Cupriferous shales in Poland and their analogues in eastern parts of the USSR

Filin, A.M.; Bezrodnykh, Yu. P.; Trubachev, A. I.

doi:10.1080/00206817109475617

Cited by 3 publications

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confidence: 86%

“…This also is indicative of the existence of special conditions [10,2,3,7]. The acture deficit of moisture at low temperatures and the general difficulty of introducing and removing substances under these conditions inevitably limits the possible anions which can be formed by oxidation by the sulfate ions.…”

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confidence: 97%

“…Apart from physical breakdown, the rocks and minerals undergo chemical change, aided by seasonal freezing and thawing. The higher dissolved oxygen and carbon dioxide contents of the liquid phase, due to the lower temperatures, accelerate the decomposition.Chemical reactions are possible in frozen rocks because a chemically active film of water may still remain in the liquid state tens of degrees below zero [2,3]. The frozen ore and rock inevitably cause cryogenic concentration of the remaining solution.…”

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Possible heat effects during chemical decomposition and geotechnological leaching of sulfide ores and intermediate products

Pantsurkina¹

1991

Soviet Mining Science

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Several authors [1][2][3][4][5][6][7] have shown that contrary to previous ideas [8], rock which is frozen over many years is not a zone of chemical 'inactivity.' Apart from physical breakdown, the rocks and minerals undergo chemical change, aided by seasonal freezing and thawing. The higher dissolved oxygen and carbon dioxide contents of the liquid phase, due to the lower temperatures, accelerate the decomposition.Chemical reactions are possible in frozen rocks because a chemically active film of water may still remain in the liquid state tens of degrees below zero [2,3]. The frozen ore and rock inevitably cause cryogenic concentration of the remaining solution. The more the temperature of freezing is depressed, the lower the pH of the solution will become [9]. This leads to a further enrichment of the solution with oxygen, as the freezing front in the ore body separates from the analagous front at the rock wall. The separation of the fronts provides suitable conditions for the transfer of the oxygen, released by the crystallization of ice, to the unfrozen solution, where it can enter into oxidation of the sulfides in the ore body [3].A characteristic of the oxidation zone and the products of chemical decomposition in regions of prolonged freezing is the formation of highly soluble sulfate minerals, particularly of iron and copper. This also is indicative of the existence of special conditions [10,2,3,7]. The acture deficit of moisture at low temperatures and the general difficulty of introducing and removing substances under these conditions inevitably limits the possible anions which can be formed by oxidation by the sulfate ions.One possible factor contributing to the formation of sulfates is the exothermic heat of oxidation of the sulfides, which shifts the equilibrium and widens the conditions under which intergranular solutions can exist in the liquid state. The zone in which the exothermic reaction occurs acts as a secondary source of heat capable of creating a thermal anomaly, and can be a contributory cause of thawing [ii]. A study of the latter is important, not only for geochemical projects, but also for building operations in regions of long-term frozen ground.Experimental data on the heat of reaction of rocks (gabbro-diabase, diabase, kimberlite etc.) with concentrated sulfuric acid have been published [12]. For instance, kimberlite raised the temperature of the solution from -I~ to 50-70~In the present work, an attempt is made to evaluate the temperature effect resulting from the reaction of a solution of sulfuric acid with two rock samples. One was the technical sample No. T-8709 of the commercial refractory copper ore containing vallerite, from the Talnakhakii deposits, which are sulfidized and serpentinized dolerite. The second sample was waste slag from the liquid smelting of copper concentrates at the Noril'skii GMK. The materials were donated by V. V. Rybas of the Combine. The heat of reaction was calculated from experimental data.The thermodynamic characteristics of the minerals and particle...

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Possible heat effects during chemical decomposition and geotechnological leaching of sulfide ores and intermediate products

Pantsurkina¹

1991

Soviet Mining Science

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“…Pyrite constantly contains an admixture of cobalt (0.04-0.19 wt.%), less frequently nickel (up to 0.29 wt.%), and sometimes arsenic (0.32 wt.%). High Ag (0.17 wt.%) contents were determined in the bornite (Table S1, No 3,4). The mineralogical diversity of the ores of the Krasny deposit is also reflected in the sulfur isotopic composition (Table S2; points of analyses are shown in Figure 6).…”

Section: Deposits In Carbonate-terrigenous Rocksmentioning

confidence: 99%

“…Southern Siberia represents a huge Paleoproterozoic metallogenic province, one of the largest not only in Russia but also in the world [1][2][3][4][5]. It includes substantial copper deposits with varying amounts of silver, iron, vanadium, and other metals.…”

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Mineral and S-Isotope Compositions of Cu-Sulfide Deposits in Southern Siberia (Kodar–Udokan Region), Russia

Gongalsky,

Velivetskaya,

Taskaev

2024

Minerals

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The Kodaro–Udokan region is a huge Cu metallogenic province in Southern Siberia, one of the largest on Earth. It contains world-class copper sandstone-hosted Udokan (Cu reserves of 26.7 Mt) and PGE-Ni-Cu Chineysky deposits related to gabbro–anorthosite pluton (Cu—10 Mt; Fe-Ti-V, 30 Gt of ore). Furthermore, there are many small deposits of sulfide ores in sedimentary and igneous rocks in this region as well. For many decades, their genesis has been hotly debated. We studied the mineral composition and the sulfur isotopes in several deposits located at different levels of the stratigraphic sequence and in gabbro intruded in sandstones of the Udokan complex. The differences in ore compositions were found. The Burpala and Skvoznoy deposits consisting of the chalcocite–bornite association are characterized only by negative δ34S. The δ34S values for the Udokan deposits are mostly <0 (up to −28‰). The positive δ34S data characterize the ores of the Chineysky and Luktursky intrusions. Two Cu sandstone-hosted deposits are characterized by complex ore composition, i.e., the Krasny deposit, comprising chalcopyrite–pyrrhotite ores, is enriched in Co, Ni, Bi, Sb, Mo, Pb, Zn, Se, Te, and U and has a wide range of δ34S = −8.1–+13.5‰, and the Pravoingamakitsky deposit (Basaltovy section), consisting of quartz–chalcopyrite veins, has high PGE contents in ores with δ34S = +2.9–+4.0‰. These deposits are located near the gabbro massifs, and it is supposed that their ore compositions were influenced by magmatic fluids. The general regularities of the localization of the deposits in rift zones, and the proximity of mineral and isotopic composition allow us to conclude that the main source of copper could be rocks of basic composition because only they contain high Cu contents. Fluids from deep zones could penetrate to the surface and form Cu sandstone-hosted deposits.

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1980

Continental Red Beds

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Cupriferous shales in Poland and their analogues in eastern parts of the USSR

Cited by 3 publications

References 1 publication

Possible heat effects during chemical decomposition and geotechnological leaching of sulfide ores and intermediate products

Possible heat effects during chemical decomposition and geotechnological leaching of sulfide ores and intermediate products

Mineral and S-Isotope Compositions of Cu-Sulfide Deposits in Southern Siberia (Kodar–Udokan Region), Russia

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