scholarly journals GEOCHEMICAL CHARACTERISTICS OF NOVOKOSTIANTYNIVKA URANIUM DEPOSIT

2021 ◽  
pp. 3-11
Author(s):  
B.N. Ivanov ◽  
◽  
N.A. Donskoy ◽  
V.O. Syomka ◽  
S.M. Bondarenko ◽  
...  
Keyword(s):  
Rare Earth ◽  
Mineral Composition ◽  
Essential Feature ◽  
Apical Part ◽  
Vanadium Content ◽  
Geochemical Characteristics ◽  
Geochemical Anomalies ◽  
Survey Line ◽  
Geochemical Trend

Paper research aim is to identify characteristics of spacious distribution of radioactive- and associated elements in albitites according to depth and ore-level attribution: case study of 35th survey line of Novokostiantynivka deposit. Geochemical characteristics of Novokostiantynivka deposit are defined by presence of upper and lower ore-bearing levels. Geochemical anomalies related to upper ore-bearing level have complex character (uranium, thorium, lanthanum, yttrium, ytterbium, vanadium, and zirconium). At apical part of the deposit (Eastern fault) the albitites of blended type (chlorite, rybekite, aegerine) are dominant. La, Th, Y, and U define geochemical trend. These elements are likely to be related to rare-earth mineralization (monazite, apatite, xenotime), to a lesser extent to thorium and uranium mineralization with subordinate zircon. At deeper levels (Western fault) albitites’ mineral composition becomes more monotonous of rybekite-aegerine, and aegerine. The lead elements are Zr, Y, V, U, Th; Zr and Y noticeably dominate over other elements. Both elements and, maybe, part of U are related to zircon (malacon) which is predominant over rare-earth and thorium mineralization. Geochemical anomalies related to lower ore-bearing level are distinctive with monometallic (uranium) trend. The albitites of large column-like body have rybekite-aegerine, or aegerine mineral composition; phlogopite occurs often. Associated elements like Th, La, Y, Yb, V, Zr specific to albitites of upper ore level are not characteristic to deeper one. Based on seldom minor Th, La, and Y content spikes, rare-earth and thorium mineralization is immaterial. Regarding Zr and V, their contents are not over but most of the time less than background values. Apparently, zircon is not formed in albitites of lower ore-level; vanadium content in darkcolored minerals becomes insignificant, and single lead element is uranium. The most essential feature of Novokostiantynivka deposit is a succession of complex mineralization with monometallic one with depth.

China and the Geopolitics of Rare Earths

2017 ◽  
Author(s):  
Sophia Kalantzakos
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Resource Competition ◽  
Renewable Energy Sources ◽  
High Tech ◽  
Trade Dispute ◽  
Policy Responses ◽  
Economic Statecraft ◽  
The Rare Earth

In 2010, because of a geopolitical incident between China and Japan, seventeen elements of the periodic table known as rare earths became notorious overnight. An “unofficial” and temporary embargo of rare-earth shipments to Japan alerted the world to China’s near monopoly position on the production and export of these indispensable elements for high-tech, defense, and renewable energy sources. A few months before the geopolitical confrontation, China had chosen to substantially cut export quotas of rare earths. Both events sent shockwaves across the markets, and rare-earth prices skyrocketed, prompting reactions from industrial nations and industry itself. The rare-earth crisis is not a simple trade dispute, however. It also raises questions about China’s use of economic statecraft and the impacts of growing resource competition. A detailed and nuanced examination of the rare-earth crisis provides a significant and distinctive case study of resource competition and its spill-over geopolitical effects. It sheds light on the formulation, deployment, longevity, effectiveness, and, perhaps, shortsightedness of policy responses by other industrial nations, while also providing an example of how China might choose to employ instruments of economic statecraft in its rise to superpower status.

Geochemical characteristics and factors controlling the deep lithologic reservoirs in Puwei Sag, Dongpu Depression—A Case Study of Well PS20

2021 ◽  
Vol 203 ◽  
pp. 108669
Author(s):  
Sumei Li ◽  
Hong Ji ◽  
Zhonghua Wan ◽  
Xionqi Pang ◽  
Hongan Zhang ◽  
...  
Keyword(s):  
Geochemical Characteristics ◽  
Dongpu Depression

scholarly journals Tungsten Ores of the Dzhida W-Mo Ore Field (Southwestern Transbaikalia, Russia): Mineral Composition and Physical-Chemical Conditions of Formation

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 725
Author(s):  
Ludmila B. Damdinova ◽  
Bulat B. Damdinov
Keyword(s):  
Mineral Composition ◽  
Fluid Inclusions ◽  
Apical Part ◽  
Hydrothermal Fluids ◽  
True Temperature ◽  
Gangue Mineral ◽  
Mineral Formation ◽  
Physical Chemical ◽  
Homogenization Temperatures ◽  
Chemical Conditions

This article discusses the peculiarities of mineral composition and a fluid inclusions (FIs further in the text) study of the Kholtoson W and Inkur W deposits located within the Dzhida W-Mo ore field (Southwestern Transbaikalia, Russia). The Mo mineralization spatially coincides with the apical part of the Pervomaisky stock (Pervomaisky deposit), and the W mineralization forms numerous quartz veins in the western part of the ore field (Kholtoson vein deposit) and the stockwork in the central part (Inkur stockwork deposit). The ore mineral composition is similar at both deposits. Quartz is the main gangue mineral; there are also present muscovite, K-feldspar, and carbonates. The main ore mineral of both deposits is hubnerite. In addition to hubnerite, at both deposits, more than 20 mineral species were identified; they include sulfides (pyrite, chalcopyrite, galena, sphalerite, bornite, etc.), sulfosalts (tetrahedrite, aikinite, stannite, etc.), oxides (scheelite, cassiterite), and tellurides (hessite). The results of mineralogical and fluid inclusions studies allowed us to conclude that the Inkur W and the Kholtoson W deposits were formed by the same hydrothermal fluids, related to the same ore-forming system. For both deposits, the fluid inclusion homogenization temperatures varied within the range ~195–344 °C. The presence of cogenetic liquid- and vapor-dominated inclusions in the quartz from the ores of the Kholtoson deposit allowed us to estimate the true temperature range of mineral formation as 413–350 °C. Ore deposition occurred under similar physical-chemical conditions, differing only in pressures of mineral formation. The main factors of hubnerite deposition from hydrothermal fluids were decreases in temperature.

Transport and transformation of riverine neodymium isotope and rare earth element signatures in high latitude estuaries: A case study from the Laptev Sea

2017 ◽  
Vol 477 ◽  
pp. 205-217 ◽  
Author(s):  
Georgi Laukert ◽  
Martin Frank ◽  
Dorothea Bauch ◽  
Ed C. Hathorne ◽  
Marcus Gutjahr ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
High Latitude ◽  
Earth Element ◽  
Laptev Sea ◽  
Transport And Transformation ◽  
The Laptev Sea

Geochemical characteristics of rare earth elements in the surface sediments from the Spratly Islands of China

2017 ◽  
Vol 114 (2) ◽  
pp. 1103-1109 ◽  
Author(s):  
Jingxi Li ◽  
Chengjun Sun ◽  
Li Zheng ◽  
Xiaofei Yin ◽  
Junhui Chen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Surface Sediments ◽  
Geochemical Characteristics ◽  
Spratly Islands
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