A Baltic Perspective on the Early to Early Late Ordovician δ13C and δ18O Records and Its Paleoenvironmental Significance

Oluwaseun Edward; Christoph Korte; Clemens V. Ullmann; Jorge Colmenar; Nicolas Thibault; Gabriella Bagnoli; Svend Stouge; Christian M.Ø. Rasmussen

doi:10.1029/2021PA004309

A Baltic Perspective on the Early to Early Late Ordovician δ¹³C and δ¹⁸O Records and Its Paleoenvironmental Significance

Oluwaseun Edward, Christoph Korte, Clemens V. Ullmann, Jorge Colmenar, Nicolas Thibault, Gabriella Bagnoli, Svend Stouge, Christian M.Ø. Rasmussen^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

The current study presents new bed-by-bed brachiopod δ¹³C and δ¹⁸O records from Öland, Sweden, which together with previously published data from the East Baltic region, constitutes a high-resolution paired brachiopod and bulk rock carbon and oxygen isotope archive through the Lower to Upper Ordovician successions of Baltoscandia. This new data set refines the temporal control on the global Ordovician δ¹⁸O-trend considerably, improving paleoenvironmental reconstructions through the main phase of the Great Ordovician Biodiversification Event (GOBE). The new brachiopod carbon and oxygen isotope records from Öland display strong similarity with the East Baltic records, elucidating the regional consistency as well as global correlation utility of the ensuing composite Baltoscandian Lower to Middle Ordovician carbon and oxygen isotope record. The carbon isotope record from Öland indicates that the widely reported Middle Ordovician carbon cycle perturbation—MDICE (Mid-Darriwilian Carbon Isotope Excursion)—is recorded in both brachiopods and bulk carbonates. The oxygen isotope record reveals a long-term Lower to Upper Ordovician trend of increasingly heavier brachiopod δ¹⁸O values, with a pronounced increase during the Middle Ordovician Darriwilian Stage. We interpret this trend as dominantly reflecting a paleotemperature signal indicating progressively cooler Early to Middle Ordovician climate with glacio-eustasy. Our Baltic δ¹⁸O values are therefore consistent with postulations that the biotic radiations during the GOBE and climatic cooling during the Darriwilian were strongly linked.

Original language	English
Article number	e2021PA004309
Journal	Paleoceanography and Paleoclimatology
Volume	37
Issue number	3
Number of pages	26
ISSN	2572-4517
DOIs	https://doi.org/10.1029/2021PA004309
Publication status	Published - Mar 2022

Bibliographical note

Funding Information:
The authors acknowledge Bo Petersen for help with isotope analysis, Laurent Nicod, and Claudia Baumgartner (UNIL) for help with thin-section preparation. Morten L. Nielsen, Bristol, is thanked for field assistance, as are Cementa, the company operating the Degerhamn quarry, who permitted us to collect samples, and L?nsstyrelsen in Kalmar who gave permission to GB and SS to sample the sections at Horns Udde. The study was funded by GeoCenter Denmark Grant nos. 2015-5 and 3-2017 to CM?R. This study is a contribution to IGCP project 735 ? "Rocks and the Rise of Ordovician Life (Rocks n' ROL)"

Funding Information:
The authors acknowledge Bo Petersen for help with isotope analysis, Laurent Nicod, and Claudia Baumgartner (UNIL) for help with thin‐section preparation. Morten L. Nielsen, Bristol, is thanked for field assistance, as are Cementa, the company operating the Degerhamn quarry, who permitted us to collect samples, and Länsstyrelsen in Kalmar who gave permission to GB and SS to sample the sections at Horns Udde. The study was funded by GeoCenter Denmark Grant nos. 2015‐5 and 3‐2017 to CMØR. This study is a contribution to IGCP project 735 − "Rocks and the Rise of Ordovician Life (Rocks n' ROL)"

Publisher Copyright:
© 2022. The Authors.

Keywords

brachiopods
Early Paleozoic
Great Ordovician Biodiversification Event (GOBE)
paleoclimate
stable isotopes
Öland

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Cite this

A Baltic Perspective on the Early to Early Late Ordovician δ¹³C and δ¹⁸O Records and Its Paleoenvironmental Significance. / Edward, Oluwaseun; Korte, Christoph; Ullmann, Clemens V.; Colmenar, Jorge; Thibault, Nicolas; Bagnoli, Gabriella; Stouge, Svend ; Rasmussen, Christian M.Ø.

