Ecosystem crisis at the Frasnian-Famennian boundary (Southern Timan)

Marshall, J.; Tel’nova, O. P.; Ветошкина, О. С.

doi:10.1134/s1028334x11100217

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Positive δ 13 C shifts are generally explained as a result of enhanced organic carbon burial or increased marine productivity. Positive shifts of the carbon isotope value near the F-F boundary were distinguished in the Timan-North Urals Region sections both in extremely shallow deposits of Southern Timan with a deviation of 4.5 ‰ [11], and in the deep-sea shelf deposits of the Subpolar Urals with a reference of 3.5 ‰ [21]. According to [21] un-steady eutrophic and oxygen-depleted ecosystems during the Frasnian-Famennian Event were intensified by various episodes of tectono-volcanic events in the closing Ural Ocean.…”

Section: Discussionmentioning

confidence: 94%

The Late Devonian Upper Kellwasser Event in the deep-water deposits of the western slope of the Subpolar Urals (Kozhym River section)

Soboleva¹,

Sobolev²

2019

Vestnik IG KomiSC

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The Upper Kellwasser Event is recognized for the first time in the deep-water succession of the Kozhym River section on the Western slope of the Subpolar Urals, based on conodont biostratigraphy, lithological changes and positive shifts of the carbon isotope value (δ 13 C) across the Frasnian-Famennian (F-F) boundary interval. Conodonts are abundant in the Frasnian Upper rhenana Subzone, but show a low diversity at the level of transgressive Upper Kellwasser Event in the linguiformis Zone, and are almost absent in the Famennian subperlobata Zone. Black shale horizons associated with the global Upper Kellwasser Event were identified in the linguiformis Zone in the Kozhym River section. Positive shifts in the carbon isotope ratio during the linguiformis Zone to the Lower triangularis Subzone (lower part) are observed, similar to those reported from elsewhere around the world (positive δ 13 C carb shifts ~ from 3 to 4 ‰). The data obtained allow the black shales associated with the Upper Kellwasser Event and carbon isotope fluctuations to be precisely dated and correlated.

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Section: Discussionmentioning

confidence: 94%

The Late Devonian Upper Kellwasser Event in the deep-water deposits of the western slope of the Subpolar Urals (Kozhym River section)

Soboleva¹,

Sobolev²

2019

Vestnik IG KomiSC

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“…NW Russia: (Avkhimovitch et al 1993). NW Russia (S Timan): (Tel'nova 2008; Marshall et al 2011). Bear Island, Spitsbergen: (Allen 1965;Kaiser 1970Kaiser , 1971Lopes et al 2021).…”

Section: Devonian Spores Of Arctic Canadamentioning

confidence: 99%

“…In addition to regional schemes, higher resolution palynological zonations have been developed within the Timan region (Fig. 1) includ-ing seven zones (PA-1 to PA-7) through the late Givetian to middle Frasnian interval (Tel'nova 2008), and a further four zones (PC-1 to PC-4) spanning the Frasnian/Famennian boundary (Marshall et al 2011).…”

Section: Devonian Spores Of Russiamentioning

confidence: 99%

“…This situation is present throughout much of the Timan (Obukhovskaya et al 2000). However, a science borehole at Sosnogorsk was drilled through a more complete Frasnian/Famennian boundary section that enabled the recognition of four palynocomplexes (PC 1-4), with the disappearance of characteristic Frasnian taxa occurring in PC-2 (Marshall et al 2011). In addition, the PC-2 assemblage was also characterized by the incoming of highly variable species, Grandispora pseudodeliquescens (Tel'nova and Marshall 2009).…”

Section: Fo Of Retispora Lepidophytamentioning

confidence: 99%

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Devonian palynoevents in the circum-Arctic region

Marshall

Mangerud

Bringué

et al. 2022

atlgeo

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Devonian strata of the present-day Arctic contain abundant and diverse assemblages of terrestrial palynomorphs, particularly from Middle and Upper Devonian sections; few intervals of Lower Devonian and Silurian strata have been palynologically studied, and these demonstrate strong palynofloral similarities across the region. Based on published records, we present a compilation of six last occurrence events (LOs), 44 first occurrence events (FOs) and one acme event that have proven of value in correlation in the present-day Arctic. Although their chronostratigraphic resolution is relatively low, and a scarcity of independent age control hampers precise age assignments, palynology is the only biostratigraphic discipline available for confident chronostratigraphic correlation of most Arctic Devonian strata.

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The ‘last’ tentaculitoids

Marshall

Tel’nova

2017

Palynology

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Ecosystem crisis at the Frasnian-Famennian boundary (Southern Timan)

Cited by 4 publications

References 3 publications

The Late Devonian Upper Kellwasser Event in the deep-water deposits of the western slope of the Subpolar Urals (Kozhym River section)

The Late Devonian Upper Kellwasser Event in the deep-water deposits of the western slope of the Subpolar Urals (Kozhym River section)

Devonian palynoevents in the circum-Arctic region

The ‘last’ tentaculitoids

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