On the discovery and study of anthraxolite in Triassic plagiorhyolite on the border of the Ural and western Siberia

Erokhin, Yu. V.; Ivanov, K. S.

doi:10.1007/s12303-018-0030-3

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Anthraxolite is not common but can be found all over the planet. Dubanský [7] reports globular uranium-free bitumens from the eastern part of Germany with high 12 C/ 13 C ratio (91.9-92.9), Erokhin et al [8] described anthraxolites from the border of the Ural and western Siberia, other authors report anthraxolites from South China [9] and northern Minnesota [10]. Anthraxolite is sometimes compared to shungite [11].…”

Section: Other Occurrences Of Anthraxolitementioning

confidence: 99%

Anthraxolite-Uranium Mineral: Composition, Structural Features and Genesis

Straka

2020

AMMS

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The most common uranium minerals are uraninite, coffinite and ningyoite. From a mineralogical point of view, anthraxolite is particularly interesting because it is a mixture of bitumen, uraninite and a small amount of coffinite while its composition has been significantly influenced by radiation metamorphism. As a mineral, it is light, hard, crumble, black in color with a brownish cut, matte sheen and a conchoidal fracture. Anthraxolite is always bound to the accumulation of uraninite, often metasomatically replacing uraninite. In the case of uranium deposit in Příbram, Czech Republic, the anthraxolite formation is the result of the transformation of organic matter into bitumens in the sediments of the Upper Proterozoic and Lower Cambrian, mobilization and transport of these bitumens by hydrothermal fluids into uranium deposit, and -after incorporation of uraninite particles / fragments -the radiation effect of uranium radionuclides causing the polycondensation of aromatic hydrocarbons in the bituminous mass and a change in its properties.

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Section: Other Occurrences Of Anthraxolitementioning

confidence: 99%

Anthraxolite-Uranium Mineral: Composition, Structural Features and Genesis

Straka

2020

AMMS

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Permian-Triassic ﬂood basalts in the pre-Jurassic basement of the Arctic zone of the West Siberian platform

et al. 2022

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Research subject. Permian-Triassic ﬂood basalts in the basement of the Arctic zone of the West Siberian Platform locate mainly in graben-rift structures. Flood basalts in this region remain to be understudied in comparison with other areas of its distribution, mainly due to the signiﬁcant depth of their occurrence (4–6 km).Materials and methods. 36 core samples from 11 superdeep and deep boreholes were studied. Isotopic ratios were measured on mass spectrometers NEPTUNE PLUS (Nd, Sm) and TRITON PLUS (Rb, Sr). Bitumen were studied using a Raman spectrometer LabRAM HR800 Evolution. The Raman spectra were deconvoluted (“Peak ﬁtting” procedure), and the bitumen conversion temperature was estimated.Results. About half of the samples of volcanic rocks underwent metamorphism of the prehnite-pumpellite and locally greenschist facies or intense low-temperature hydrothermal alteration. The studied basalts are close to typical ﬂood basalts and are somewhat similar to island-arc volcanic rocks in terms of their geochemical characteristics. For the ﬁrst time, thin inclusions of bitumen were found in the amygdalae of Permian-Triassic basalts in the superdeep borehole Tyumenskaya SG-6 at a depth of 7310.6 m. A high similarity of the studied volcanics by geochemical characteristics and the isotopic composition of Sr and Nd with the ﬂood basalts of the Siberian platform is shown.Conclusions. The presence of a negative Ta, Nb, Ti anomaly, as well as a negative Ce anomaly, in some of the analyzed samples indicates a possible contamination of the basalts by island arc volcanics and volcanogenic-sedimentary rocks. The temperature of transformation of bitumen in inclusions in basalts from the well Tyumenskaya SG-6 according to Raman spectroscopy is estimated at 150–300°C and generally corresponds to the temperature of metamorphism of the host basalts. The presence of bitumen in the amygdalae may indicate the migration of hydrocarbons through the basalts.

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On the discovery and study of anthraxolite in Triassic plagiorhyolite on the border of the Ural and western Siberia

Cited by 2 publications

References 11 publications

Anthraxolite-Uranium Mineral: Composition, Structural Features and Genesis

Anthraxolite-Uranium Mineral: Composition, Structural Features and Genesis

Permian-Triassic ﬂood basalts in the pre-Jurassic basement of the Arctic zone of the West Siberian platform

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