C and Sr isotope chemostratigraphy of Vendian–Lower Cambrian carbonate sequences in the central Siberian Platform

Кочнев, Б. Б.; Pokrovsky, B. G.; Кузнецов, А. Б.; Marusin, Vasiliy V.

doi:10.1016/j.rgg.2018.05.001

Cited by 16 publications

(5 citation statements)

References 44 publications

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“…1b), which corresponds to the Shuram global anomaly (Melezhik et al, 2005(Melezhik et al, , 2009Pokrovsky and Buyakaite, 2015;Pokrovsky et al, 2006aPokrovsky et al, , 2006b) that, according to the latest data, began just after 571 Ma (Canfield et al, 2020) or 574 ± 4.7 Ma (Rooney et al, 2020). This anomaly is also traced in the internal regions of the Siberian Platform in the upper part of the Nepa Horizon (Kochnev et al, 2018). The uncon- The isotopic-geochemical data are after (Pelechaty, 1998;Petrov and Pokrovsky, 2020;Pokrovsky and Buyakaite, 2015;Rud'ko et al, 2015), stratigraphy is after (Chumankov et al, 2013;Petrov, 2018aPetrov, , 2018b, and paleontological data are after (Khomentovsky et al, 2004;Kochnev and Karlova, 2010;Leonov and Rud'ko, 2012;Moczydłowska and Nagovitsin, 2012;Sergeev et al, 2011;Vorob'eva and Petrov, 2020).…”

Section: Patom Basin and The Age Of Its Rocksmentioning

confidence: 87%

Representatives of the Miaohe Biota from the Ediacaran (Vendian) Pre-Shuram Strata of the Patom Highland, Siberia

Petrov

Воробьева

2022

Stratigr. Geol. Correl.

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The carbonaceous macrofossils which belong to multicellular algae and which were previously known from the younger (>570 Ma) Miaohe biota are found for the first time in the Lower Vendian (Middle Ediacaran, ~580 Ma) rocks of the Ura Formation of the Patom Basin in Siberia. The Ura macrofossils include phytoleims of unbranched ribbon-like thalli preserved on the surfaces of silty mudstones. Among the fossils, the species Liulingjitaenia alloplecta and Jiuqunaoella simplicis are identified. The features of their structure are considered. The in vivo forms of the organisms and their colonies are interpreted. It is shown that these organic macrofossils were a noticeable detritus-forming component of the Ura Basin. The Ura macrophytes coexisted with the Early Ediacaran microbiota and composed a common ecosystem of the paleobasin, which formed shortly before the Shuram event and was significantly transformed after it.

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Section: Patom Basin and The Age Of Its Rocksmentioning

confidence: 87%

Representatives of the Miaohe Biota from the Ediacaran (Vendian) Pre-Shuram Strata of the Patom Highland, Siberia

Petrov

Воробьева

2022

Stratigr. Geol. Correl.

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“…It is likely that the δ 13 C of carbonates and the δ 13 C of organic matter are related to each other (Schouten et al, 2000;Oehlert and Swart, 2014), and the presence of a negative carbon isotope excursion in carbonates in a rock succession section may indicate the occurrence of organic matter with strongly negative δ 13 C values. The Shuram-Wonoka isotope excursion has been recorded in Oman, in South Australia, in Death Valley in the USA, in South China (Lee et al, 2013;Cui et al, 2017;Gong and Li, 2020), and also in the Siberian Platform (Kochnev et al, 2018). Its age is estimated at about 580-561 Ma with a duration of not more than 10 Ma (Fig.…”

Section: Oil-source Rock Correlationmentioning

confidence: 99%

Geochemistry of Oils and Gases From the Verkhnechonskoye Field, East Siberian Basin: Application of Analytical Results to Reservoir Characterisation

