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Date submitted2022-03-03
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Date accepted2022-04-27
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Date published2022-07-26
Peculiarities of rare-metal mineralization and genetic relationship of mineral associations in the eastern rim of Murzinsko-Aduysky anticlinorium (the Ural Emerald Belt)
- Authors:
- Mikhail P. Popov
The paper presents features of the location and composition, as well as a generalization of data on the age of rare-metal mineralization developed at the deposits and occurrences of rare metals and gemstones in the eastern rim of Murzinsko-Aduysky anticlinorium, within the Ural Emerald Belt, which is a classic ore and mineralogical object and has been studied for almost two hundred years. With a significant number and variety of prospecting, research and scientific works devoted mainly to emerald-bearing mica complexes and beryl mineralization, as well as rare-metal pegmatites, scientific literature has so far lacked generalizations on the formation of numerous mineral associations and ore formations that represents a uniform genetic process in this ore district. The aim of the work is a comprehensive geological-mineralogical analysis of mineral associations of the eastern rim of Murzinsko-Aduysky anticlinorium and studying their age, formation conditions and characteristic features to determine the possibility of expanding and using the mineral resource base of the Urals through developing new prognostic and prospecting criteria for rare-metal and gemstone ore formations and creating the new devices for promising objects prospecting
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Date submitted2022-03-21
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Date accepted2022-06-15
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Date published2022-07-26
Ti-Fe-Cr spinels in layered (stratified) complexes of the western slope of the Southern Urals: species diversity and formation conditions
- Authors:
- Sergey G. Kovalev
- Sergey S. Kovalev
Materials on geochemistry and ore Fe-Ti-Cr mineralization of rocks composing layered (stratified) bodies of the western slope of the Southern Urals are presented. A detailed analysis showed similarity in the redistribution of REE, noble metals, and Fe-Ti-Cr mineralization of practically all parameters in rocks of the Misaelga and Kusin-Kopan complexes. It has been established that the parameters of metamorphism, which influenced components redistribution in Fe-Ti-Cr minerals of the layered complexes, correspond to Misaelga – T = <550-750 °С, P = 0.1-2.8 kbar, Kusin-Kopan – T = <550-630 °С, P = 0.3-0.7 kbar, and Shuidinsky complexes – T = <550-760 °С, P = 0.5-2.5 kbar. The result of modelling the melt crystallization process showed that the Kusin-Kopan complex is an intrusive body with an ultramafic horizon in the idealized cross-section. Due to collisional processes, the lower part of the intrusion has been detached from the upper part. The proposed structure of the Kusin-Kopan complex sharply increases its prospects for such types of minerals as platinum group minerals + sulphide copper-nickel mine-ralization and/or chromites.
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Date submitted2020-05-14
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Date accepted2020-10-05
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Date published2020-11-24
Fahlbands of the Keret archipelago, White Sea: the composition of rocks and minerals, ore mineralization
This paper presents a complex mineralogical and geochemical characteristic (based on SEM-EDS, ICP-MS analysis) of the fahlband rocks of the Kiv-Guba-Kartesh occurrence within the White Sea mobile belt (WSMB ). The term “fahlband” first appeared in the silver mines of Kongsberg in the 17th century. Now fahlbands are interlayers or lenses with sulfide impregnation, located in the host, usually metamorphic rock. The level of sulfide content in the rock exceed the typical accessory values, but at the same time be insufficient for massive ores . Fahlbands are weathered in a different way than the host rocks, so they are easily distinguished in outcrops due to their rusty-brown color. The studied rocks are amphibolites, differing from each other in garnet content and silicification degree. Ore mineralization is represented mainly by pyrrhotite and pyrite, and pyrrhotite grains are often replaced along the periphery by iron oxides and hydroxides, followed by pyrite overgrowth. At the same time, the rock contains practically unaltered pyrrhotite grains of irregular shape with fine exsolution structures composed of pentlandite, and individual pyrite grains with an increased Ni content (up to 5.4 wt.%). A relatively common mineral is chalcopyrite, which forms small grains, often trapped by pyrrhotite. We have also found single submicron sobolevskite and hedleyite grains. The REE composition of the fahlband rocks suggests that they are related to Archean metabasalts of the Seryakskaya and Loukhsko-Pisemskaya structures of the WSMB, rather than with metagabbroids and metaultrabasites common in the study area.
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Date submitted2018-07-04
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Date accepted2018-09-17
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Date published2018-12-21
Secondary dispersion halos as a prospecting indicator of platinum metal mineralization on the example of the Kamenushinsky massif (Middle Urals)
- Authors:
- A. M. Minibaev
The paper discusses the results of bulk rock geochemical sampling of the Kamenushinsky massif eluvial-deluvial deposits and the massifs bedrocks spectral analysis data. Evaluation of secondary dispersion halos using two-dimensional modeling and multivariate statistic processing of the results have allowed establishing the spatial collocation of platinum and chromium anomalies and high correlation between these elements. These facts confirm the considerable contribution of chromite-platinum mineralization to the primary ores of the entire Kamenushinsky massif. The geological observations and rocks chemical composition analysis has revealed that uranium and barium anomalies are associated with the areas of gabbro and granitoids dike bodies. The insignificant overlapping of uranium and barium anomalies with platinum and chromium ones, as well as the negative correlation between these two groups of elements, is inconsistent with earlier conclusions on the spatial association of platinum mineralization with gabbro and granitoids dikes and a possible connection between these dikes and platinum metal mineralization zones.
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Date submitted2008-10-05
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Date accepted2008-12-07
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Date published2009-12-11
Application of georadiolocation in hydrology
Georadiolocation is an effective tool to explore fresh water basins. When georadar is transported along the water surface by a small boat the bottom profile and the thickness of bottom sediments can be determined as well as sunk objects can be discovered. Investigation of a boundary between fresh and saline water in the estuaries of the rivers flown into the sea is a new field of georadars application. There is a possibility to determine damping factor, water electrical conductivity and, hence, water mineralization with the use of reflected signal amplitude.
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Date submitted1951-08-10
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Date accepted1951-10-03
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Date published1952-11-20
The influence of the specific gravity of groundwater on the conditions of its equilibrium and movement
- Authors:
- E. E. Kerkis
The issue of the influence of the specific gravity of groundwater on the conditions of its occurrence and movement is rather poorly covered in the literature. When studying fresh and slightly mineralized waters, their specific gravity is usually taken to be equal to 1, neglecting its minor changes depending on temperature, pressure and concentration of dissolved substances. However, when studying waters of increased mineralization (approximately starting with a total mineralization of 5-10 g / l) and especially brines, the increased specific gravity of water so strongly modifies the hydrodynamic conditions and affects the water level in wells (data used to determine the direction and speed of movement of groundwater), that conventional methods of calculations and constructions lead to gross errors and even complete distortion of reality. It is known that the presence of water of increased specific gravity in boreholes (caused by high mineralization or the content of suspended particles) leads to a decrease in the water levels in them, and to calculate the level corresponding to fresh clean water ("reduced level"), the following are introduced simple corrections. However, these corrections are still insufficient for calculating the movement of groundwater, which requires a significant modification of the usual filtration equations. The most difficult issue is determining the conditions of equilibrium, as well as the direction and speed of movement of groundwater with their variable specific gravity, especially when the specific gravity changes in the vertical and horizontal directions, which is usually observed in nature.