RT Journal Article
T1 The Sommerodde (Telychian, Silurian) positive carbon isotope excursion: why is its magnitude so variable?
A1 Loydell, D. K.
A1 Gutiérrez Marco, Juan Carlos
A1 Štorch, Petr
AB 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 13Corg 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 excursion magnitude 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-poor mudstones. It is considered likely that the magnitude 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.
PB The Geological Society
SN 0016-7649
YR 2023
FD 2023-09-18
LK https://hdl.handle.net/20.500.14352/101826
UL https://hdl.handle.net/20.500.14352/101826
LA eng
NO Loydell, David K., et al. «The Sommerodde (Telychian, Silurian) Positive Carbon Isotope Excursion: Why Is Its Magnitude so Variable?» Journal of the Geological Society, vol. 180, n.o 5, septiembre de 2023, pp. jgs2023-037. DOI.org (Crossref), https://doi.org/10.1144/jgs2023-037.
NO Emma Hammarlund
DS Docta Complutense
RD 11 abr 2025