The development and extent of photic-zone euxinia concomitant with Woodford Shale deposition

Connock, Gregory T.; Nguyen, Thanh X.; Philp, R. Paul

doi:10.1306/0726171602017224

Cited by 27 publications

(7 citation statements)

References 69 publications

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“…The same situation was early reported for the Domanik Formation of the Timan-Pechora Basin (Bushnev et al, 2017b). Pr/Ph values ranging from 1 to 2 in combination with paleorenieratene and isorenieratene derivatives were recently reported (Connock et al, 2018), where some possible causes were discussed: thermal maturity, heterogeneous pristane and phytane source, pristane coelution, phytane structure binding into sulphur compounds as well as relatively short euxinic events during deposition. Thus, we assume other pristane source in Domanik Formation of the Timan-Pechora Basin and short time episodic euxinic events.…”

Section: Composition Of Organic Matter and Depositional Environmentssupporting

confidence: 74%

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Kotik

Журавлев

Maydl

et al. 2021

GeA

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Details of the Early-Middle Frasnian boundary interval of the Pymvashor River section (Timan-Pechora Basin, Cis-Urals, in the far north of European Russia) are revealed by biostratigraphically constrained carbonate (δ13Ccarb) and organic carbon (δ13Corg) stable data. The studied interval corresponds to the lower part of the Domanik Formation, which consists of interbedded limestone and shale beds. Organic-rich black shale that lacks bioturbation and benthic organisms indicates an oxygen-depleted depositional environment. Detection of isorenieratene derivatives in organic matter indicates that anoxia was present in the photic zone during deposition. The Pymvashor River section contains δ13Ccarb and δ13Corg isotope records related to the Early-Middle Frasnian isotope Event. The similarity between the Cis-Uralian (this study) and the Chinese δ13Ccarb and δ13Corg oscillations, including the twostep pattern of the recorded major positive excursions, suggests a robust correlation of the Late Devonian Early- Middle Frasnian isotope Event and minor intra-event excursions. Magnitude of variations and values of δ13Corg and δ13Ccarb in the punctata Zone in the Pymvashor River section are minor than those observed in the North American, Polish, and Chinese successions. Such difference may reflect specific variation of the local environments.

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Section: Composition Of Organic Matter and Depositional Environmentssupporting

confidence: 74%

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Kotik

Журавлев

Maydl

et al. 2021

GeA

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“…Isorenieratane is commonly either the lone or the dominant diaromatic C 40 carotenoid in Phanerozoic marine samples. The single exception is the enigmatic isomer paleorenieratane (XVI) which is sometimes the most abundant diaromatic C 40 carotenoid detected in early Paleozoic samples ( 23 , 44 ). Their cooccurrence and similar carbon isotopic compositions indicate that both paleorenieratane and isorenieratane represent a geochemical signature for brown-colored strains of GSB.…”

Section: Resultsmentioning

confidence: 99%

“…Biosynthetic studies, however, show that β-isorenieratene (IX) is a precursor to isorenieratene (XIII) in "brown-colored" strains of the GSB (29) and can be the predominant carotenoid in some taxa. Compound-specific carbon isotopic data for paleorenieratane (42)(43)(44) identify the GSB as the source because of the 13 C enrichment imparted by the reverse tricarboxylic acid cycle by which inorganic carbon is assimilated (45).…”

Section: Significancementioning

confidence: 99%

Niche expansion for phototrophic sulfur bacteria at the Proterozoic–Phanerozoic transition

Cui

Liu

Shen

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Fossilized carotenoid hydrocarbons provide a window into the physiology and biochemistry of ancient microbial phototrophic communities for which only a sparse and incomplete fossil record exists. However, accurate interpretation of carotenoid-derived biomarkers requires detailed knowledge of the carotenoid inventories of contemporary phototrophs and their physiologies. Here we report two distinct patterns of fossilized C40 diaromatic carotenoids. Phanerozoic marine settings show distributions of diaromatic hydrocarbons dominated by isorenieratane, a biomarker derived from low-light-adapted phototrophic green sulfur bacteria. In contrast, isorenieratane is only a minor constituent within Neoproterozoic marine sediments and Phanerozoic lacustrine paleoenvironments, for which the major compounds detected are renierapurpurane and renieratane, together with some novel C39 and C38 carotenoid degradation products. This latter pattern can be traced to cyanobacteria as shown by analyses of cultured taxa and laboratory simulations of sedimentary diagenesis. The cyanobacterial carotenoid synechoxanthin, and its immediate biosynthetic precursors, contain thermally labile, aromatic carboxylic-acid functional groups, which upon hydrogenation and mild heating yield mixtures of products that closely resemble those found in the Proterozoic fossil record. The Neoproterozoic–Phanerozoic transition in fossil carotenoid patterns likely reflects a step change in the surface sulfur inventory that afforded opportunities for the expansion of phototropic sulfur bacteria in marine ecosystems. Furthermore, this expansion might have also coincided with a major change in physiology. One possibility is that the green sulfur bacteria developed the capacity to oxidize sulfide fully to sulfate, an innovation which would have significantly increased their capacity for photosynthetic carbon fixation.

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“…Since the carbonate platform was presumably deposited under relatively shallower water than the Silicilyte, it seems possible that the isorenieratane found in the platform could be benthic microbial mats derived when the sediment‐water interface was sulfidic under reducing conditions. Comparatively, barely detectable isorenieratane in the deep basin deposits might be attributed to sharply diminishing light intensity to the deep depth where “brown strains” of GSB are competitive (Connock, Nguyen, & Philp, 2018), possibly due to light absorption by shallow water sulfur bacteria and shading by a dense oxygenic phototrophic community, as supported by the detection of steranes and hopanes. Another possibility is that the deep water was ferruginous that sulfide in the deep water has been scavenged by excessive iron (Fike & Grotzinger, 2010), suppressing the productivity of low‐light‐adapted GSB.…”

Section: Resultsmentioning

confidence: 99%

Biomarker stratigraphy in the Athel Trough of the South Oman Salt Basin at the Ediacaran‐Cambrian Boundary

2020

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The development and extent of photic-zone euxinia concomitant with Woodford Shale deposition

Cited by 27 publications

References 69 publications

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Early-Middle Frasnian (Late Devonian) carbon isotope Event in the Timan-Pechora Basin (Chernyshev Swell, Pymvashor River section, North Cis-Urals, Russia)

Niche expansion for phototrophic sulfur bacteria at the Proterozoic–Phanerozoic transition

Biomarker stratigraphy in the Athel Trough of the South Oman Salt Basin at the Ediacaran‐Cambrian Boundary

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