| Инд. авторы: | Bataleva Y.V., Palyanov Y.N., Borzdov Y.M., Novoselov I.D., Bayukov O.A., Sobolev N.V. |
| Заглавие: | Conditions of Formation of Iron-Carbon Melt Inclusions in Garnet and Orthopyroxene under P-T Conditions of Lithospheric Mantle |
| Библ. ссылка: | Bataleva Y.V., Palyanov Y.N., Borzdov Y.M., Novoselov I.D., Bayukov O.A., Sobolev N.V. Conditions of Formation of Iron-Carbon Melt Inclusions in Garnet and Orthopyroxene under P-T Conditions of Lithospheric Mantle // Petrology. - 2018. - Vol.26. - Iss. 6. - P.565-574. - ISSN 0869-5911. - EISSN 1556-2085. |
| Идентиф-ры: | DOI: 10.1134/S0869591118060024; SCOPUS: 2-s2.0-85056115441; WoS: 000449465700001; |
| Реферат: | eng: Of great importance in the problem of redox evolution of mantle rocks is the reconstruction of scenarios of alteration of Fe-0- or Fe3C-bearing rocks by oxidizing mantle metasomatic agents and the evaluation of stability of these phases under the influence of fluids and melts of different compositions. Original results of high-temperature high-pressure experiments (P = 6.3 GPa, T = 1300-1500 degrees C) in the carbide-oxide-carbonate systems (Fe3C-SiO2-(Mg,Ca)CO3 and Fe3C-SiO2-Al2O3-(Mg,Ca)CO3) are reported. Conditions of formation of mantle silicates with metallic or metal-carbon melt inclusions are determined and their stability in the presence of CO2-fluid representing the potential mantle oxidizing metasomatic agent are estimated. It is established that garnet or orthopyroxene and CO2-fluid are formed in the carbide-oxide-carbonate system through decarbonation, with subsequent redox interaction between CO2 and iron carbide. This results in the formation of assemblage of Fe-rich silicates and graphite. Garnet and orthopyroxene contain inclusions of a Fe-C melt, as well as graphite, fayalite, and ferrosilite. It is experimentally demonstrated that the presence of CO2-fluid in interstices does not affect on the preservation of metallic inclusions, as well as graphite inclusions in silicates. Selective capture of Fe-C melt inclusions by mantle silicates is one of the potential scenarios for the conservation of metallic iron in mantle domains altered by mantle oxidizing metasomatic agents.
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| Ключевые слова: | graphite; diamond; mantle silicates; mantle metasomatism; EARTHS LOWER MANTLE; DIAMOND FORMATION; DEEP MANTLE; PHYSICOCHEMICAL PARAMETERS; MINERAL INCLUSIONS; METALLIC IRON; SUBDUCTION; STABILITY; PRESSURE; OXIDATION; high-pressure experiment; CO2-fluid; metal-carbon melt; |
| Издано: | 2018 |
| Физ. хар-ка: | с.565-574 |