In: Paleoceanography and Paleoclimatology, Vol. 37, No. 3, e2021PA004309, 03.2022.

Research output: Contribution to journal › Journal article › Research › peer-review

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title = "A Baltic Perspective on the Early to Early Late Ordovician δ13C and δ18O Records and Its Paleoenvironmental Significance",

abstract = "The current study presents new bed-by-bed brachiopod δ13C and δ18O records from {\"O}land, Sweden, which together with previously published data from the East Baltic region, constitutes a high-resolution paired brachiopod and bulk rock carbon and oxygen isotope archive through the Lower to Upper Ordovician successions of Baltoscandia. This new data set refines the temporal control on the global Ordovician δ18O-trend considerably, improving paleoenvironmental reconstructions through the main phase of the Great Ordovician Biodiversification Event (GOBE). The new brachiopod carbon and oxygen isotope records from {\"O}land display strong similarity with the East Baltic records, elucidating the regional consistency as well as global correlation utility of the ensuing composite Baltoscandian Lower to Middle Ordovician carbon and oxygen isotope record. The carbon isotope record from {\"O}land indicates that the widely reported Middle Ordovician carbon cycle perturbation—MDICE (Mid-Darriwilian Carbon Isotope Excursion)—is recorded in both brachiopods and bulk carbonates. The oxygen isotope record reveals a long-term Lower to Upper Ordovician trend of increasingly heavier brachiopod δ18O values, with a pronounced increase during the Middle Ordovician Darriwilian Stage. We interpret this trend as dominantly reflecting a paleotemperature signal indicating progressively cooler Early to Middle Ordovician climate with glacio-eustasy. Our Baltic δ18O values are therefore consistent with postulations that the biotic radiations during the GOBE and climatic cooling during the Darriwilian were strongly linked.",

keywords = "brachiopods, Early Paleozoic, Great Ordovician Biodiversification Event (GOBE), paleoclimate, stable isotopes, {\"O}land",

author = "Oluwaseun Edward and Christoph Korte and Ullmann, {Clemens V.} and Jorge Colmenar and Nicolas Thibault and Gabriella Bagnoli and Svend Stouge and Rasmussen, {Christian M.{\O}.}",

note = "Funding Information: The authors acknowledge Bo Petersen for help with isotope analysis, Laurent Nicod, and Claudia Baumgartner (UNIL) for help with thin-section preparation. Morten L. Nielsen, Bristol, is thanked for field assistance, as are Cementa, the company operating the Degerhamn quarry, who permitted us to collect samples, and L?nsstyrelsen in Kalmar who gave permission to GB and SS to sample the sections at Horns Udde. The study was funded by GeoCenter Denmark Grant nos. 2015-5 and 3-2017 to CM?R. This study is a contribution to IGCP project 735 ? {"}Rocks and the Rise of Ordovician Life (Rocks n' ROL){"} Funding Information: The authors acknowledge Bo Petersen for help with isotope analysis, Laurent Nicod, and Claudia Baumgartner (UNIL) for help with thin‐section preparation. Morten L. Nielsen, Bristol, is thanked for field assistance, as are Cementa, the company operating the Degerhamn quarry, who permitted us to collect samples, and L{\"a}nsstyrelsen in Kalmar who gave permission to GB and SS to sample the sections at Horns Udde. The study was funded by GeoCenter Denmark Grant nos. 2015‐5 and 3‐2017 to CM{\O}R. This study is a contribution to IGCP project 735 − {"}Rocks and the Rise of Ordovician Life (Rocks n' ROL){"} Publisher Copyright: {\textcopyright} 2022. The Authors.",

year = "2022",

month = mar,

doi = "10.1029/2021PA004309",

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journal = "Paleoceanography and Paleoclimatology",

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T1 - A Baltic Perspective on the Early to Early Late Ordovician δ13C and δ18O Records and Its Paleoenvironmental Significance

AU - Edward, Oluwaseun

AU - Korte, Christoph

AU - Ullmann, Clemens V.

AU - Colmenar, Jorge

AU - Thibault, Nicolas

AU - Bagnoli, Gabriella

AU - Stouge, Svend

AU - Rasmussen, Christian M.Ø.

