A Model of the Accumulation of Radiolarite Layers in the Bazhenov Formation of West Siberia

Khotylev, O. V.; Balushkina, Natalia; Vishnevskaya, V. S.; Коробова, Н. И.; Калмыков, А. Г.; Roslyakova, A. S.

doi:10.3103/s0145875219020054

Cited by 10 publications

(4 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Algal blooms happen regularly in the Black and the Mediterranean Seas [72,73]. The source of nutrients in the middle of the paleosea potentially stimulating algal blooms could be volcanic ash [74][75][76], eolian processes [77][78][79], upwelling [80], or run-off from the eroding land areas, and currents, concentrating stock of living plankton. The occurrence of a large amount of quartz in the alginite-rich layers is associated with the release of silica or input from an external source.…”

Section: Origin Of the Alginite-rich Layersmentioning

confidence: 99%

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

et al. 2021

View full text Add to dashboard Cite

In this study, we identified the luminescent layers containing a significant amount of alginite in the Upper Jurassic–Lower Cretaceous Bazhenov Formation named “the alginite-rich layers”. Lithological and geochemical methods were used to determine distinctive features of these layers and to evaluate their impact on the total petroleum generation potential of the Bazhenov Formation. We have shown that the composition of the alginite-rich layers differs significantly from the organic-rich siliceous Bazhenov rocks. Rock-Eval pyrolysis, bulk kinetics of thermal decomposition, elemental analysis, and the composition of pyrolysis products indicate type I kerogen to be the predominant component of the organic matter (OM). Isotope composition of carbon, nitrogen, and sulfur was used to provide insights into their origin and formation pathways. The luminescent alginite-rich layers proved to be good regional stratigraphic markers of the Bazhenov Formation due to widespread distribution over the central part of Western Siberia. They can also be applied for maturity evaluation of the deposits from immature to middle of the oil window, since the luminescence of the layers changes the color and intensity during maturation.

show abstract

Section: Origin Of the Alginite-rich Layersmentioning

confidence: 99%

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Member 1 is comprised of mainly organic‐lean siliceous shale. Member 2 consists mainly of dark grey siliceous shales with interlayers of radiolarites (Khotylev et al., 2019). A radiolarite is a siliceous sedimentary rock formed by accumulating abundant skeletons of radiolarians.…”

Section: Geological Settingsmentioning

confidence: 99%

Provenance and the U–Pb age constraints on the tuff beds of the Late Jurassic–Early Cretaceous Bazhenovo Formation, West Siberian Basin

Bulatov,

Yermakov,

Kulikova

et al. 2024

The Depositional Record

View full text Add to dashboard Cite

Thin tuff beds of the Late Jurassic–Early Cretaceous Bazhenovo Formation are laterally widespread in the central part of the West Siberian Basin (ca 0.5 million km2). However, the source of the tuff beds remains unclear. The stratigraphy, geochemistry and geochronology of the tuff beds were investigated to reveal their magmatic origin and potential source region. Most of the tuff beds are recorded in member 4 and can be correlated through the Bazhenovo sequence. Thin‐section petrography and X‐ray diffraction indicate that the tuffs mostly comprise clay minerals and K‐feldspars. Less common minerals are plagioclase, quartz and pyrite. The geochemical composition of the Bazhenovo tuff beds suggests a parental magma origin of andesite/basalt, which came from volcanic arc‐related settings. Considering the results of geochemical studies along with LA‐ICP‐MS zircon U–Pb dating (141.3 ± 0.3/2.8 Ma), the palaeovolcanoes of the Caucasus region or south‐east Mongolia–North‐East China are one of the potential source regions of the tuffs. The record of these tuffs indicates the intensive volcanic eruption during the Volgian–Ryazanian, accompanied by a very low‐sedimentation rate and preservation in a reducing environment. The tuff beds have broad implications as an isochronous marker horizon and constraints for the numerical age of the Jurassic–Cretaceous boundary in the Boreal Realm.

show abstract

“…It should be noted that the onset of the studied interval of black-shale deposition across the Jurassic-Cretaceous boundary coincides with a shift from abiotic to biotic control on evolution of calcareous plankton (Eichenseer et al 2019). Among the other biotic factors, radiolarian blooms should also be considered as regionally responsible for black-shale deposition, that is, for the Bazhenov Formation of the Western Siberia (Khotylev et al 2019). Moreover, mass occurrences of radiolarians were also considered as very important for deposition of the Late Devonian black shales in European Russia (Afanasieva & Mikhailova, 2001) However, among the studied Upper Jurassiclowermost Cretaceous successions with black shale abundance, there are very few showing mass occurrence of radiolarians.…”

mentioning

confidence: 97%

“…Enhanced productivity of high-latitude basins may have had a significant influence on black shale deposition. Some intervals of the Bazhenovo Formation are so enriched by radiolarians (Khotylev et al 2019) that they are considered here as rockbuilding, while other intervals consist mainly of calcareous nannoplankton (Zanin et al 2012). However, silicites, typical of the Bazhenovo Formation, rarely occur outside of Western Siberia.…”

mentioning

confidence: 97%

Late Jurassic – earliest Cretaceous prolonged shelf dysoxic–anoxic event and its possible causes

2020

View full text Add to dashboard Cite

The Late Jurassic – earliest Cretaceous time interval was characterized by a widespread distribution of dysoxiс–anoxiс environments in temperate- and high-latitude epicontinental seas, which could be defined as a shelf dysoxic–anoxic event (SDAE). In contrast to black shales related to oceanic anoxic events, deposits generated by the SDAE were especially common in shelf sites in the Northern Hemisphere. The onset and termination of the SDAE was strongly diachronous across different regions. The SDAE was not associated with significant disturbances of the carbon cycle. Deposition of organic-carbon-rich sediment and the existence of dysoxic–anoxic conditions during the SDAE lasted up to c. 20 Ma, but this event did not cause any remarkable biotic extinction. Temperate- and high-latitude black shale occurrences across the Jurassic–Cretaceous boundary have been reviewed. Two patterns of black shale deposition during the SDAE are recognized: (1) Subboreal type, with numerous thin black shale beds, bounded by sediments with very low total organic carbon (TOC) values; and (2) Boreal type, distinguished by predominantly thick black shale successions showing high TOC values and prolonged anoxic–dysoxic conditions. These types appear to be unrelated to differences in accommodation space, and can be clearly recognized irrespective of the thickness of shale-bearing units. Black shales in high-latitude areas in the Southern Hemisphere strongly resemble Boreal types of black shale by their mode of occurrence. The causes of this SDAE are linked to long-term warming and changes in oceanic circulation. Additionally, the long-term disturbance of planktonic communities may have triggered overall increased productivity in anoxia-prone environments.

show abstract

A Model of the Accumulation of Radiolarite Layers in the Bazhenov Formation of West Siberia

Cited by 10 publications

References 2 publications

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

Alginite-Rich Layers in the Bazhenov Deposits of Western Siberia

Provenance and the U–Pb age constraints on the tuff beds of the Late Jurassic–Early Cretaceous Bazhenovo Formation, West Siberian Basin

Late Jurassic – earliest Cretaceous prolonged shelf dysoxic–anoxic event and its possible causes

Contact Info

Product

Resources

About