Redox conditions and marine microbial community changes during the end-Ordovician mass extinction event

Smolarek, Justyna; Marynowski, Leszek; Trela, Wiesław; Kujawski, Piotr; Simoneit, Bernd R.T.

doi:10.1016/j.gloplacha.2017.01.002

Cited by 32 publications

(16 citation statements)

References 119 publications

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“…Commonly used biomarkers of Chlorobiaceae include chlorobactane, isorenieratane, palaerenieratane and their derivatives, the aryl isoprenoids with corresponding enriched δ 13 C values (Summons and Powell, 1987;Grice et al, 1996). Biomarkers for PZE have been identified in some (restricted) Ordovician-Silurian settings (Koopmans et al, 1996;Pancost et al, 1998;Vandenbroucke et al, 2009;Smolarek et al, 2017). In this study, trace amounts of palaerenieratane and isorenieratane were identified in Solanum-1 at 316.2-316.3 m and in Theia-1 at 1552.7-1552.75 m and aryl isoprenoids of uncertain origin in others (SOM).…”

Section: Evidence Of Water-column Stratification and Anoxiasupporting

confidence: 48%

“…The C27:C28:C29 sterane distribution in Lower Paleozoic marine deposits is generally characterised by either equal amounts of C27 and C29 steranes or a predominance of C29 steranes (Grantham and Wakefield, 1988;Schwark and Empt, 2006;), although, a strong predominance of C27 steranes has been noted in certain Upper Ordovician marine sections (Mustafa et al, 2015;Smolarek et al, 2017). In the upper Goldwyer, the percentages of C27 steranes (of C27-29 steranes) vary from ca.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…In sections from Baltica, a predominance of C29 steranes is observed during the Katian, which shifts to a strong predominance of C27 steranes (ca. 50-98%) during the Hirnantian(Mustafa et al, 2015;Smolarek et al, 2017). Despite the limited amount of data, these geographical and temporal variations highlight the potential for biomarker studies to evaluate biodiversity changes throughout the Ordovician.There is a growing body of evidence that terrestrial life originated on the Gondwanan palaeocontinent during the Early-Middle Ordovician(Steemans et al, 2010 and references therein; Edwards et al, 2014).…”

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confidence: 99%

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Environmental conditions and microbial community structure during the Great Ordovician Biodiversification Event; a multi-disciplinary study from the Canning Basin, Western Australia

Spaak

Edwards

Foster

et al. 2017

Global and Planetary Change

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Section: Evidence Of Water-column Stratification and Anoxiasupporting

confidence: 48%

Section: Accepted Manuscriptmentioning

confidence: 99%

mentioning

confidence: 99%

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Environmental conditions and microbial community structure during the Great Ordovician Biodiversification Event; a multi-disciplinary study from the Canning Basin, Western Australia

Spaak

Edwards

Foster

et al. 2017

Global and Planetary Change

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“…The causes of LOME remain the subject of extensive debate. Several triggering mechanisms have been proposed over the years 7 , including bioevolutionary events 8,9 , oceanographic changes 5,10–12 , and geotectonic processes (e.g. a possible mid-Ordovician superplume) 13,14 .…”

Section: Introductionmentioning

confidence: 99%

Mercury Spikes Indicate a Volcanic Trigger for the Late Ordovician Mass Extinction Event: An Example from a Deep Shelf of the Peri-Baltic Region

Smolarek-Lach

Marynowski

Trela

et al. 2019

Sci Rep

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The Late Ordovician mass extinction (LOME) was the second largest Phanerozoic crisis, but its cause remains elusive. Several triggering mechanisms have been proposed over the years, including bioevolutionary events, oceanographic changes, and geotectonic processes. Here, we report the presence of Hg spikes in the Zbrza PIG-1 borehole from the Upper Ordovician deep shelf sections of the peri-Baltic region. A strong positive anomaly in the lower late Katian (Hg/TOC = 2537.3 ppb/wt%) was noted. No correlation between Hg and TOC (R 2 = 0.07) was distinguished in the Hirnantian, although several positive anomalies were found. Because the Hg/Mo ratio showed trends very similar to those of Hg/TOC, it seems likely that TOC values reflect the redox conditions. In order to evaluate the role of anoxia in levels of Hg enrichment several redox indicators were measured. These showed that the elevated mercury values in the Hirnantian are not caused by anoxia/euxinia because euxinic biomarkers (maleimides and aryl isoprenoids) are present in very low abundance and pyrite framboids are absent. In total, positive Hg/TOC anomalies occur in the lower late Katian, at the Katian - Hirnantian boundary, and in the late Hirnantian. The lack of a strong Hg/TOC correlation, Ni enrichments, and the absence of ‘anoxic indicators’ (no biomarkers, no framboids, low Mo concentration) at these levels, supports the interpretation that Hg enrichment is due to enhanced environmental loading. We conclude that our Hg and Hg/TOC values were associated with volcanic pulses which triggered the massive environmental changes resulting in the Late Ordovician mass extinction.

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“…Based on sedimentological and geochemical evidence, Kametaka et al (2005) (Berner and Raiswell 1984;Smolarek et al 2017). Therefore, the higher TOC and lower TS in the MCMM…”

Section: Redox Conditionsmentioning

confidence: 99%

New timing and geochemical constraints on the Capitanian (Middle Permian) extinction and environmental changes in deep-water settings: evidence from the Lower Yangtze region of South China

Zhang

Yao

Wignall

et al. 2019

JGS

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The Capitanian (Guadalupian) witnessed one of the major crises of the Phanerozoic and, like many other extinctions, it coincided with the eruption of large igneous province, in this case the Emeishan Traps of Southwest China. However, the timing and causal relationships of this event are in dispute. This study concentrates on the deep-water chert-mudstone strata of the Gufeng Formation and its transition to the Yinping Formation at Chaohu. Zircons from tuffs in the uppermost Gufeng Formation yield a U-Pb age of 261.6 ± 1.6 Ma, and comparison with sections around Emeishan suggests that they appeared in the Jinogondolella altudaensis conodont zone and persisted to the Jinogondolella xuanhanensis zone. This coincides with the Emeishan eruptions, and suggests that they probably derived from this province. Mineralogical and geochemical characteristics also show the tuffs are of acid volcanogenic origin and have a geochemical fingerprint of the ELIP. Our dating show that a crisis amongst radiolarians and a subsequent productivity decline occurred during the middle Capitanian, prior to the Guadalupian-Lopingian boundary. The Emeishan eruptions began immediately before this, indicating a likely causal relationship between these events. Major regression and marine anoxia/euxinia are two other important extinction-relevant environmental changes that occurred during this critical interval. The late Guadalupian crisis was of comparable magnitude to other mass extinctions (e.g., end-Triassic or end

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Redox conditions and marine microbial community changes during the end-Ordovician mass extinction event

Cited by 32 publications

References 119 publications

Environmental conditions and microbial community structure during the Great Ordovician Biodiversification Event; a multi-disciplinary study from the Canning Basin, Western Australia

Environmental conditions and microbial community structure during the Great Ordovician Biodiversification Event; a multi-disciplinary study from the Canning Basin, Western Australia

Mercury Spikes Indicate a Volcanic Trigger for the Late Ordovician Mass Extinction Event: An Example from a Deep Shelf of the Peri-Baltic Region

New timing and geochemical constraints on the Capitanian (Middle Permian) extinction and environmental changes in deep-water settings: evidence from the Lower Yangtze region of South China

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