Mamon stratum of the upper devonian of the Voronezh anteclise - new kaolin-bearing province

The lithofacies analysis of the Mamon showed showed that secondary kaolin deposits, forming a new kaolin-bearing province in the southern part of the Voronezh anteklise, are associated with a complex of deluvial-proluvial, lacustrine-boggy, and floodplain-oxbow deposits. The main ore minerals are kaolinite, quartz and secondary iron oxides and gibbsite. The presence of both terrigenous and autistic kaolinite was revealed. An important role in the formation of the latter, as well as gibbsite, played an organic substance.

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Frasnian age (upper devonian) key section biostratigraphic characteristic of Voronezh anteclise middle part (well 16, Schigry, Nizhnekrasnoe village, Kursky region)

Стратиграфия ◽

10.31857/s0869-592x27280-106 ◽

2019 ◽

Vol 27 (2) ◽

pp. 80-106

Author(s):

V. М. Nazarova ◽

L. I. Kononova ◽

T. А. Kulashova ◽

Е. L. Zaytseva

Keyword(s):

Middle Part ◽

Upper Devonian ◽

Stage Ii ◽

Voronezh Anteclise ◽

Regional Stage ◽

Conodont Zonation

Conodonts, scolecodonts, and foraminifers were studied from Frasnian age deposits of Well 16 Schigry (Nizhnekrasnoe village, Voronezh anteclise). Six conodont complexes are identified: I in Timan regional stage, II and III in Sargaevo regional stage, and IV and VI in Semiluky regional stage. Correlation by local zonal units and Standard Conodont Zonation is performed. Shallow environment is confirmed for Timan regional stage, the deepest environment settings is confirmed for Semiluky regional stage. Five scolecodont complexes are identified: complexes 1 and 2 for Sargaevo regional stage, complexes 3 and 4 for Semiluky regional stage, and complex 5 for the upper part of Semiluky regional stage and Voronezh regional stage. Foraminifers are presented by two complexes: first for Sargaevo regional stage and the second for the Semiluky regional stage. The characteristic microfossils species are given in plates.

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Biostratigraphic Characteristic of the Frasnian Age (Upper Devonian) Reference Section in the Central Voronezh Anteclise (Shchigry-16 Borehole, Nizhnekrasnoe Village, Kursk Oblast)

Stratigraphy and Geological Correlation ◽

10.1134/s0869593819020060 ◽

2019 ◽

Vol 27 (2) ◽

pp. 207-233 ◽

Cited By ~ 1

Author(s):

V. M. Nazarova ◽

L. I. Kononova ◽

T. A. Kulashova ◽

E. L. Zaytseva

Keyword(s):

Upper Devonian ◽

Voronezh Anteclise ◽

Kursk Oblast ◽

Reference Section

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New conodonts of the genus Polygnathus from the Evlanovian and Livnian (Upper Devonian) of the Voronezh Anteclise (central Devonian Field)

Paleontological Journal ◽

10.1134/s0031030110010090 ◽

2010 ◽

Vol 44 (1) ◽

pp. 68-78 ◽

Cited By ~ 2

Author(s):

E. M. Kirilishina ◽

L. I. Kononova

Keyword(s):

Upper Devonian ◽

Central Devonian Field ◽

Voronezh Anteclise

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Gemological and mineralogical-petrographic study of the Eastern Sayan serpentinites

Earth sciences and subsoil use ◽

10.21285/2686-9993-2021-44-1-48-55 ◽

2021 ◽

Vol 44 (1) ◽

pp. 48-55

Author(s):

A. A. Anisimova

Keyword(s):

Iron Oxides ◽

Microscopic Examination ◽

Research Laboratory ◽

Thin Sections ◽

Bluish Green ◽

Ore Minerals ◽

Eastern Sayan ◽

The Moment ◽

Dark Green ◽

Petrographic Study

The purpose of the research is to study the mineralogical and petrographic characteristics of the Eastern Sayan serpentinites in order to identify their most decorative varieties. The objects of the study are the samples of serpentinites from the Ulan-Khodinskoye and Khokhurtovskoye deposits of the Eastern Sayan. Six samples were studied macroscopically then polished plates were made from them for gemological examination and thin sections for microscopic examination. All studies were carried out using standard gemological methods at the Gemmology Research Laboratory of the Irkutsk National Research Technical University. The petrographic study of thin sections was carried out using an Axio Lab A1 microscope. Macroscopically, two main ornamental varieties of serpentinite were identified: spotted bluish-green serpentinite and massive serpentinite of the color from dark green to black. The spotted structure of serpentinite is determined by numerous inclusions of ore minerals including magnetite and iron oxides. Its hardness is 4.5 on the Moh’s scale, its gloss is matte. The data on the main gemological characteristics of the samples corresponding to the results of already published studies of gem-quality serpentinites from other deposits were also obtained. Having analyzed the microstructure and mineral composition of the Eastern Sayan serpentinites, their correspondence to the spotty and massive decorative varieties of serpentinites from other Russian deposits was revealed. At the moment, this material is not duly appreciated, although it may well be used as a sculptural and jewelry-ornamental decorative stone.

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