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Early Silurian δ 13 C org excursions in the foreland basin of Baltica, both familiar and surprising

Hammarlund, Emma U. LU ; Loydell, David K. ; Nielsen, Arne T. and Schovsbo, Niels H. (2019) In Palaeogeography, Palaeoclimatology, Palaeoecology 526. p.126-135
Abstract


The Sommerodde-1 core from Bornholm, Denmark, provides a nearly continuous sedimentary archive from the Upper Ordovician through to the Wenlock Series (lower Silurian), as constrained by graptolite biostratigraphy. The cored mudstones represent a deep marine depositional setting in the foreland basin fringing Baltica and we present high-resolution data on the isotopic composition of the section's organic carbon (δ
13
C
org
... (More)


The Sommerodde-1 core from Bornholm, Denmark, provides a nearly continuous sedimentary archive from the Upper Ordovician through to the Wenlock Series (lower Silurian), as constrained by graptolite biostratigraphy. The cored mudstones represent a deep marine depositional setting in the foreland basin fringing Baltica and we present high-resolution data on the isotopic composition of the section's organic carbon (δ
13
C
org
). This chemostratigraphical record is correlated with previously recognized δ
13
C excursions in the Upper Ordovician–lower Silurian, including the Hirnantian positive isotope carbon excursion (HICE), the early Aeronian positive carbon isotope excursion (EACIE), and the early Sheinwoodian positive carbon isotope excursion (ESCIE). A new positive excursion of high magnitude (~4‰)is discovered in the Telychian Oktavites spiralis Biozone (lower Silurian)and we name it the Sommerodde Carbon Isotope Excursion (SOCIE). The SOCIE appears discernible in δ
13
C
carb
data from Latvian and Estonian cores but it is not yet widely recognized. However, the magnitude of the excursion within the deep, marine, depositional setting, represented by the Sommerodde-1 core, suggests that the SOCIE reflects a significant event. In addition, the chemostratigraphical record of the Sommerodde-1 core reveals the negative excursion at the transition from the Aeronian to Telychian stages (the ‘Rumba low’), and suggests that the commencement of the EACIE at the base of the Demirastrites triangulatus Biozone potentially is a useful chemostratigraphical marker for the base of the Aeronian Stage.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Chemostratigraphy, Oktavites spiralis Biozone, Rumba low, SOCIE, Sommerodde-1 core, δ C
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
526
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85065206244
ISSN
0031-0182
DOI
10.1016/j.palaeo.2019.03.035
language
English
LU publication?
yes
id
5f8912ad-bc6d-44f3-b455-2309a6c95edf
date added to LUP
2019-05-20 12:17:07
date last changed
2019-12-10 08:05:11
@article{5f8912ad-bc6d-44f3-b455-2309a6c95edf,
  abstract     = {<p><br>
                                                         The Sommerodde-1 core from Bornholm, Denmark, provides a nearly continuous sedimentary archive from the Upper Ordovician through to the Wenlock Series (lower Silurian), as constrained by graptolite biostratigraphy. The cored mudstones represent a deep marine depositional setting in the foreland basin fringing Baltica and we present high-resolution data on the isotopic composition of the section's organic carbon (δ                             <br>
                            <sup>13</sup><br>
                                                         C                             <br>
                            <sub>org</sub><br>
                                                         ). This chemostratigraphical record is correlated with previously recognized δ                             <br>
                            <sup>13</sup><br>
                                                         C excursions in the Upper Ordovician–lower Silurian, including the Hirnantian positive isotope carbon excursion (HICE), the early Aeronian positive carbon isotope excursion (EACIE), and the early Sheinwoodian positive carbon isotope excursion (ESCIE). A new positive excursion of high magnitude (~4‰)is discovered in the Telychian Oktavites spiralis Biozone (lower Silurian)and we name it the Sommerodde Carbon Isotope Excursion (SOCIE). The SOCIE appears discernible in δ                             <br>
                            <sup>13</sup><br>
                                                         C                             <br>
                            <sub>carb</sub><br>
                                                          data from Latvian and Estonian cores but it is not yet widely recognized. However, the magnitude of the excursion within the deep, marine, depositional setting, represented by the Sommerodde-1 core, suggests that the SOCIE reflects a significant event. In addition, the chemostratigraphical record of the Sommerodde-1 core reveals the negative excursion at the transition from the Aeronian to Telychian stages (the ‘Rumba low’), and suggests that the commencement of the EACIE at the base of the Demirastrites triangulatus Biozone potentially is a useful chemostratigraphical marker for the base of the Aeronian Stage.                         <br>
                        </p>},
  author       = {Hammarlund, Emma U. and Loydell, David K. and Nielsen, Arne T. and Schovsbo, Niels H.},
  issn         = {0031-0182},
  language     = {eng},
  pages        = {126--135},
  publisher    = {Elsevier},
  series       = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  title        = {Early Silurian δ                         
                        <sup>13</sup>
                                                 C                         
                        <sub>org</sub>
                                                  excursions in the foreland basin of Baltica, both familiar and surprising},
  url          = {http://dx.doi.org/10.1016/j.palaeo.2019.03.035},
  doi          = {10.1016/j.palaeo.2019.03.035},
  volume       = {526},
  year         = {2019},
}