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Conditions for diamond and graphite formation from iron carbide at the P-T parameters of lithospheric mantle / Y. V. Bataleva [et al.] // Russ. Geol. Geophys. - 2016. - Vol. 57, Is. 1 : Tectonics, geodynamics, and petrology of earth’s lithosphere and mantle (to the 80th birthday of Academician Nikolai Leontievich Dobretsov). - P. 176-189, DOI 10.1016/j.rgg.2016.01.012. - Cited References:55. - This work was supported by the Russian Science Foundation under Grant No. 14-27-00054. . - ISSN 1068-7971. - ISSN 1878-030X

РУБ Geosciences, Multidisciplinary
Рубрики:
DEEP CARBON-CYCLE
   EARTHS MANTLE
   MINERAL INCLUSIONS
   HIGH-PRESSURE
   KOKCHETAV MASSI
   SUBDUCTION ZONES
   REDOX BUDGET
   FERRIC IRON
   MOSSBAUER
   METAL
Кл.слова (ненормированные):
iron carbide -- wusite -- graphite -- diamond -- oxides -- olivine -- subduction -- redox interaction -- lithospheric mantle -- high-pressure experiment
Аннотация: To estimate conditions for the stability of iron carbide under oxidation conditions and to assess the possibility of formation of elemental carbon by interaction between iron carbide and oxides, experimental modeling of redox interaction in the systems Fe3C-Fe2O3 and Fe3C-Fe2O3-MgO-SiO2 was carried out on a split-sphere high-pressure multianvil apparatus at 6.3 GPa and 900-1600 degrees C for 18-20 h. During carbide-oxide interaction in the system Fe3C-Fe2O3, graphite crystallizes in assemblage with Fe3+-containing wusite. Graphite forms from carbide carbon mainly by cohenite oxidation: Fe3C + 3Fe(2)O(3) -> 9FeO + C-0 and FeO + Fe3C -> (Fe2+, Fe3+)O + C-0. At above-solidus temperatures (>= 1400 degrees C), when metal-carbon melt is oxidized by wusite, graphite and diamond crystallize by the redox mechanism and form the Fe3+-containing wstite + graphite/diamond assemblage. Interaction in the system Fe3C-Fe2O3-MgO-SiO2 results in the formation of Fe3+-containing mannesiowusite-olivine-graphite assemblage. At >= 1500 degrees C, two melts with contrasting f(O2) values are generated: metal-carbon and silicate-oxide; their redox interaction leads to graphite crystallization and diamond growth. Under oxidation conditions, iron carbide is unstable in the presence of iron, silicon, and magnesium oxides, even at low temperatures. Iron carbide-oxide interaction at the mantle temperatures and pressures leads to the formation of elemental carbon; graphite is produced from carbide carbon mainly by redox reactions of cohenite (or metal-carbon melt) with Fe2O3 and FeO as well as by interaction between metal-carbon and silicate-oxide melts. The results obtained suggest that cohenite can be a potential source of carbon during graphite (diamond) formation in the lithospheric mantle and the interaction of iron carbide with iron, silicon, and magnesium oxides, during which carbon is extracted can be regarded as a process of the global carbon cycle. (C) 2016, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

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Публикация на русском языке Условия образования графита и алмаза из карбида железа при Р, Т-параметрах литосферной мантии [Текст] / Ю. В. Баталева [и др.] // Геол. и геофиз. - 2016. - Т. 57 № 1. - С. 225-240

Держатели документа:
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Pr Akad Koptyuga 3, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Ul Pirogova 2, Novosibirsk 630090, Russia.
Russian Acad Sci, Siberian Branch, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Bataleva, Yu. V.; Palyanov, Yu. N.; Borzdov, Yu. M.; Bayukov, O. A.; Баюков, Олег Артемьевич; Sobolev, N. V.; Russian Science Foundation [14-27-00054]
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In situ spectroscopic study of water intercalation into talc: New features of 10 Å phase formation / S. V. Rashchenko [et al.] // Am. Miner. - 2016. - Vol. 100, Is. 1-2. - P. 431-436, DOI 10.2138/am-2016-5356. - Cited References:32. - This research was supported by Russian Foundation for Basic Research [grants 13-05-00185 and 14-05-00616]. A partial support from Russian Ministry of Education and Science [grant 14.B25.31.0032] and Russian Science Foundation [grant 14-13-00834] is acknowledged. We also acknowledge Mark D. Welch and an anonymous reviewer for a helpful revision of the manuscript. . - ISSN 0003-004X. - ISSN 1945-3027

