Research output: Contribution to journal › Article › peer-review
Carbon and Nitrogen Speciation in N-poor C-O-H-N Fluids at 6.3 GPa and 1100-1400 °c. / Sokol, Alexander G.; Tomilenko, Anatoly A.; Bul'Bak, Taras A. et al.
In: Scientific Reports, Vol. 7, No. 1, 706, 06.04.2017.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Carbon and Nitrogen Speciation in N-poor C-O-H-N Fluids at 6.3 GPa and 1100-1400 °c
AU - Sokol, Alexander G.
AU - Tomilenko, Anatoly A.
AU - Bul'Bak, Taras A.
AU - Palyanova, Galina A.
AU - Sokol, Ivan A.
AU - Palyanov, Yury N.
PY - 2017/4/6
Y1 - 2017/4/6
N2 - Deep carbon and nitrogen cycles played a critical role in the evolution of the Earth. Here we report on successful studying of speciation in C-O-H-N systems with low nitrogen contents at 6.3 GPa and 1100 to 1400 °C. At fO2 near Fe-FeO (IW) equilibrium, the synthesised fluids contain more than thirty species. Among them, CH4, C2H6, C3H8 and C4H10 are main carbon species. All carbon species, except for C1-C4 alkanes and alcohols, occur in negligible amounts in the fluids generated in systems with low H2O, but C15-C18 alkanes are slightly higher and oxygenated hydrocarbons are more diverse at higher temperatures and H2O concentrations. At a higher oxygen fugacity of +2.5 Δlog fO2 (IW), the fluids almost lack methane and contain about 1 rel.% C2-C4 alkanes, as well as fractions of percent of C15-18 alkanes and notable contents of alcohols and carboxylic acids. Methanimine (CH3N) is inferred to be the main nitrogen species in N-poor reduced fluids. Therefore, the behaviour of CH3N may control the nitrogen cycle in N-poor peridotitic mantle. Oxidation of fluids strongly reduces the concentration of CH4 and bulk carbon. However, higher alkanes, alcohols, and carboxylic acids can resist oxidation and should remain stable in mantle hydrous magmas.
AB - Deep carbon and nitrogen cycles played a critical role in the evolution of the Earth. Here we report on successful studying of speciation in C-O-H-N systems with low nitrogen contents at 6.3 GPa and 1100 to 1400 °C. At fO2 near Fe-FeO (IW) equilibrium, the synthesised fluids contain more than thirty species. Among them, CH4, C2H6, C3H8 and C4H10 are main carbon species. All carbon species, except for C1-C4 alkanes and alcohols, occur in negligible amounts in the fluids generated in systems with low H2O, but C15-C18 alkanes are slightly higher and oxygenated hydrocarbons are more diverse at higher temperatures and H2O concentrations. At a higher oxygen fugacity of +2.5 Δlog fO2 (IW), the fluids almost lack methane and contain about 1 rel.% C2-C4 alkanes, as well as fractions of percent of C15-18 alkanes and notable contents of alcohols and carboxylic acids. Methanimine (CH3N) is inferred to be the main nitrogen species in N-poor reduced fluids. Therefore, the behaviour of CH3N may control the nitrogen cycle in N-poor peridotitic mantle. Oxidation of fluids strongly reduces the concentration of CH4 and bulk carbon. However, higher alkanes, alcohols, and carboxylic acids can resist oxidation and should remain stable in mantle hydrous magmas.
KW - CRYSTALLIZATION
KW - DIAMOND FORMATION
KW - EARTHS MANTLE
KW - HIGH-PRESSURE
KW - HYDROCARBONS
KW - KIMBERLITE
KW - OXYGEN FUGACITY
KW - PERIDOTITE XENOLITHS
KW - PROFILE
KW - REDOX STATE
UR - http://www.scopus.com/inward/record.url?scp=85018768780&partnerID=8YFLogxK
U2 - 10.1038/s41598-017-00679-7
DO - 10.1038/s41598-017-00679-7
M3 - Article
C2 - 28386094
AN - SCOPUS:85018768780
VL - 7
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 706
ER -
ID: 9443597