scholarly journals Paleogeography of the Bazhenov formation of West Siberia according to the distribution of rare earth elements

2019 ◽  
Vol 488 (2) ◽  
pp. 181-184
Author(s):  
K. S. Ivanov ◽  
V. A. Volkov ◽  
N. V. Vakhrusheva
Keyword(s):  
Late Jurassic ◽  
West Siberia ◽  
Black Shales ◽  
Shale Oil ◽  
Independent Data ◽  
Bazhenov Formation ◽  
East Siberian Sea ◽  
Geochemical Study ◽  
Different Types ◽  
Deep Water Part

The Bazhenov formation is presented by the Late Jurassic black shales. Russia is on the first place on the reserves of “shale oil” that is mostly connected with the Bazhenov formation. For the reconstructions of sedimentation environments of the main types of the formation rocks the REE distributions have been used. The results point out to the formation of the Bazhenov deposits in relatively shallow environments - within the limits of inner and outer shelf of the epicontinental sea, the type of the Kara or East-Siberian Sea, relatively deep-water part of which is located north of the Latitudinal Priobye. These results confirm some previous estimates, but have been obtained on the base of quite different independent data. The geochemical study of different types of rocks of the Bazhenov formation gave the identical results that testify in favor of reliability of the results obtained.

scholarly journals Sedimentary basins of the East Siberian sea and the Chukchi sea region and the adjacent area of Amerasia basin: seismic stratigraphy and stages of geological history

2019 ◽  
pp. 3-26
Author(s):  
A. M. Nikishin ◽  
K. F. Startseva ◽  
V. E. Verzhbitsky ◽  
S. Cloetingh ◽  
N. A. Malyshev ◽  
...  
Keyword(s):  
Late Jurassic ◽  
Chukchi Sea ◽  
Sedimentary Cover ◽  
Tectonic Setting ◽  
Sedimentary Basins ◽  
Seismic Stratigraphy ◽  
Adjacent Area ◽  
Geological History ◽  
East Siberian Sea ◽  
Deep Water Part

Abstract The seismic stratigraphy scheme for the shelf basins of the East Siberian Sea and the Chukchi Sea region and the adjacent deep-water part of the Amerasia basin has been developed, and mega-sequences (or tectonostratigraphic units) with proposed age of 125100, 10080, 8066, 6656, 4645, 4534, 200 Ma are distinguished. Zhokhov foredeep basin of the Late Jurassic‒Neocomian age is distinguished between the New Siberia and De Long islands. Three main phases of rifting are identified on the shelves in the region with ages of 125100, 6656 and 4537 Ma. The main phase of continental rifting occurred in the Podvodnikov and Toll basins 125100 Ma. The typical clinoform accumulation of sediments occurred at the edge of the shelf 6620 Ma. We identified three syntectonic epochs of the formation of clinoform complexes with ages of 6645, 4534 and 3420 Ma. The phase of uplifting and compression in the region of Wrangel Island happened 66 Ma. The relatively monotonous tectonic setting with approximately the same thickness of the sedimentary cover began from 20 Ma.

Geothermy and zoning of shale oil prospects of the Koltogor-Urengoy paleorift (southeastern part of West Siberia)

2018 ◽  
Vol 40 (3) ◽  
pp. 54-80 ◽  
Author(s):  
V. I. Isaev ◽  
G. A. Lobova ◽  
V. V. Stotskiy ◽  
A. N. Fomin
Keyword(s):  
West Siberia ◽  
Shale Oil ◽  
Southeastern Part

Pyrite Morphology and Sulfur Isotope Composition in The Bazhenov Formation of West Siberia

2021 ◽  
Author(s):  
E. Idrisova ◽  
T. Karamov ◽  
A. Voropaev ◽  
R. Gabitov ◽  
N. Bogdanovich ◽  
...  
Keyword(s):  
Sulfur Isotope ◽  
Isotope Composition ◽  
West Siberia ◽  
Bazhenov Formation ◽  
Sulfur Isotope Composition

scholarly journals Highly Metalliferous Potential of Framboidal and Nodular Pyrite Varieties from the Oil-Bearing Jurassic Bazhenov Formation, Western Siberia