Oblasov,

Goncharov,

Eftor

et al. 2024

Journal of Petroleum Geology

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A geochemical study was carried out on oil and gas samples from the Verkhnechonskoye field, located on the Nepa‐Botuoba Anteclise in the central‐southern part of the Siberian Platform. The goal of the study was to distinguish between fluids derived from the V10‐13 and B12 reservoir units in the Vendian (Neoproterozoic) Katanga and Nepa Formations and to identify the producing reservoir using geochemical data. The results of analyses of 12 oil and 13 associated gas samples from the two reservoirs showed that all the fluids have similar geochemical properties including: low Pr/Ph ratios (0.78‐1.00); a predominance of C29 over C27 and C28 steranes; a predominance of odd‐numbered C21‐C25 n‐alkylbenzenes over their even‐numbered homologues; the presence of 12‐ and 13‐methylalkanes; and a high relative abundance of tricyclic terpanes (cheilantanes). All these properties are consistent with those of the properties of petroleum from other fields on the Siberian Platform. The molecular and stable carbon isotope compositions of the oils and gases suggest that they were derived from marine organic matter with a high algal input deposited under reducing conditions. To date, specific source rocks which generated the oil and gas present at fields on the Nepa‐Botuaoba Anteclise have not conclusively been identified, but potential candidates include the Upper Riphean Iremeken and Ayan Formations and more probably the Vendian Zherbinskaya, Seralakh, Vanavara and Nepa Formations.The second part of the study demonstrates the application to reservoir geochemistry of C3‐ and C4‐ alkylbenzene compounds together with more conventional biomarkers. Key parameters were selected using statistical processing and displayed in graphic profiles. These profiles allowed the oil and gas samples to be classified according to the reservoir from which they were derived based on their geochemical properties. Parameters based on C3‐ and C4‐ alkylbenzene compounds were most effective in discriminating between oils from the two reservoirs. In addition, a new parameter is proposed based on the contents of 1‐methyl‐3‐isopropylbenzene, 1‐methyl‐2‐isopropylbenzene and 1‐methyl‐2‐propylbenzene; this parameter correlates closely with the pristane/phytane ratio and can be used as an additional indicator of the level of oxicity in the source rock depositional environment.

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“…; Kochnev et al . ), the sections there demonstrate depauperate diversity of small skeletal taxa and an ambiguous chemostratigraphical record. Possible explanations include limited sampling (most of the units are exposed as discrete outcrops) and considerable post‐depositional alteration of the rocks (Pelechaty ), minimizing preservation potential of carbonate shells and the original carbon‐isotope system.…”

mentioning

confidence: 89%

“…Salt‐bearing formations exhibit only local development in the Ediacaran in the central Siberian Platform (Kochnev et al . ).…”

mentioning

confidence: 97%

Resolving Terreneuvian stratigraphy in subtidal–intertidal carbonates: palaeontological and chemostratigraphical evidence from the Turukhansk Uplift, Siberian Platform

Marusin

Кочнев

Karlova

et al. 2019

LET

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Both diverse assemblages of small skeletal fossils and a representative chemostratigraphical record make the Siberian Platform widely regarded as one of the key regions for the reconstruction of global biotic and abiotic events in the late Ediacaran and early Cambrian. However, the wide distribution of intertidal–subtidal facies in the Ediacaran–Cambrian transitional strata of the central and southwestern Siberian Platform (Turukhansk–Irkutsk–Olekma facies region) produces a dramatic depletion of the palaeontological record and considerably limits their age‐calibration and long‐distance correlation. We report new lithological, palaeontological and carbonate carbon‐isotope data for the Ediacaran–Cambrian sections of the Turukhansk Uplift (northwestern Siberian Platform, western facies region). These data provide a robust framework for the chemostratigraphical correlation of the western facies region with sections of the transitional and eastern regions of the Siberian Platform and further confirms a depositional hiatus at the base of the Tommotian Stage in the stratotype section (Aldan River, SE Siberia). The carbon‐isotope curve from the Turukhansk Uplift sections correlates positively with the most chemostratigraphically representative Ediacaran–Cambrian sections (Siberia, Morocco, South China). It records major carbon‐isotope oscillations globally recognized in the lower Cambrian, enabling localization of the Fortunian and Cambrian Stage 2 boundaries in the Platonovskaya Formation. Although there is extreme paucity and poor preservation of the small skeletal fossils in the western facies region, we report individual Barskovia, Blastulospongia and chancelloriid sclerites from the Platonovskaya Formation. A combination of palaeontological and chemostratigraphical data suggests the base of P. antiqua Assemblage Zone is located in the middle Platonovskaya Formation. The earliest spiral gastropods probably occurred at ~541 Ma, as demonstrated by the discovery of a specimen of Barskovia near the base of the large negative excursion in the lower Platonovskaya Formation, correlated with the BACE negative carbon‐isotope peak in the sections of the Yangtze Platform.

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C and Sr isotope chemostratigraphy of Vendian–Lower Cambrian carbonate sequences in the central Siberian Platform

Cited by 16 publications

References 44 publications

Representatives of the Miaohe Biota from the Ediacaran (Vendian) Pre-Shuram Strata of the Patom Highland, Siberia

Representatives of the Miaohe Biota from the Ediacaran (Vendian) Pre-Shuram Strata of the Patom Highland, Siberia

Geochemistry of Oils and Gases From the Verkhnechonskoye Field, East Siberian Basin: Application of Analytical Results to Reservoir Characterisation

Resolving Terreneuvian stratigraphy in subtidal–intertidal carbonates: palaeontological and chemostratigraphical evidence from the Turukhansk Uplift, Siberian Platform

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