The<i>lundgreni</i>Extinction Event: Integration of paleontological and geochemical data from Arctic Canada

Lenz, Alfred C.; Noble, Paula J.; Masiak, Monika; Poulson, Simon R.; Kozłowska, Anna

doi:10.1080/11035890601282153

Cited by 34 publications

(32 citation statements)

References 16 publications

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“…On Gotland the mid-Homerian excursion peak values are þ3.8% for the shallower water Hunninge-1 core and þ2.4% for the deeper water Grötlingbo-1 core; in the deep basin the excursion is only weakly developed, values increasing from À0.7% to only þ0.3% (Calner et al 2006, Chart 1). In Arctic Canada a similar mid-Homerian excursion trend is recorded by Lenz et al (2006): in the two sections studied close to the basin margin, Abbott River and Rookery Creek, peak d 13 C values are þ3.4% and þ3.3%, respectively; the value in the offshore Twilight Creek section is only þ2.3%.…”

Section: The Basinward Decline In the Magnitude Of Positive D 13 C Exmentioning

confidence: 65%

“…For the mid-Homerian excursion, in the Rookery Creek section, Cornwallis Island (Lenz et al 2006, figure 3), high TOC values occur in the lower dubius/nassa Zone, coinciding with the second highest d 13 C org value recorded in the section (the highest d 13 C org occurs within a nautiloid mass mortality layer; this presumably explains the low TOC recorded at this level). There is, however, no consistent relationship between TOC and d 13 C. In the Lupianka section, Poland, high TOC values extend from the uppermost lundgreni Zone through to the top of the nassa Zone (Porębska 1998, figure 2).…”

Section: The Mid-homerian Positive D 13 C Excursionmentioning

confidence: 88%

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Early Silurian positive δ¹³C excursions and their relationship to glaciations, sea‐level changes and extinction events

Loydell

2007

Geological Journal

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Evidence is presented from the upper Aeronian, lower Sheinwoodian and middle Homerian demonstrating that positive d 13 C excursions in the lower Silurian are the result of increased carbonate weathering and probably also enhanced burial of organic carbon coincident with sea-level falls resulting from growth of ice sheets on the South American part of Gondwana. Graptolite extinctions are coincident with the d 13 C excursions, whereas major conodont extinction events (Ireviken and Mulde) are not, but conversely, occur at times of high sea level. This suggests very different controls on graptolite and conodont global diversity patterns. Palynological studies suggest that netromorph acritarchs may have been opportunists that flourished during positive d 13 C excursion intervals.

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Section: The Basinward Decline In the Magnitude Of Positive D 13 C Exmentioning

confidence: 65%

Section: The Mid-homerian Positive D 13 C Excursionmentioning

confidence: 88%

Early Silurian positive δ¹³C excursions and their relationship to glaciations, sea‐level changes and extinction events

Loydell

2007

Geological Journal

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“…However, recent studies have revealed that the lundgreni Event (the beginning of the Mulde interval) probably had a rather minor effect on the phytoplankton (Venckutė-Aleksienė et al 2016). Major reductions in radiolarian biodiversity were documented during the middle Homerian of Arctic Canada (Lenz et al 2006). There are well documented changes of Text- fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

Upper Homerian (Silurian) high-resolution correlation using cyclostratigraphy: an example from western Lithuania

Radzevičius

Tumakovaitė

Spiridonov

2017

Acta Geologica Polonica

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ABSTRACT:Radzevičius, S., Tumakovaitė, B. and Spiridonov, A. 2017. Upper Homerian (Silurian) high-resolution correlation using cyclostratigraphy: an example from western Lithuania. Acta Geologica Polonica, 67 (2), 307-322. Warszawa.The Gėluva regional stage stratigraphically corresponds to the late Wenlock. This time interval witnessed significant graptolite extinctions and turnovers of conodont faunas, as well as a large positive Mulde carbon isotopic excursion. Thus, the development of a detailed stratigraphy is a necessary step in understanding the complex patterns of regional and global variations in the sediments accumulating during the time interval studied. Therefore, in this contribution we present a cyclostratigraphic analysis of gamma ray (GR) logs from four wells, which are located in the deep water facies belt of the Lithuanian part of the Silurian Baltic Basin of the Gėluva regional stage. The analysis was performed using REDFIT spectral estimation, continuous wavelet transform and signal filtering techniques. As a result two 4 th order and five 5 th order cycles were distinguished and named in all sections. The correlation of cycles between sections was calibrated with the graptolite biozones. The comparative analysis revealed that intra-basinal cyclostratigraphic correlation could achieve resolution of the order of several tens of thousands of years.

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“…The biotic changes in the open-shelf environments coincided in the shallow-water realm with the evidence of a rapid regression and emersion of large parts of carbonate platforms (summarized in Calner 2008; Munnecke et al 2010). During the post-extinction survival phase, low-diversity and high-abundance disaster faunas thrived (Koren 1987;Jaeger 1991;Urbanek 1993;Kaljo 1996;Melchin et al 1998;Porębska et al 2004;Lenz et al 2006;Noble et al 2012). During this survival phase, an increased abundance of microbialites in comparison to the pre-extinction intervals has been observed in Gotland (Calner & Säll 1999;Calner 2005c), Estonia (Kõrts 1991), and the Anglo-Welsh Basin (Ratcliffe 1988;Kershaw et al 2007).…”

Section: Introductionmentioning

confidence: 96%

An unusual microbial-rostroconch assemblage from the Mulde Event (Homerian, middle Silurian) in Podolia, Western Ukraine

Jarochowska

Munnecke

Kozłowski

2014

GFF

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The Homerian (middle Silurian) Mulde Event is an extinction event affecting hemipelagic organisms associated with a positive stable carbon isotope excursion, and an increased proliferation of microbial deposits. The Event is recorded in the Bagovytsya section (Podolia, Ukraine), representing a carbonate ramp setting in the East European Craton, and recording the d 13 C carb excursion with values reaching þ 5.17%. The associated facies include oncolitic beds, mud-mounds and thrombolitic buildups dominated by cyanobacteria and microproblematica with proposed bacterial affinities. The associated faunal assemblage includes a high proportion of rostroconchs and abundant gastropods and trilobites. The co-occurrence of grazing organisms and microbial sediments suggests that the microbial preservation was not caused by decreased grazing rates.

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ThelundgreniExtinction Event: Integration of paleontological and geochemical data from Arctic Canada

Cited by 34 publications

References 16 publications

Early Silurian positive δ¹³C excursions and their relationship to glaciations, sea‐level changes and extinction events

Early Silurian positive δ¹³C excursions and their relationship to glaciations, sea‐level changes and extinction events

Upper Homerian (Silurian) high-resolution correlation using cyclostratigraphy: an example from western Lithuania

An unusual microbial-rostroconch assemblage from the Mulde Event (Homerian, middle Silurian) in Podolia, Western Ukraine

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ThelundgreniExtinction Event: Integration of paleontological and geochemical data from Arctic Canada

Cited by 34 publications

References 16 publications

Early Silurian positive δ13C excursions and their relationship to glaciations, sea‐level changes and extinction events

Early Silurian positive δ13C excursions and their relationship to glaciations, sea‐level changes and extinction events

Upper Homerian (Silurian) high-resolution correlation using cyclostratigraphy: an example from western Lithuania

An unusual microbial-rostroconch assemblage from the Mulde Event (Homerian, middle Silurian) in Podolia, Western Ukraine

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Early Silurian positive δ¹³C excursions and their relationship to glaciations, sea‐level changes and extinction events

Early Silurian positive δ¹³C excursions and their relationship to glaciations, sea‐level changes and extinction events