Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 54/Ч-92
Автор(ы) : Чупахин О. Н., Береснев Д. Г.
Заглавие : Нуклеофильная атака на незамещенный атом углерода азинов и нитроаренов - эффективная методология построения гетероциклических систем : обзор
Параллельн. заглавия :Nucleophilic attack on the unsubstituted carbon atoms of azines and nitroarenes as an efficient strategy for constructing heterocyclic systems
Место публикации : Успехи химии. - 2002. - Т. 71, N 9. - С. 803-818: схем. - ISSN 0042-1308. - ISSN 0042-1308
Примечания : Библиогр. : с. 817-818 (69 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Обобщены данные о новых методах синтеза конденсированных азинов с помощью нуклеофильной атаки на незамещенный атом углерода азинов и нитроаренов. Рассмотрены тандемы реакций нуклеофильного присоединения AN-AN, нуклеофильного присоединения-замещения AN-S(ipso)N, нуклеофильного замещения S(H)N-S(ipso)N и S(H)N-S(H)N, протекающих между азинами и бинуклеофилами; внутримолекулярные S(H)N-реакции в ряду азинов и нитроаренов, а также другие методы синтеза конденсированных гетероциклов, основанные на процессах нуклеофильного замещения типа S(H)N
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Вид документа : Статья из журнала
Шифр издания : 54/A 18
Автор(ы) : Itsikson N. A., Beresnev D. G., Rusinov G. L., Chupakhin O. N.
Заглавие : Acid-promoted direct C-C coupling of 1,3-diazines and 1,2,4-triazines with aryl-containing macrocyclic compounds and their open-chain analogues
Место публикации : ARKIVOC. - 2004. - № 12. - С. 6-13
Примечания : Библиогр. : с. 12 (13 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A method of direct C-C coupling of azahetarenes with macrocycles (calix[4]arene, benzo-12-??crown-4, 1,5-bis(2,6-dimethylphenoxy)-3-oxapentane), based on the nucleophilic addition to ??unsubstituted carbon atom in azines, has been developed.
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Вид документа : Статья из журнала
Шифр издания : 54/C 47
Автор(ы) : Charushin V. N., Chupakhin O. N.
Заглавие : Nucleophilic aromatic substitution of hydrogen and related reactions [Electronic resource]
Место публикации : Mendeleev Communications. - 2007. - Vol. 17, № 5. - С. 249-254
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0959943607001265
Примечания : 11.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The classical concept of nucleophilic aromatic substitution (SNAripso) has been complemented with a new synthetic methodology (SNH), enabling one to build new carbon–carbon C(sp2)–C(sp3), C(sp2)–C(sp2) and C(sp2)–C(sp) or carbon–heteroatom C(sp2)–X (X is O, N, P, S, halogen) bonds through nucleophilic displacement of hydrogen in an aromatic ring.
\\\\Expert2\\nbo\\Mendeleev Communications\\2007, v.17, p.249.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/K 66
Автор(ы) : Kodess M. I., Sosnovskikh V. Ya., Moshkin V. S.
Заглавие : Reactions of 3-(polyfluoroacyl)chromones with hydroxylamine : synthesis of novel R - containing isoxazole and chromone derivatives
Место публикации : Tetrahedron. - 2008. - Vol. 64, № 34. - С. 7877-7889: рис.
Примечания : Библиогр. : с. 7888-7889 (32 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reaction of 3-(polyfluoroacyl)chromones with hydroxylamine free base proceeds via nucleophilic 1,4-addition followed by opening of the pyrone ring and subsequent cyclization to 4-(polyfluoroalkyl)-4H-chromeno[3,4-d]isoxazol-4-ols in good yields. On treatment with trifluoroacetic acid, the isoxazole ring of this annulated heterocyclic system opens to give 3-cyano-2-(polyfluoroalkyl)chromones, which were successfully hydrolyzed with concentrated H2SO4 to afford 3-carbamoyl-2-(polyfluoroalkyl)chromones. On the other hand, oximation of 3-(polyfluoroacyl)chromones with hydroxylamine hydrochloride occurs either at the carbonyl carbon atom connected to the RF group or at the C-2 atom to give 3-RFC(NOH)-chromones and 5-RF-4-salicyloylisoxazole oximes, respectively. The former were easily converted to 3-RF-4-salicyloylisoxazoles by simple heating in dimethyl sulfoxide.??
