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Processes and conditions of the origin for Fe3+-bearing magnesiowüstite under lithospheric mantle pressures and temperatures. / Bataleva, Yuliya; Palyanov, Yuri; Borzdov, Yuri et al.
In: Minerals, Vol. 9, No. 8, 474, 01.08.2019.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Processes and conditions of the origin for Fe3+-bearing magnesiowüstite under lithospheric mantle pressures and temperatures
AU - Bataleva, Yuliya
AU - Palyanov, Yuri
AU - Borzdov, Yuri
AU - Bayukov, Oleg
N1 - Publisher Copyright: © 2019 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - An experimental study, implicated in the revealing of the conditions for the origin for Fe3+-bearing magnesiowüstite in the lithospheric mantle, was performed using Mössbauer spectroscopy of pre-synthesized samples. Experiments were carried out using a multi-anvil high-pressure split-sphere apparatus at 6.3–7.5 GPa, in the range of 1100–1650 °C in carbonate-metal, carbonate–oxide-metal, carbonate-oxide, carbide-oxide and carbonate–metal-sulphur systems. In three experimental series, oxygen fugacity gradient in the samples was created, which enabled the study of the processes of magnesiowüstite formation under oxidizing and reducing conditions (ΔlogfO2 (FMQ) values from −1 to −5). It was established that Fe3+-bearing magnesiowüstite can form both in assemblage with oxidized phases, such as carbonate or with reduced ones—metal, carbides, sulphides, graphite and diamond. According to the Mössbauer spectroscopy, the composition of synthesized magnesiowüstite varied within a range of Fe3+/ΣFe values from 0 to 0.3, with IV and VI coordination of Fe3+ depending on P, T, fO2, x-parameters. It was established that Fe3+-bearing magnesiowüstite formation processes under upper mantle P,T-conditions include redox reactions, with magnesiowüstite being (1) reductant or (2) product of interaction, (3) crystallization processes of magnesiowüstite from an oxidized melt, where magnesiowüstite acts as a sink for ferric iron and (4) iron disproportionation.
AB - An experimental study, implicated in the revealing of the conditions for the origin for Fe3+-bearing magnesiowüstite in the lithospheric mantle, was performed using Mössbauer spectroscopy of pre-synthesized samples. Experiments were carried out using a multi-anvil high-pressure split-sphere apparatus at 6.3–7.5 GPa, in the range of 1100–1650 °C in carbonate-metal, carbonate–oxide-metal, carbonate-oxide, carbide-oxide and carbonate–metal-sulphur systems. In three experimental series, oxygen fugacity gradient in the samples was created, which enabled the study of the processes of magnesiowüstite formation under oxidizing and reducing conditions (ΔlogfO2 (FMQ) values from −1 to −5). It was established that Fe3+-bearing magnesiowüstite can form both in assemblage with oxidized phases, such as carbonate or with reduced ones—metal, carbides, sulphides, graphite and diamond. According to the Mössbauer spectroscopy, the composition of synthesized magnesiowüstite varied within a range of Fe3+/ΣFe values from 0 to 0.3, with IV and VI coordination of Fe3+ depending on P, T, fO2, x-parameters. It was established that Fe3+-bearing magnesiowüstite formation processes under upper mantle P,T-conditions include redox reactions, with magnesiowüstite being (1) reductant or (2) product of interaction, (3) crystallization processes of magnesiowüstite from an oxidized melt, where magnesiowüstite acts as a sink for ferric iron and (4) iron disproportionation.
KW - Diamond
KW - Experimental modeling
KW - Fe-bearing magnesiowüstite
KW - Graphite
KW - High-pressure experiment
KW - Lithospheric mantle
KW - Mantle oxides
KW - Redox reactions
KW - MAGNESIUM-OXIDE
KW - lithospheric mantle
KW - high-pressure experiment
KW - STABILITY
KW - mantle oxides
KW - DEEP MANTLE
KW - graphite
KW - DIAMOND FORMATION
KW - redox reactions
KW - PHASE-TRANSFORMATIONS
KW - experimental modeling
KW - CARBON
KW - Fe3+-bearing magnesiowustite
KW - FERROPERICLASE
KW - MINERAL INCLUSIONS
KW - diamond
KW - EQUATION-OF-STATE
KW - FERRIC IRON CONTENT
UR - http://www.scopus.com/inward/record.url?scp=85070739784&partnerID=8YFLogxK
U2 - 10.3390/min9080474
DO - 10.3390/min9080474
M3 - Article
AN - SCOPUS:85070739784
VL - 9
JO - Minerals
JF - Minerals
SN - 2075-163X
IS - 8
M1 - 474
ER -
ID: 21257100