Intergranular diamonds derived from partial melting of crustal rocks at ultrahigh-pressure metamorphic conditions |
| |
| Authors: | Andrey V Korsakov Karel Theunissen Larissa V Smirnova |
| |
| Institution: | Department of Geology and Mineralogy, Royal Museum for Central Africa, B-3080 Tervuren, Belgium;;Institute of Mineralogy and Petrography;, and Institute of Geology, SB of the Russian Academy of Sciences, Novosibirsk, Russian Federation |
| |
| Abstract: | By reporting for the first time intergranular diamond in quartz–feldspar (Qtz–Kfs) aggregates, the processes of metamorphic diamond formation have to be reconsidered. Based on their Kfs/Qtz ratio, the texture of these aggregates are proposed to result from ‘granitic’ melt with a calculated composition that corresponds well with that of experimental data for the pelitic system. Taking into account experiments on CO2 solubility in silicate melt under ultrahigh‐pressure conditions, a granitic melt is further suggested to act as a crystallization medium as well as a transport medium for producing metamorphic diamond. |
| |
| Keywords: | |
|
|