\\\\Expert2\\nbo\\Tetrahedron\\2008, v. 64, N34, p. 7877.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/C 47
Автор(ы) : Charushin V. N., Chupakhin O. N.
Заглавие : S-N(H) methodology and new approaches to condensed heterocyclic systems
Место публикации : Pure and Applied Chemistry. - 2004. - Vol. 76, № 9. - С. 1621-1631: рис.
Примечания : Библиогр.: с. 1631 (70 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The review curveys the reactions of electron-deficient azaaromatic compounds with mono- and bifunctional nucleophilies in which a nucleophilic attack at the unsubstituted CH carbon of an aromatic ring is one of the key steps.Intramolecular S(N)H reactions will also be considered as effective synthetic tools to obtain condensed heterocyclic systems
\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Pure and Applied Chemistry\\2004, v.76, N 9, p.1621.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/H 10
Автор(ы) : Rykowski A., Chupakhin O. N., Kozhevnikov D. N., Kozhevnikov V. N., Rusinov V. L., Van der Plas H. C.
Заглавие : H-1 and C-13-NMR investigations on-adduct formation of 1,2,4-triazine 4-oxides and 3-chloro-6-phenyl-1,2,4-triazine with liquid ammonia and alkylamines
Место публикации : Heterocycles. - 2001. - Т. 55, № 1. - С. 127-133
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 1H- and 13C-NMR spectra of the ?-adducts formed between 6-phenyl-1,2,4-triazine 4-oxide (1a), 3-ethyl-6-phenyl-1,2,4-triazine 4-oxide (1b) and liquid ammonia, methylamine or dimethylamine are described, together with 1H NMR spectra of 3-chloro-6-phenyl-1,2,4-triazine (7) in liquid ammonia. The results of the NMR study have shown that the carbon C-5 in 1a-b and 7 is the preferred site for nucleophilic attack by liquid ammonia and alkylamines at low temperatures (from -75° to -20°C). The ?-adduct (5e) formed between 1a and dimethylamine at -75°C on heating to -20°C irreversibly converts to open-chain product (3a), via intermediary C-3 ?-adduct (6). The amination of 7 into 3-amino-6-phenyl-1,2,4-triazine (10) occurs via SN(AE) mechanism involving the isomerisation of the C-5 ?-adduct (8) into the C-3 ?-adduct (9) as confirmed by a 15N study with labeled liquid ammonia.
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Вид документа : Статья из журнала
Шифр издания : 54/D 62
Автор(ы) : Rusinov G. L., Beresnev D. G., Itsikson N. A., Chupakhin O. N.
Заглавие : Direct modification of benzoannelated crown ethers with 1,2,4-triazin-5(2H)-one moieties
Место публикации : Heterocycles. - 2001. - Т. 55, № 12. - С. 2349-2359
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A convenient method for one-step coupling of benzoannelated crown ethers with 1,2,4-triazinones based on the reaction of nucleophilic addition to unsubstituted carbon atom of the triazine ring has been worked out. It has been shown that the reaction of 3-substituted 1,2,4-triazin-5(2H)-ones (1) with benzocrown ethers (benzo-12-crown-4, benzo-15-crown-5, benzo-18-crown-6) in the presence of acetic or trifluoroacetic anhydride is accompanied by acylation of triazine ring and results in formation of 3-(1-acyl-5-oxo-1,4,5,6-tetrahydro-1,2,4-triazin-6-yl)benzocrown ethers (7-12). The latters were converted to 3-(5-oxo-2,5-dihydro-1,2,4-triazin-6-yl)benzocrown ethers (18-20) using two alternative routes: the elimination of acetic or trifluoroacetaldehyde or the deacylation followed by the oxidation of the 1,4,5,6-tetrahydro derivatives (13-15).
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Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Chupakhin O. N., Rusinov G. L., Beresnev D. G., Charushin V. N., Neunhoeffer H.
