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Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Gronhogen-2015 drill core, Oland, Sweden

Per Ahlberg, Frans Lundberg, Mikael Erlstrom, Mikael Calner, Anders Lindskog, Peter Dahlqvist and Michael M. Joachimski
Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Gronhogen-2015 drill core, Oland, Sweden
Geological Magazine (June 2019) 156 (6): 935-949

Abstract

The Gronhogen-2015 core drilling on southern Oland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower-Middle Ordovician strata. The Cambrian succession includes the Aleklinta 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 (delta (super 13) C (sub org) ) 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 delta (super 13) C (sub org) 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 Gronhogen 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.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 156
Serial Issue: 6
Title: Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Gronhogen-2015 drill core, Oland, Sweden
Affiliation: Lund University, Department of Geology, Lund, Sweden
Pages: 935-949
Published: 201906
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 86
Accession Number: 2019-062047
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 1 plate, 1 table, geol. sketch map
N56°10'00" - N56°40'00", E16°15'00" - E16°34'60"
Secondary Affiliation: Geological Survey of Sweden, SWE, SwedenFriedrich-Alexander University of Erlangen-Nurnberg, DEU, Germany
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201932
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