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Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Grönhögen-2015 drill core, Öland, Sweden

AHLBERG, PER LU ; LUNDBERG, FRANS ; ERLSTRÖM, MIKAEL LU ; CALNER, MIKAEL LU orcid ; LINDSKOG, ANDERS LU ; DAHLQVIST, PETER LU and JOACHIMSKI, MICHAEL M. (2019) In Geological Magazine 156(06). p.935-949
Abstract

The Grönhögen-2015 core drilling on southern Öland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower–Middle Ordovician strata. The Cambrian succession includes the Äleklinta Member (upper Stage 5) of the Borgholm Formation and the Alum Shale Formation (Guzhangian–Tremadocian). Agnostoids and trilobites allowed subdivision of the succession into eight biozones, in ascending order: the uppermost Cambrian Series 3 (Guzhangian) Agnostus pisiformis Zone and the Furongian Olenus gibbosus, O. truncatus, Parabolina spinulosa, Sphaerophthalmus? flagellifer, Ctenopyge tumida, C. linnarssoni and Parabolina lobata zones. Conspicuous lithologic unconformities and the biostratigraphy show that the succession is incomplete and that... (More)

The Grönhögen-2015 core drilling on southern Öland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower–Middle Ordovician strata. The Cambrian succession includes the Äleklinta Member (upper Stage 5) of the Borgholm Formation and the Alum Shale Formation (Guzhangian–Tremadocian). Agnostoids and trilobites allowed subdivision of the succession into eight biozones, in ascending order: the uppermost Cambrian Series 3 (Guzhangian) Agnostus pisiformis Zone and the Furongian Olenus gibbosus, O. truncatus, Parabolina spinulosa, Sphaerophthalmus? flagellifer, Ctenopyge tumida, C. linnarssoni and Parabolina lobata zones. Conspicuous lithologic unconformities and the biostratigraphy show that the succession is incomplete and that there are several substantial gaps of variable magnitudes. Carbon isotope analyses (δ13Corg) through the Alum Shale Formation revealed two globally significant excursions: the Steptoean Positive Carbon Isotope Excursion (SPICE) in the lower–middle Paibian Stage, and the negative Top of Cambrian Excursion (TOCE), previously referred to as the HERB Event, in Stage 10. The δ13Corg chemostratigraphy is tied directly to the biostratigraphy and used for an improved integration of these excursions with the standard agnostoid and trilobite zonation of Scandinavia. Their relations to that of coeval successions in Baltoscandia and elsewhere are discussed. The maximum amplitudes of the SPICE and TOCE in the Grönhögen succession are comparable to those recorded in drill cores retrieved from Scania, southern Sweden. The results of this study will be useful for assessing biostratigraphic relations between shale successions and carbonate facies on a global scale.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
agnostoids, Alum Shale Formation, Borgholm Formation, carbon isotope excursion, Scandinavia, trilobites
in
Geological Magazine
volume
156
issue
06
pages
15 pages
publisher
Cambridge University Press
external identifiers
  • scopus:85047464647
ISSN
0016-7568
DOI
10.1017/S0016756818000298
language
English
LU publication?
yes
id
c241d17e-0f14-4bf1-859d-2f34ffea9a1e
date added to LUP
2018-06-05 10:49:52
date last changed
2023-02-25 18:35:45
@article{c241d17e-0f14-4bf1-859d-2f34ffea9a1e,
  abstract     = {{<p>The Grönhögen-2015 core drilling on southern Öland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower–Middle Ordovician strata. The Cambrian succession includes the Äleklinta Member (upper Stage 5) of the Borgholm Formation and the Alum Shale Formation (Guzhangian–Tremadocian). Agnostoids and trilobites allowed subdivision of the succession into eight biozones, in ascending order: the uppermost Cambrian Series 3 (Guzhangian) Agnostus pisiformis Zone and the Furongian Olenus gibbosus, O. truncatus, Parabolina spinulosa, Sphaerophthalmus? flagellifer, Ctenopyge tumida, C. linnarssoni and Parabolina lobata zones. Conspicuous lithologic unconformities and the biostratigraphy show that the succession is incomplete and that there are several substantial gaps of variable magnitudes. Carbon isotope analyses (δ<sup>13</sup>C<sub>org</sub>) through the Alum Shale Formation revealed two globally significant excursions: the Steptoean Positive Carbon Isotope Excursion (SPICE) in the lower–middle Paibian Stage, and the negative Top of Cambrian Excursion (TOCE), previously referred to as the HERB Event, in Stage 10. The δ<sup>13</sup>C<sub>org</sub> chemostratigraphy is tied directly to the biostratigraphy and used for an improved integration of these excursions with the standard agnostoid and trilobite zonation of Scandinavia. Their relations to that of coeval successions in Baltoscandia and elsewhere are discussed. The maximum amplitudes of the SPICE and TOCE in the Grönhögen succession are comparable to those recorded in drill cores retrieved from Scania, southern Sweden. The results of this study will be useful for assessing biostratigraphic relations between shale successions and carbonate facies on a global scale.</p>}},
  author       = {{AHLBERG, PER and LUNDBERG, FRANS and ERLSTRÖM, MIKAEL and CALNER, MIKAEL and LINDSKOG, ANDERS and DAHLQVIST, PETER and JOACHIMSKI, MICHAEL M.}},
  issn         = {{0016-7568}},
  keywords     = {{agnostoids; Alum Shale Formation; Borgholm Formation; carbon isotope excursion; Scandinavia; trilobites}},
  language     = {{eng}},
  number       = {{06}},
  pages        = {{935--949}},
  publisher    = {{Cambridge University Press}},
  series       = {{Geological Magazine}},
  title        = {{Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Grönhögen-2015 drill core, Öland, Sweden}},
  url          = {{http://dx.doi.org/10.1017/S0016756818000298}},
  doi          = {{10.1017/S0016756818000298}},
  volume       = {{156}},
  year         = {{2019}},
}