Заглавие : A simple one pot synthesis of condensed 1,2,4-triazines by using the tandem AN-SNipso and SNH-SNipso reactions
Место публикации : Journal of Heterocyclic Chemistry. - 2001. - Т. 38, № 4. - С. 901-907
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new synthetic approach to condensed 1,2,4-triazines based on using the tandem AN-SNipso and SNH-SNipso reactions has been developed. 5-Methoxy-3-penyl-l,2,4 1,2,4-triazine and its N1-methyl quaternary salt were found to react with C,N-, C,O- and N,N?-bifunctional nucleophiles (m-phenylenediamine, resorcinol, semicarbazide and ureas) into triazacarbazoles, benzofuro[2,3-e][1,2,4]-triazines, and 6-azapurine derivatives. In all cases nucleophiles attack first the unsubstituted C-6 carbon of the triazine ring, while the final stage is replacement of the methoxy group affording cyclization products.
\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Journal of Heterocyclic Chemistry\\2001.v.38.p.901.Chupachin.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/T 44
Автор(ы) : Chupakhin O. N., Rusinov G. L., Itsikson N. A., Beresnev D. G., Nikolaeva I. L., Burilov A. R., Konovalov A. I.
Заглавие : The first case of direct coupling of heterocycles with calixarenes. Reaction of resorcinarenes with 1,2,4-triazin-5(2H)-ones
Место публикации : Heterocyclic Communications. - 2004. - Vol. 10, № 1. - С. 15-18: ил.
Примечания : Библиогр.: с. 18 (8 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A convenient method for an one-step coupling of resorcinarenes with 3-R-1,2,4-triazin-5(2H)-ones, involving nucleophilic addition to the unsubstituted carbon atom C-6 of triazine ring, has been worked out.
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10.

Вид документа : Статья из журнала
Шифр издания : 54/N 64
Автор(ы) : Nikitin E. D., Popov A. P., Yatluk Yu. G.
Заглавие : Critical temperatures and pressures of 12 phthalates using the pulse-heating method
Место публикации : Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1326-1330
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The critical temperatures and pressures of phthalates with the straight side alkyl chains C6H4-1,2-[COO(CH2) nH]2 (n is from 1 to 11) as well as bis(2-ethylhexyl) phthalate have been measured. No literature data are available for the critical properties of phthalates. Since phthalates decompose at temperatures well below their critical temperatures, the method of pulse heating of a wire probe immersed into the liquid under study has been used. The method minimizes the effect of thermal decomposition because residence times are only from (0.035 to 1) ms. The experimental critical properties of phthalates have been compared with the values calculated using the group-contribution methods by Constantinou and Gani and Marrero and Gani ??
\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2006, v.51, p.1326.pdf
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11.

Вид документа : Статья из журнала
Шифр издания : 54/N 64
Автор(ы) : Nikitin E. D., Popov A. P., Yatluk Yu. G.
Заглавие : Critical-point measurements for phenylethanoic to 7-phenylheptanoic acids
Место публикации : Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1335-1338
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The critical temperatures and pressures of phenylalkanoic acids with a straight alkyl chain C6H5(CH2)nCOOH (n = 1 to 6) have been measured. The method of pulse heating of a wire probe placed into the substance under study has been used. The method minimizes the thermal decomposition because residence times are from (0.035 to 1) ms. An equation for the correlation of the critical pressures of phenylalkanoic acids with the number of CH2 groups between phenyl and carboxyl functional groups and molar mass has been obtained. The experimental critical constants of phenylalkanoic acids have been compared with the values calculated by the group-contribution methods of Constantinou and Gani and Marrero and Gani????
\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2006, v.51, p.1335.pdf
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания : 54/K 81
Автор(ы) : Krasnikova O., Andreikov E.
Заглавие : Thermooxidation of petroleum and coal tar pitch blends : доклад, тезисы доклада
Место публикации : Conference Carbon, Gyeongju, Korea, Juny3-July 7,2005 : Gyeongju, 2005
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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13.

