New Ore Minerals from the Kingash Ultramafic Massif, Northwestern Eastern Sayan

2017 ◽  
Vol 59 (7) ◽  
pp. 626-631 ◽  
Author(s):  
A. N. Yurichev ◽  
A. I. Chernyshov
Keyword(s):  
Ultramafic Massif ◽  
Ore Minerals ◽  
Eastern Sayan

Gold and silver accessory minerals in ultramafites of the Kyzyr-Burlyuksky ultramafic massif (Western Sayan)

2022 ◽  
pp. 109-120
Author(s):  
Alexey Yurichev
Keyword(s):  
Low Temperature ◽  
Ultramafic Rocks ◽  
Natural Setting ◽  
Accessory Minerals ◽  
Ultramafic Massif ◽  
Ore Minerals ◽  
Native Silver ◽  
Temperature Transformation ◽  
Western Sayan ◽  
Epigenetic Processes

The study focuses on gold and silver accessory minerals (native silver, cuprous gold, luanheite (Ag3Hg), unspecified mineral phase (Cu,Ag,Hg), first diagnosed in dunites and apodunite serpentinites of the Kyzyr-Burlyuksky ultramafic massif, which is part of the Kurtushibin ophiolite belt of Western Sayan. The revealed ore minerals are mainly observed in the form of single hypidiomorphic, irregular microscopic precipitates (0.5– 3.0 μm) mainly inside magnetite, much less often in grains of avaruite. Typomorphic and chemical features of ore minerals, their natural setting in rock-forming silicate matrix are characterized. Formation and concentration of these accessory minerals is associated with superimposed low-temperature transformation (hydration) processes affecting original ultramafic rocks. At the same time, the presence of luanheite and an unnamed phase (Cu,Ag,Hg), along with the previously identified potarite (PdHg), is probably evidence of low-temperature conditions of mineral formation during the manifestation of epigenetic processes of serpentinization (lowgrade metamorphism) due to solutions enriched in mercury. The source of such solutions could be gabbro intrusions that penetrated later into the main ultramafic body.

ACCESSORY SULPHIDES AND ARSENIDES FROM CHROMYTITES OF KHARCHERUZ ULTRAMAFIC MASSIF, THE POLAR URALS

2021 ◽  
pp. 54-64
Author(s):  
Alexey Yurichev
Keyword(s):  
Sulfide Mineralization ◽  
Polar Urals ◽  
Ophiolite Belt ◽  
The North ◽  
Ultramafic Massif ◽  
Ore Minerals ◽  
The Polar Urals

The study is focused on accessory sulfide mineralization revealed in massive chromitites of Kharcheruz ultramafic massif, which is part of the Khadatinsky ophiolite belt closing ophiolite complexes of the Polar Urals in the north. Three paragenetic associations of accessory sulfides associated with various processes of host chromitites formation and transformation are identified. Typomorphic and chemical features of ore minerals are characterized.

scholarly journals Gemological and mineralogical-petrographic study of the Eastern Sayan serpentinites

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.

Spectrographic Studies on Some Ore Minerals (Part 1)

1958 ◽  
Vol 3 (6) ◽  
pp. 693-701
Author(s):  
Kiyoshi Takimoto ◽  
Taneo Minato
Keyword(s):  
Ore Minerals

To the lichen flora of Oka Plateau (Eastern Sayan, Republic of Buryatia)

2009 ◽  
Vol 43 ◽  
pp. 229-245 ◽  
Author(s):  
I. N. Urbanavichene ◽  
G. P. Urbanavichus
Keyword(s):  
Lichen Species ◽  
Southern Siberia ◽  
Eastern Sayan ◽  
First Time ◽  
Lichen Flora

New data on the distribution of 329 lichen species in Oka Plateau (Eastern Sayan, Southern Siberia, Republic of Buryatia) are presented. 7 species are reported for the first time for lichen flora of Russia: Leptogium furfuraceum, Melanelixia villosella, Myxophora leptogiophila, Pachyphiale ophiospora, Physcia cf. integrata, Polycoccum clauzadei, Stigmidium psorae. 14 species are recorded for the first time to Southern Siberia: Arthonia clemens, Bacidina delicata, Caloplaca saxifragarum, Lecidea septentrionalis, Leciophysma finmarkicum, Leptogium intermedium, Phaeosporobolus alpinus, Rhizocarpon frigidum, Rinodina metaboliza, R. olivaceobrunnea, Tetramelas chloroleucus, T. phaeophysciae, Weddellomyces tartaricola, Xanthoria stiligera. The records of Myxophora leptogiophila, Pachyphiale ophiospora, Polycoccum clauzadei, Stigmidium psorae, Weddellomyces tartaricola are the first to Asia.

Georadar Monitoring of the Peretolchin Glacier (Eastern Sayan)

2020 ◽  
Vol 41 (3) ◽  
pp. 278-283
Author(s):  
A. D. Kitov ◽  
E. V. Serebryakov ◽  
A. S. Gladkov ◽  
O. V. Lunina ◽  
V. M. Plyusnin ◽  
...  
Keyword(s):  
Eastern Sayan

scholarly journals Characterization and mapping of hematite ore mineral classes using hyperspectral remote sensing technique: a case study from Bailadila iron ore mining region

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Ibrahim Shaik ◽  
S. K. Begum ◽  
P. V. Nagamani ◽  
Narayan Kayet
Keyword(s):  
Infrared Absorption ◽  
Near Infrared ◽  
Spectral Feature ◽  
Absorption Feature ◽  
X Ray ◽  
Remote Sensing Technique ◽  
Ore Minerals ◽  
Feature Fitting ◽  
Hematite Ore

AbstractThe study demonstrates a methodology for mapping various hematite ore classes based on their reflectance and absorption spectra, using Hyperion satellite imagery. Substantial validation is carried out, using the spectral feature fitting technique, with the field spectra measured over the Bailadila hill range in Chhattisgarh State in India. The results of the study showed a good correlation between the concentration of iron oxide with the depth of the near-infrared absorption feature (R2 = 0.843) and the width of the near-infrared absorption feature (R2 = 0.812) through different empirical models, with a root-mean-square error (RMSE) between < 0.317 and < 0.409. The overall accuracy of the study is 88.2% with a Kappa coefficient value of 0.81. Geochemical analysis and X-ray fluorescence (XRF) of field ore samples are performed to ensure different classes of hematite ore minerals. Results showed a high content of Fe > 60 wt% in most of the hematite ore samples, except banded hematite quartzite (BHQ) (< 47 wt%).

The first data on breithauptite in chromitite from the northern part of the Voykar–Synya ultramafic massif (Polar Urals)

2017 ◽  
Vol 477 (1) ◽  
pp. 1363-1367
Author(s):  
R. I. Shaibekov ◽  
M. M. Gaikovich ◽  
S. I. Isaenko ◽  
S. S. Shevchuk
Keyword(s):  
Polar Urals ◽  
Ultramafic Massif
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