The Sommerodde (Telychian, Silurian) positive carbon isotope excursion: why is its magnitude so variable?

0577933 - GLÚ 2024 RIV GB eng J - Článek v odborném periodiku
Loydell, D. K. - Gutiérrez-Marco, J. C. - Štorch, Petr
The Sommerodde (Telychian, Silurian) positive carbon isotope excursion: why is its magnitude so variable?
Journal of the Geological Society. Roč. 180, č. 5 (2023), č. článku jgs2023-037. ISSN 0016-7649. E-ISSN 2041-479X
Institucionální podpora: RVO:67985831
Klíčová slova: carbon isotope record * graptolite biostratigraphy * SOCIE * lower Silurian
Obor OECD: Geology
Impakt faktor: 2.7, rok: 2022
Způsob publikování: Open access
https://www.lyellcollection.org/doi/epub/10.1144/jgs2023-037

The Sommerodde positive organic carbon isotope excursion (SOCIE) within the Oktavites spiralis graptolite Biozone (Telychian, Silurian) was first identified in the Sommerodde-1 core, Bornholm, Denmark, where it is the largest positive excursion within the Upper Ordovician–lower Silurian part of the core. Other published occurrences of the SOCIE are discussed here, including new δ¹³C_org data from the Jabalón River section, Corral de Calatrava, central Spain, where the SOCIE is only a very minor positive excursion. Very unusually, the SOCIE is best developed in deeper water settings, contrary to the typical pattern of declining excursionmagnitude offshore. In the Sommerodde-1 core (Bornholm), and where it has been tentatively identified in the Vežaičiai-2 core (Lithuania), the SOCIE is developed in pale, organic-poormudstones. It is considered likely that themagnitude of the SOCIE has been enhanced in the Sommerodde-1 core record by a change in organic matter composition in the deep-marine environment that did not have such a significant effect in shallower marine environments.
Trvalý link: https://hdl.handle.net/11104/0347629