РУБ Geochemistry & Geophysics + Mineralogy
Рубрики:
SYSTEM MgO-SiO2-H2O
   SUBDUCTION ZONES
   10-ANGSTROM PHASE
   HIGH-PRESSURES
   H2O CONTENT
   HP-HT
   MANTLE
   STABILITY
   TEMPERATURES
   GPA
Кл.слова (ненормированные):
10 angstrom phase -- talc -- water transport -- subduction
Аннотация: The synthesis of 10 angstrom phase via the reaction of talc plus water at 8 GPa and 500 degrees C was studied by in situ Raman spectroscopy using a diamond-anvil cell. The initial fast (2 h) incorporation of interlayer H2O molecules into the talc structure is traced by gradual growth of new OH stretching bands at 3592 and 3621 cm(-1) and the shift of several framework bands. Further monitoring at HP-HT conditions over 7 h reveals gradual weakening of the 3592 cm(-1) band, which can probably be related to the onset of the formation of "long-run" 10 angstrom phase through the appearance of silanol groups following the model proposed by Pawley et al. (2010), influencing the interlayer hydrogen bonding.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Sobolev Inst Geol & Mineral, 3 Koptyug Ave, Novosibirsk 630090, Russia.
Novosibirsk State Univ, 2 Pirogov St, Novosibirsk 630090, Russia.
Russian Acad Sci, Siberian Branch, Inst Solid State Chem & Mechanochem, 18 Kutateladze St, Novosibirsk 630128, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Rashchenko, Sergey V.; Likhacheva, A. Y.; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Litasov, Konstantin D.; Russian Foundation for Basic Research [13-05-00185, 14-05-00616]; Russian Ministry of Education and Science [14.B25.31.0032]; Russian Science Foundation [14-13-00834]
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Raman study of phengite at P-T conditions modeling cold slab subduction / A. S. Oreshonkov [et al.] // XII Int. conf. "GeoRaman-2016" : abstract volume / compiled and edited by T.A. Alifirova, S.V. Rashchenko, A.V. Korsakov. - Novosibirsk : Офсет, 2016. - P. 97. - References: 1. - This work was supported by the Russian Foundation for Basic Research (projects No. 14-05-00616 and 15-55-45070-IND) and the Russian Science Foundation (project No.15-17-30012). . - ISBN 978-5-85957-124-6
Аннотация: Phengite K(Al,Mg)2(OH)2 (Si,Al)4O10 is potassium dioctahedral mica. Its structure is similar to that of muscovite, but with high content of Mg. Phengite as water transporter is among the most deep hydrated minerals in subducting slabs [1].We present Raman study of phengite compressed in water medium at simultaneously high P-T conditions up to 500 °C and 12.2 GPa, in order to model its behavior at conditions of cold slab subduction and to detect possible non-quenchable states (polymorphism, amorphization and dehydration). Raman spectra of phengite exhibit high stability up to maximal P-T parameters used (Fig. 1). Its Raman bands slightly decrease in intensity and widen in the range of 300-500 °C. Monotonous P-dependences of the wavenumbers of strong bands at 263, 703 and 3612 cm–1 (the last is O-H stretching mode) prove that no transitions are available at high P-T. According to the data [1], phengite can transform to K-hollandite at P10 GPa, T 500 °C, however, we did not observe this transformation that could be caused by small time (~4 h) in our experiment or different composition of phengite samples. Thus, our insitu experiments prove highly baric and temperature stability and absence non-quenchable transitions of phengite.

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Доп.точки доступа:
Alifirova, T. A. \ed.\; Rashchenko, S. V. \ed.\; Korsakov, A. V. \ed.\; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Krylov, A. S.; Крылов, Александр Сергеевич; Polyansky, O. P.; Полянский, О. П.; Vtyurin, A. N.; Втюрин, Александр Николаевич; "GeoRaman", International conference(12 ; 2016 ; June ; 9-15 ; Novosibirsk); Российская академия наук; Сибирское отделение РАН; Институт геологии и минералогии им. В.С. Соболева Сибирского отделения РАН
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In situ Raman spectroscopic study of interaction between phengite and water under P–T conditions typical of subduction zones / S. V. Goryainov [et al.] // Bull. Russ. Acad. Sci. Phys. - 2017. - Vol. 81, Is. 5. - P. 590-593, DOI 10.3103/S1062873817050100. - Cited References: 14 . - ISSN 1062-8738
Кл.слова (ненормированные):
High pressure engineering -- Spectroscopic analysis -- Cold subduction -- Diamond-anvil cell -- High temperature and pressure -- High-pressure and temperatures -- In-situ Raman spectroscopy -- Polymorphic transitions -- Resistively heated -- Subduction zones -- Raman spectroscopy
Аннотация: In situ Raman spectroscopy is used to study the layered mineral phengite K(Al, Mg)2(Si, Al)4O10(OH)2 in water under the high temperature and pressure conditions typical of cold subduction zones (T up to 373°C and P = 12.5 GPa). High pressure and temperature were created in a resistively heated diamond anvil cell. Raman spectra show the high P–T stability of phengite. No reversible polymorphic transitions (overhydration or notable amorphization) are observed. © 2017, Allerton Press, Inc.

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Публикация на русском языке In situ КР-исследование взаимодействия фенгита с водной средой при субдукционных P-J-параметрах [Текст] / С. В. Горяйнов [и др.] // Изв. РАН. Сер. физич. - 2017. - Т. 81 № 5. - С. 637-640

Держатели документа:
Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Novosibirsk, Russian Federation
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Akademgorodok, Krasnoyarsk, Russian Federation
Ural State University of Economics, Yekaterinburg, Russian Federation

Доп.точки доступа:
Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Polyansky, O. P.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Zmeeva, N. Y.
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