Вид документа : Статья из журнала
Шифр издания : 54/G 37
Автор(ы) : Khudina O. G., Shchegol'kov E. V., Kodess M. I., Burgart Ya. V., Saloutin V. I., Chupakhin O. N.
Заглавие : Geometric isomerism in the series of fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones [Electronic resource]
Место публикации : Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2007. - Vol. 43, № 3. - С. 380-387
Систем. требования: http://www.springerlink.com/content/j07322lgx3816401/fulltext.pdf
Примечания : 28.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: According to the 1H, 13C, and 19F NMR data, fluoroalkyl-containing 1,2,3-trione 2-arylhydrazones in CDCl3 exist exclusively, while in (CD3)2CO preferentially, as isomers in which the acyl or aroyl group is involved in intramolecular hydrogen bond. The isomer structure was assigned on the basis of the chemical shifts of the carbonyl carbon atoms and fluorine atoms and carbon-fluorine spin-spin coupling constants J C-F. X-Ray diffraction data showed that 1,2,3-trione 2-arylhydrazones in crystal have the same structure as in CDCl3 solution. Quantum-chemical calculations were performed to rationalize predominant formation of 1,2,3-trione 2-arylhydrazone isomers with a free polyfluoroacyl group
\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2007, 43 (3), 380-387.pdf
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14.

Вид документа : Статья из журнала
Шифр издания : 54/N 64
Автор(ы) : Nikitin E. D., Popov A. M., Bogatishcheva N. S.
Заглавие : Vapor-Liquid Critical Properties of n-Alkylbenzenes from Toluene to 1-Phenyltridecane
Место публикации : Journal of Chemical & Engineering Data. - 2002. - Vol. 47, № 4. - С. 1012-1016
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: This paper gives experimental critical temperatures and pressures of 10 n-alkylbenzenes C6H5CnH2n+1 with the number of carbons in the side chain n = 1, 2, 4, 5, 6, 7, 8, 10, 11, and 13. n-Alkylbenzenes that are heavier than butylbenzene are thermally unstable at their critical points. The method of pulse heating of a wire probe placed into the liquid under study has been used. Residence times are from (0.01 to 1) ms. Equations for the correlation of the critical temperatures and pressures of n-alkylbenzenes with the number of carbon atoms in the side chain, molar mass, and normal boiling point have been obtained. The experimental critical constants of alkylbenzenes have been compared with the values calculated by the methods of Lydersen, Joback and Reid, and Constantinou and Gani
\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2002, v.47, p.1012.pdf
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15.

Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Ol'shevskaya V. A., Ayuob R., Brechko Z. G., Petrovskii P. V., Levit G. L., Krasnov V. P., Charushin V. N., Chupakhin O. N., Kalinin V. N.
Заглавие : Synthesis of carborane analogues of gamma-aminobutanoic acid
Место публикации : Journal of Organometallic Chemistry. - 2005. - Vol. 690, № 11. - С. 2761-2765
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: General method for preparation of high yields of novel N-protected carborane amino acid derivatives, 3-acylamino-1-carboxymethyl-2-R-o-carboranes (R = H, Me, Ph), is reported. The synthesis starts from readily available 3-amino-o-carboranes and includes the protection of amino group, introduction of carboxymethyl function to the carbon atom of polyhedron via the metallation of carborane CH bond with sodium amide in liquid ammonia, and treatment of corresponding sodium carboranes with sodium bromoacetate. Deprotection of N-acylated carborane amino acids is studied in acidic media. Depending on the procedure employed, closo- or nido-carborane amino acids were obtained
\\\\Expert2\\nbo\\Journal of Organometallic Chemistry\\2005, v. 690, p.2761.pdf
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16.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Zapevalov A. Ya., Filyakova V. I., Kodess M. I., Saloutin V. I.
