Faunal and facies changes through the mid Homerian (late Wenlock, Silurian) positive carbon isotope excursion in Podolia, western Ukraine
Jarochowska E, Munnecke A, Frisch K, Ray DC, Castagner A (2016)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2016
Journal
Publisher: Blackwell Publishing Ltd
Book Volume: 49
Pages Range: 170-198
Journal Issue: 2
URI: http://onlinelibrary.wiley.com/doi/10.1111/let.12137/abstract
DOI: 10.1111/let.12137
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.
Authors with CRIS profile
Emilia Jarochowska
Lehrstuhl für Paläoumwelt
Axel Munnecke
Professur für Paläontologie (Schwerpunkt Faziesanalyse)
Involved external institutions
Goethe-Universität Frankfurt am Main
Germany (DE)
Carleton University
Canada (CA)
University of Birmingham
United Kingdom (GB)
Germany (DE)
Carleton University
Canada (CA)
University of Birmingham
United Kingdom (GB)
How to cite
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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