N1 - Funding Information: The authors acknowledge Bo Petersen for help with isotope analysis, Laurent Nicod, and Claudia Baumgartner (UNIL) for help with thin-section preparation. Morten L. Nielsen, Bristol, is thanked for field assistance, as are Cementa, the company operating the Degerhamn quarry, who permitted us to collect samples, and L?nsstyrelsen in Kalmar who gave permission to GB and SS to sample the sections at Horns Udde. The study was funded by GeoCenter Denmark Grant nos. 2015-5 and 3-2017 to CM?R. This study is a contribution to IGCP project 735 ? "Rocks and the Rise of Ordovician Life (Rocks n' ROL)" Funding Information: The authors acknowledge Bo Petersen for help with isotope analysis, Laurent Nicod, and Claudia Baumgartner (UNIL) for help with thin‐section preparation. Morten L. Nielsen, Bristol, is thanked for field assistance, as are Cementa, the company operating the Degerhamn quarry, who permitted us to collect samples, and Länsstyrelsen in Kalmar who gave permission to GB and SS to sample the sections at Horns Udde. The study was funded by GeoCenter Denmark Grant nos. 2015‐5 and 3‐2017 to CMØR. This study is a contribution to IGCP project 735 − "Rocks and the Rise of Ordovician Life (Rocks n' ROL)" Publisher Copyright: © 2022. The Authors.

PY - 2022/3

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N2 - The current study presents new bed-by-bed brachiopod δ13C and δ18O records from Öland, Sweden, which together with previously published data from the East Baltic region, constitutes a high-resolution paired brachiopod and bulk rock carbon and oxygen isotope archive through the Lower to Upper Ordovician successions of Baltoscandia. This new data set refines the temporal control on the global Ordovician δ18O-trend considerably, improving paleoenvironmental reconstructions through the main phase of the Great Ordovician Biodiversification Event (GOBE). The new brachiopod carbon and oxygen isotope records from Öland display strong similarity with the East Baltic records, elucidating the regional consistency as well as global correlation utility of the ensuing composite Baltoscandian Lower to Middle Ordovician carbon and oxygen isotope record. The carbon isotope record from Öland indicates that the widely reported Middle Ordovician carbon cycle perturbation—MDICE (Mid-Darriwilian Carbon Isotope Excursion)—is recorded in both brachiopods and bulk carbonates. The oxygen isotope record reveals a long-term Lower to Upper Ordovician trend of increasingly heavier brachiopod δ18O values, with a pronounced increase during the Middle Ordovician Darriwilian Stage. We interpret this trend as dominantly reflecting a paleotemperature signal indicating progressively cooler Early to Middle Ordovician climate with glacio-eustasy. Our Baltic δ18O values are therefore consistent with postulations that the biotic radiations during the GOBE and climatic cooling during the Darriwilian were strongly linked.

AB - The current study presents new bed-by-bed brachiopod δ13C and δ18O records from Öland, Sweden, which together with previously published data from the East Baltic region, constitutes a high-resolution paired brachiopod and bulk rock carbon and oxygen isotope archive through the Lower to Upper Ordovician successions of Baltoscandia. This new data set refines the temporal control on the global Ordovician δ18O-trend considerably, improving paleoenvironmental reconstructions through the main phase of the Great Ordovician Biodiversification Event (GOBE). The new brachiopod carbon and oxygen isotope records from Öland display strong similarity with the East Baltic records, elucidating the regional consistency as well as global correlation utility of the ensuing composite Baltoscandian Lower to Middle Ordovician carbon and oxygen isotope record. The carbon isotope record from Öland indicates that the widely reported Middle Ordovician carbon cycle perturbation—MDICE (Mid-Darriwilian Carbon Isotope Excursion)—is recorded in both brachiopods and bulk carbonates. The oxygen isotope record reveals a long-term Lower to Upper Ordovician trend of increasingly heavier brachiopod δ18O values, with a pronounced increase during the Middle Ordovician Darriwilian Stage. We interpret this trend as dominantly reflecting a paleotemperature signal indicating progressively cooler Early to Middle Ordovician climate with glacio-eustasy. Our Baltic δ18O values are therefore consistent with postulations that the biotic radiations during the GOBE and climatic cooling during the Darriwilian were strongly linked.

KW - brachiopods

KW - Early Paleozoic

KW - Great Ordovician Biodiversification Event (GOBE)

KW - paleoclimate

KW - stable isotopes

KW - Öland

U2 - 10.1029/2021PA004309

DO - 10.1029/2021PA004309

M3 - Journal article

AN - SCOPUS:85127291725

VL - 37

JO - Paleoceanography and Paleoclimatology

JF - Paleoceanography and Paleoclimatology

SN - 0883-8305

IS - 3

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ER -