Заглавие : Reaction of polyfluoro-3-chloro(bromo)-1-butenes with sodium hypohalites and properties of epoxides derived therefrom [Electronic resource]
Место публикации : Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2003. - Vol. 39, № 7. - С. 919-923
Систем. требования: http://www.springerlink.com/content/hh22743080t614wv/fulltext.pdf
Примечания : Bibliogr. : p. 923 (13 ref.). - 31.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Epoxidation of 3-chloro(bromo)heptafluoro-1-butenes and 3,4-dichlorohexafluoro-1-butene with aqueous solutions of sodium hypohalites is accompanied by cleavage of the carbon skeleton at the double bond and formation of polyfluorocarboxylic acid sodium salts as by-products. 3-Chloro(bromo)-1,2- epoxyheptafluoro- and 3,4-dichloro-1,2-epoxyhexafluorobutanes were synthesized and subjected to isomerization into carbonyl compounds by the action of cesium fluoride or antimony pentafluoride.
\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2003, 39 (7), 919.pdf
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17.

Вид документа : Статья из журнала
Шифр издания : 54/I-85
Автор(ы) : Filyakova T. I., Zapevalov A. Ya., Kodess M. I., Kurykin M.A., German L.S.
Заглавие : Isomerization of monohydroperfluoroalkenes [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1994. - Vol. 43, № 9. - С. 1526-1531
Систем. требования: http://www.springerlink.com/content/vp3621243236747u/fulltext.pdf
Примечания : 26.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Isomerization of monohydroperfluoro-1-alkenes HC(CF2)nCF=CF2 (n = 2 to 8) catalyzed by Lewis bases or acids (CsF, KHF2, and SbF5) under conditions of thermodynamic control affords equilibrium mixtures of all of the possible isomers resulting from migration of the double bond along the carbon chain. Under conditions of kinetic control, isomerization through the action of SbF5 gives -H-perfluoro-2-alkenes. The substantially higher proportion ofcis-isomers in the resulting monohydroperfluoroalkenes than in their perfluorinated analogs has been attributed to the effect of an intramolecular hydrogen bond
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1994, 43 (9), 1526.pdf
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18.

Вид документа : Статья из журнала
Шифр издания : 54/S 73
Автор(ы) : Sosnovskikh V. Ya., Usachev B. I., Kodess M. I.
Заглавие : 2-Polyfluoroalkylchromones. 12. Nitration of 5,7-dimethyl-2-polyhaloalkylchromones and complete assignment of signals in the 1H and 13C NMR spectra of 5,7-dimethyl-2-trifluoromethylchromone and its mono- and dinitro derivatives [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2002. - Vol. 51, № 10. - С. 1817-1828
Систем. требования: http://www.springerlink.com/content/j5142173317h7g17/fulltext.pdf
Примечания : 27.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The nitration of 5,7-dimethyl-2-polyhaloalkylchromones affords either 5,7-dimethyl-6-nitro- or 5,7-dimethyl-6,8-dinitro-2-polyhaloalkylchromones, depending on the reaction conditions. Signals in the 1H and 13C NMR spectra of the sterically hindered chromones were completely assigned using the 2D NOESY, HETCOR, and COLOC spectra. The influence of nonplanar nitro groups on chemical shifts of carbon atoms was studied. Some spectral peculiarities of the peri-methyl group were revealed. The 1H-1H and 13C-1H spin-spin coupling constants, including the extreme six-bond long-range coupling between the protons of the Me(5) group and H(8), were determined
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2002, 51 (10), 1817.pdf
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19.

Вид документа : Статья из журнала
Шифр издания : 54/P 51
Автор(ы) : Marakushev A. A., Paneyakh N. A., Rusinov V. L., Pertsev N. N., Zotov I. A.
Заглавие : Petrological model of formation of giant ore deposits
Место публикации : Geology of Ore Deposits. - 1998. - Vol. 40, № 3. - С. 211-227
Примечания : Bibliogr. : p. 227 (46 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The available data on the giant ore deposits of chromium (Kempirsai in the Urals), platinum-group metals (Bushveld in Africa), platinum-bearing copper-nickel ores (Talnakh in the Noril'sk district, northern part of the Siberian Platform), zinc-copper (massive sulfide) ores (Gai, Sibai, and Uchaly) and apatite deposits (Khibiny, the Kola Peninsula) is summarized. The giant sizes of the deposits are caused by extraordinary ore-forming processes directly associated with the highly extensive petrogenetic processes. These processes resulted in the formation of peculiar dunites in the hyperbasite complexes (chromite ores), agpaitic urtites in alkaline associations (apatite deposits), development of low-sulfide horizons and hortonolite dunites in the basite-hyperbasite layered intrusions (platinum-group metal deposits), specific processes of transmagmatic sulfurization of the iron-rich igneous differentiates (Cu-Ni sulfide and massif sulfide ores), and processes of magmatic replacement of hyperbasites that cause the alkaline agpaitic affinity of magmatism. This agpaitic tendency increases the solubility of carbon-bearing fluid components (CO2, CH4, etc.) in magma and leads to the concentration of ore metals, which form chloride-carbonate and hydrocarbon migrating compounds in the transmagmatic fluids. Some mineralogical-petrological prospecting criteria are deduced on the basis of genetic models of giant ore deposits.
