NDLI: On Speciation and Metal-silicate Partitioning of Carbon in a Magma Ocean – Implications for Core-mantle Volatile Fractionation in Terrestrial Planets

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On Speciation and Metal-silicate Partitioning of Carbon in a Magma Ocean – Implications for Core-mantle Volatile Fractionation in Terrestrial Planets

Content Provider	Semantic Scholar
Author	Dasgupta, Ritabrata Chi, Hsin-Chang Duncan, Melissa K. Shimizu, Nobumichi
Copyright Year	2013
Abstract	Introduction: Constraining the behavior of volatile elements during accretion, in general and in a magma ocean in particular, is critical in understanding the initial stage for further evolution of volatile cycles in terrestrial planets. The fate of carbon during coremantle fractionation in a magma ocean in particular might be key because of carbon’s role in building a habitable planet. A difference in carbon partitioning behavior in magma ocean stage of various terrestrial planets might have forced Earth to evolve differently than other terrestrial planets such as Mars [1]. Partition coefficient of carbon between Fe-rich, metallic alloy melt and silicate melt, metal/silicate C D is a key quantity that must have had influence on the carbon budget of the silicate fraction of the terrestrial planets versus the metallic core [2-4]. However, no quantitative framework yet exists that allow prediction of metal/silicate C D as a function of key variables of relevant for core-mantle equilibration at a magma ocean condition. Recent studies with vastly different approaches and assumptions produced disparate estimates of metal/silicate C D relevant for terrestrial magma ocean with value as low as ~9 [5] and as high as 10-10 [6] and experimental constraints on metal/silicate C D remain limited [3]. To build on the recent experiments [3], here we present results from 25 new high pressure experiments on the solubility of carbon in coexisting Fe-Ni metallic alloy melt and basaltic silicate melt in order to quantify the effect of pressure (P), temperature (T), oxygen fugacity (fO2), silicate melt composition, and silicate melt hydration on
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.lpi.usra.edu/meetings/lpsc2013/pdf/2255.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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