Rare-earth minerals in carbonaceous shale of the Kumak gold deposit, South Urals, Russia

Snachev, A. V.; Panteleeva, A. V.; Rassomahin, M. A.

doi:10.17580/em.2023.02.01

2023

DOI: 10.17580/em.2023.02.01

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Rare-earth minerals in carbonaceous shale of the Kumak gold deposit, South Urals, Russia

A. V. Snachev,

A. V. Panteleeva,

M. A. Rassomahin

Abstract: Geochemical peculiarities of carbonaceous shalesThe ore-enclosing strata in the Kumak field represent mostly carbon-bearing siltstone and carbonaceous-clayey shale. The elemental composition features the increased contents of MgO (0.60-6.42%), TiO 2 (0.29-1.89%) and Al 2 O 3 (9.40-31.50%), and, accordingly, the increased hydrolyzate module (>0.55 units) and alumosilicic module (0.77 units, average 0.38 units). Lithochemically, they conform with siallite and super aluminum hydrolyzate rocks associated with resi… Show more

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2024

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Cited by 2 publications

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Rare earth mineralization in volcanic-sedimentary rocks of the Shatak complex (Southern Urals)

Kovalev,

Sharipova

2024

Geol. vestn.

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The paper presents materials on the study of rare earth mineralization in rocks of the Shatak complex, which belongs to the Mashak formation (RF2). Numerous rare earth minerals have been discovered and characterized in detail in terrigenous rocks, metabasalts and rhyodacites: allanite-(Ce), monazite-(Ce), monazite-(La), monazite-(Nd), nioboeschinite-(Y), aeshinite-(Y) , talenite-(Nd), talenite-(Dy), synchysite-(Ce), Ce–La–Fe oxide, cerite and unidentified compounds: yttrium silicate, cerium silicate, Ce–Fe compound, as well as REE-containing minerals: epidote and fluorapatite. In the contact zone between metabasalts and quartz sandstones, oxyfluoride – (La, Ce) (OnFm)3 mineralization, represented by compounds of variable composition, forming an isomorphic series: trifluoride (La, Ce)F3 – oxyfluoride (La, Ce)OF, is described for the first time in the world literature –oxide (La, Ce)2O3. It has been established that the determining factors in the formation of rare earth mineralization in the rocks of the Shatak complex are the conditions and nature of metamorphism and the chemistry of the mineral formation environment. The species diversity of rare earth minerals and the peculiarities of their chemical composition make the Shatak volcanic-sedimentary complex a unique object for studying the processes of rare earth mineral formation in various petrotypes of rocks formed in a single geotectonic setting and united by common thermobaric parameters of metamorphism.

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Rare earth mineralization in volcanic-sedimentary rocks of the Shatak complex (Southern Urals)

Kovalev,

Sharipova

2024

Geol. vestn.

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Gold and Platinum Group Element Occurrence Related to Black Shale Formations in the Southern Urals (Russia): A Review

Snachev,

Rassomakhin

2024

Minerals

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This paper gives a brief description of all structural–formational zones in the Southern Urals. Riphean and Paleozoic black shale sediments with strong positive anomalies of gold and a number of other elements are widely developed within this region. This paper reports that carbonaceous shales are a very favorable geochemical environment for the primary accumulation of many industrially important elements. Under certain conditions (in the areas of magmatism, zonal metamorphism, and tectonic activity), they can serve as a source of metals and concentrate deposits, with various occurrences of gold, silver, and platinoids. Among these deposits, a new type of vein-embedded gold–sulfide mineralization with dispersed gold and platinum metals, localized in rocks rich in organic carbon, has been detected. In this study, we made an attempt to summarize and systematize research materials on this issue. The presented data indicate a high potential of carbonaceous sediments in the Southern Urals, providing a good basis for further prospecting works and analytical studies.

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Rare-earth minerals in carbonaceous shale of the Kumak gold deposit, South Urals, Russia

Cited by 2 publications

References 25 publications

Rare earth mineralization in volcanic-sedimentary rocks of the Shatak complex (Southern Urals)

Rare earth mineralization in volcanic-sedimentary rocks of the Shatak complex (Southern Urals)

Gold and Platinum Group Element Occurrence Related to Black Shale Formations in the Southern Urals (Russia): A Review

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