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 449
Author(s):  
Kirill S. Ivanov ◽  
Valery V. Maslennikov ◽  
Dmitry A. Artemyev ◽  
Aleksandr S. Tseluiko
Keyword(s):  
Oil And Gas ◽  
Massive Sulfide ◽  
Global Scale ◽  
Ore Deposits ◽  
Black Shales ◽  
Ural Mountains ◽  
Sulfide Deposits ◽  
Bazhenov Formation ◽  
Zn And Cu In ◽  
Positive Correlations

In the Bazhenov Formation, framboidal clusters and nodular pyrite formed in the dysoxic–anoxic interface within organic-rich sediments. Some nodule-like pyritized bituminous layers and pyrite nodules are similar to pyritized microbial mat fragments by the typical fine laminated structure. Framboidal pyrite of the Bazhenov Formation is enriched in redox-sensitive elements such as Mo, V, Au, Cu, Pb, Ag, Ni, Se, and Zn in comparison with the host shales and nodular pyrite. Nodular pyrite has higher concentrations of As and Sb, only. Strong positive correlations that can be interpreted as nano-inclusions of organic matter (Mo, V, Au), sphalerite (Zn, Cd, Hg, Sn, In, Ga, Ge), galena (Pb, Bi, Sb, Te, Ag, Tl), chalcopyrite (Cu, Se) and tennantite (Cu, As, Sb, Bi, Te, Ag, Tl) and/or the substitution of Co, Ni, As and Sb into the pyrite. On the global scale, pyrite of the Bazhenov Formation is very similar to pyrite from highly metalliferous bituminous black shales, associated, as a rule, with gas and oil-and-gas deposits. Enrichment with Mo and lower Co and heavy metals indicate a higher influence of seawater during formation of pyrite from the Bazhenov Formation in comparison to different styles of ore deposits. Transitional elements such as Zn and Cu in pyrite of the Bazhenov Formation has resulted from either a unique combination of the erosion of Cu–Zn massive sulfide deposits of the Ural Mountains from one side and the simultaneous manifestation of organic-rich gas seep activity in the West Siberian Sea from another direction.

scholarly journals Jurassic Non-Carbonate Microbialites from the Betic-Rifian Cordillera (Tethys Western End): Textures, Mineralogy, and Environmental Reconstruction

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 88
Author(s):  
Matías Reolid ◽  
Isabel Abad
Keyword(s):  
Hydrothermal Vents ◽  
Late Jurassic ◽  
Pillow Lava ◽  
Environmental Reconstruction ◽  
Sedimentary Deposits ◽  
Volcanic Deposits ◽  
Different Types ◽  
Mineralogical Compositions ◽  
Benthic Microbial Communities ◽  
Submarine Caves

The term microbialite is commonly applied for describing carbonate organo-sedimentary deposits that have accreted as a result of the activity of benthic microbial communities (BMC). However, non-carbonate microbialites are progressively well-known and show a great diversity of organisms, processes, and mineralogical compositions. This article reviews three types of Jurassic microbialites from four different environmental contexts from the Betic-Rifian Cordillera (South Spain and North Morocco): marine hardgrounds, submarine caves, hydrothermal vents, and submarine volcanic deposits. The Middle-Late Jurassic transition in the External Subbetic (Betic Cordillera) and the Jbel Moussa Group (Rifian Calcareous Chain) was characterized by the fragmentation of the carbonate epicontinental platforms that favored these different settings: (A) Many stratigraphic breaks are recorded as hardgrounds with surficial hydrogenetic Fe crusts and macro-oncoids related to chemo-organotrophic behavior of BMC that served as a specific trap for Fe and Mn enrichment; (B) Cryptic hydrogenetic Fe-Mn crusts (or endostromatolites) grew in the walls of submarine cavities and fractures mainly constituted by Frutexites (chemosynthetic and cryptobiontic microorganism) locally associated to serpulids; (C) Hydrothermal Mn crusts are mainly constituted by different types of filaments and bacillus-shaped bacteria, whose mineralogy and geochemistry point to a submarine hydrothermal origin; (D) Finally, glauconite laminated crusts, constituted by branched cylindrical filaments, have grown in cryptic spaces among the pillow-lava bodies, probably related to the metabolism of chemo-organotrophic microbes under oxic conditions at temperatures between 30 and 90 °C. In most of the cases described in this work, microbial organisms forming microbialites were extremophiles.

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