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Intergranular diamonds derived from partial melting of crustal rocks at ultrahigh‐pressure metamorphic conditions
Author(s) -
Korsakov Andrey V.,
Theunissen Karel,
Smirnova Larissa V.
Publication year - 2004
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/j.1365-3121.2004.00547.x
Subject(s) - metamorphic rock , geology , quartz , crystallization , geochemistry , diamond , texture (cosmology) , silicate , partial melting , pelite , mineralogy , materials science , metallurgy , thermodynamics , crust , chemical engineering , paleontology , physics , artificial intelligence , computer science , engineering , image (mathematics)
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 CO 2 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.