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20.

Вид документа : Статья из журнала
Шифр издания : 54/W 20
Автор(ы) : Rusinova O. V., Rusinov V. L., Abramov S. S., Kuznetsova S. V., Vasyuta Yu. V.
Заглавие : Wall Rock Alterations and Physicochemical Conditions of the Sovetsk Gold Deposit Formation (Enisei Ridge)
Место публикации : Geology of Ore Deposits. - 1999. - Vol. 41, № 4. - С. 276-294
Примечания : Bibliogr. : p. 294 (24 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The mode of distribution of carbonaceous matter (CM) and specific characteristics of the metasomatic zonation were studied, as well as physicochemical conditions of the ore deposition and wall rock alteration at the Sovetsk gold deposit. The deposit relates to the quartz vein low-sulfide type and is hosted by carbonaceous rock sequences ("black shales") within a wide shear zone. This shear zone spreads along the regional Ishimbin strike-slip deep fault. The Proterozoic Tatarsk-Ayakhtin granitic complex, intruding the ore bearing rocks, composes the core of the ore district. Granites compose a pluton roof, where Olimpiada and Veduga gold deposits occur, and in contact zones the Eldorado and Pereval'ninsk deposits are located. The Sovetsk deposit is situated farther from the pluton contacts. The rocks of the ore-bearing sequence are metamorphosed in the chlorite-muscovite greenschists facies. A specific feature of wall rock alteration is unclear lateral metasomatic zonation with gradual transition between zones and alternating bands of strong and weak alterations. The main metasomatic minerals are muscovite and chlorite. Quartz and carbonate are subordinate, and ilmenite, rutile, monoclinic, and hexagonal pyrrhotites are accessories. Above ore bodies turmaline is rather common, but inside and below ore bodies albite occurs. The distribution and zonation of metasomatic parageneses allow us to call this kind of wall rock alteration as "disseminated metasomatism." The rock alteration developed sinchroneously with dynamic metamorphism in the strongly anisotropic sheared rocks. The absence or low intensity of acidic metasomatism is an important feature of the deposit. The temperature of metamorphism was 500-460°C, of wall rock alteration - 460-350°C, and of ore deposition (from early to late stages) from 380 to 150°C. The disseminated CM was metamorphosed to the low graphitic stage, and the condensed CM in veinlets corresponds to the late antracitic stage. The fugacity of oxygen and sulfur in the fluids was estimated with ilmenite = rutile + pyrrhotite equilibrium, composition of pyrrhotite and chlorite. The oxygen fugacity was lower than that of the ilmenite-magnetite buffer, and sulfur fugacity was lower than that of the pyrite-pyrhothite buffer. Nearer to the ore bodies the sulfur fugaeity increases, and inside ore bodies it corresponds to the pyrite + pyrrhotite paragenesis. The calculations of the oxygen fugacity with the gas composition in the system C-O-H suggests that the ratios CO2/CH4/H2O are close to the QFM and ilmenite-magnetite buffers and similar to that received with some mineral fugometers. Hydrocarbons with 2-4 carbon atoms appear not to be in equilibrium with CO2. The variation intervals of pH, fo2 and (before the ore deposition) of T are rather narrow. The pressure under metamorphism exceeded 1.9 kbar, but it decreased to the beginning of ore deposition to 0.7 kbar. This means that ores were deposited in an extension environment.
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