde Formation (G. nassaM. dubius Biozone). Their geochemical characteristics based on rare-earth element (REE) distributions in apatite crystals separated from the metabentonites suggest origins from three separate volcanic sources. One of these sources has an alkaline affinity, reflected in relatively high levels of Th, Nb and Zr, which suggests that it may have lain over thickening continental crust during the waning stages of the closure of the Tornquist Sea, while the other two represent calc-alkaline magmas. The source of the volcanic ash is placed some 400 km to the southwest of Gotland, on the TornquistTeysseyre Zone, which is the northernmost expression of the Trans-European Suture Zone. Distinctive differences in REE distribution in apatite from these metabentonites should assist in future correlation studies in Wenlock stratigraphy, both within the Baltic region and further afield. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Geological Magazine
volume
136
issue
6
pages
661 - 669
publisher
Cambridge University Press
external identifiers
  • wos:000085038000005
  • scopus:0033500614
ISSN
0016-7568
DOI
10.1017/S001675689900285X
language
English
LU publication?
yes
id
652859dd-3605-4b93-bf1b-7477db800d6c (old id 131691)
date added to LUP
2007-07-20 15:31:38
date last changed
2017-01-01 04:28:57
@article{652859dd-3605-4b93-bf1b-7477db800d6c,
  abstract     = {Two metabentonite suites occur within the Wenlock limestones and marls of Gotland, one within the Slite Formation (M. belophorus to the C. ellesae biozones) and the other in the Mulde Formation (G. nassaM. dubius Biozone). Their geochemical characteristics based on rare-earth element (REE) distributions in apatite crystals separated from the metabentonites suggest origins from three separate volcanic sources. One of these sources has an alkaline affinity, reflected in relatively high levels of Th, Nb and Zr, which suggests that it may have lain over thickening continental crust during the waning stages of the closure of the Tornquist Sea, while the other two represent calc-alkaline magmas. The source of the volcanic ash is placed some 400 km to the southwest of Gotland, on the TornquistTeysseyre Zone, which is the northernmost expression of the Trans-European Suture Zone. Distinctive differences in REE distribution in apatite from these metabentonites should assist in future correlation studies in Wenlock stratigraphy, both within the Baltic region and further afield.},
  author       = {Batchelor, R.A. and Jeppsson, Lennart},
  issn         = {0016-7568},
  language     = {eng},
  number       = {6},
  pages        = {661--669},
  publisher    = {Cambridge University Press},
  series       = {Geological Magazine},
  title        = {Wenlock metabentonites from Gotland, Sweden: geochemistry, sources and potential as chemostratigraphic markers},
  url          = {http://dx.doi.org/10.1017/S001675689900285X},
  volume       = {136},
  year         = {1999},
}