Faunal and facies changes through the mid Homerian (late Wenlock, Silurian) positive carbon isotope excursion in Podolia, western Ukraine

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Jarochowska E, Munnecke A, Frisch K, Ray DC, Castagner A
Zeitschrift: Lethaia
Verlag: Blackwell Publishing Ltd
Jahr der Veröffentlichung: 2016
Band: 49
Heftnummer: 2
Seitenbereich: 170-198
ISSN: 0024-1164
eISSN: 1502-3931
Sprache: Englisch


Abstract


The late Wenlock is characterized by two global regressive-transgressive eustatic cycles in association with a double-peaked positive carbon isotope excursion. The onset of the excursion coincides with an extinction event affecting graptolites (the lundgreni event) and proposed to affect conodonts (the Mulde Event) and proliferation of non-skeletal carbonates. In order to test the hypothesized relationships between eustatic and ecological changes, the tropical carbonate Homerian succession in Podolia has been examined with respect to conodont, sequence and δC stratigraphy. Four depositional sequences (DS) have been identified. The onset of the δC excursion occurs at the boundary between DS1 and DS2, corresponding to a forced regression of proposed glacioeustatic origin. The following rapid eustatic transgression associated with the highest δC values of 5.2‰ includes a higher-order shallowing episode recorded in Podolia as normal regression and a boundary between DS2 and DS3. This interval is distinguished by the presence of oncoids and thrombolitic buildups. The latest Wenlock eustatic fall and the corresponding second peak of the δC excursion corresponds in Podolia to a stratigraphic gap. The first δC peak (top of DS1 and DS2) corresponds to the O. bohemica longa conodont Zone, the interval between the two peaks (DS3) - to K. ortus absidata and C. murchisoni zones, and DS4 is tentatively placed in the lowermost Ludlow Series. The record of relative sea-level changes in Podolia is consistent with reconstructions based on successions in England and Sweden. The moderate drop in conodont taxonomic richness may reflect the primary depositional control over their proposed extinction.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Jarochowska, Emilia Dr.
Lehrstuhl für Paläoumwelt
Munnecke, Axel Prof. Dr.
Professur für Paläontologie (Schwerpunkt Faziesanalyse)


Einrichtungen weiterer Autorinnen und Autoren

Carleton University
Goethe-Universität Frankfurt am Main
University of Birmingham


Forschungsbereiche

Klima und Ressourcen
Forschungsschwerpunkt einer Fakultät: Naturwissenschaftliche Fakultät


Zitierweisen

APA:
Jarochowska, E., Munnecke, A., Frisch, K., Ray, D.C., & Castagner, A. (2016). Faunal and facies changes through the mid Homerian (late Wenlock, Silurian) positive carbon isotope excursion in Podolia, western Ukraine. Lethaia, 49(2), 170-198. https://dx.doi.org/10.1111/let.12137

MLA:
Jarochowska, Emilia, et al. "Faunal and facies changes through the mid Homerian (late Wenlock, Silurian) positive carbon isotope excursion in Podolia, western Ukraine." Lethaia 49.2 (2016): 170-198.

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Zuletzt aktualisiert 2019-25-07 um 08:32