TY - JOUR
T1 - Experimental determination of carbon isotope fractionation between graphite and carbonated silicate melt under upper mantle conditions
AU - Mizutani, Shogo
AU - Satish-Kumar, M.
AU - Yoshino, Takashi
N1 - Funding Information:
We thank H. Wada and E. Ito for stimulating discussions. We thank Y. Hiroi and M. Kato for their kind assistance for EPMA analysis at Chiba University, Constructive comments from Max Schmidt and an anonymous reviewer helped to improve the contents considerably. We thank Bernard Marty for his effective editorial handling. This paper presents the results of a joint research program carried out at the Institute for Study of the Earth's Interior, Okayama University. M.S.-K. and T.Y. acknowledges the financial support from the Ministry of Education, Culture, Sports, Science and Technology, Japan (Nos. 23654186 and 24244087 , respectively).
PY - 2014/4/15
Y1 - 2014/4/15
N2 - Carbon isotope fractionation between graphite and carbonated silicate melt was determined at 5 GPa and in the temperature range between 1400 and 1900°C. High pressure experiments were carried out in the carbon-saturated model harzbergite system (Enstatite-Magnesite-Olivine-Graphite), where carbonated silicate melt and graphite were the two stable carbon-bearing phases in the run products. Carbonated silicate melting resulted in an isotopic fractionation between graphite and carbon in the silicate melt, where the carbon in the melt is 13C enriched than co-existing graphite. 13C enrichment in carbonate melt when compared to graphite was further confirmed in experiments where redox melting between olivine and graphite produced carbonate melt as well as carbonate reduction experiments to form graphite. Although a quantitative estimate of fractionation between carbonate melt and graphite could not be obtained, our results indicate that mantle melting in the presence of graphite can result in progressive 13C carbon isotope enrichment in carbonate melt and depletion in graphite, which can be an alternate explanation for the carbon isotopic heterogeneity observed in the mantle derived carbon.
AB - Carbon isotope fractionation between graphite and carbonated silicate melt was determined at 5 GPa and in the temperature range between 1400 and 1900°C. High pressure experiments were carried out in the carbon-saturated model harzbergite system (Enstatite-Magnesite-Olivine-Graphite), where carbonated silicate melt and graphite were the two stable carbon-bearing phases in the run products. Carbonated silicate melting resulted in an isotopic fractionation between graphite and carbon in the silicate melt, where the carbon in the melt is 13C enriched than co-existing graphite. 13C enrichment in carbonate melt when compared to graphite was further confirmed in experiments where redox melting between olivine and graphite produced carbonate melt as well as carbonate reduction experiments to form graphite. Although a quantitative estimate of fractionation between carbonate melt and graphite could not be obtained, our results indicate that mantle melting in the presence of graphite can result in progressive 13C carbon isotope enrichment in carbonate melt and depletion in graphite, which can be an alternate explanation for the carbon isotopic heterogeneity observed in the mantle derived carbon.
KW - Carbon isotope fractionation
KW - Carbonated mantle melting
KW - Deep carbon cycle
KW - Graphite
KW - Magnesite
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U2 - 10.1016/j.epsl.2014.02.006
DO - 10.1016/j.epsl.2014.02.006
M3 - Article
AN - SCOPUS:84894445970
SN - 0012-821X
VL - 392
SP - 86
EP - 93
JO - Earth and Planetary Sciences Letters
JF - Earth and Planetary Sciences Letters
ER -