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Asymmetric X‐ray diffraction peak of metamorphosed carbonaceous material
Author(s) -
Itaya Tetsumaru,
Tomuro Morio,
Ninagawa Kiyotaka
Publication year - 1997
Publication title -
island arc
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.554
H-Index - 58
eISSN - 1440-1738
pISSN - 1038-4871
DOI - 10.1111/j.1440-1738.1997.tb00172.x
Subject(s) - crystallite , graphite , diffraction , materials science , chlorite , metamorphic rock , crystallography , x ray crystallography , mineralogy , composite material , geology , chemistry , metallurgy , geochemistry , optics , physics , quartz
It was revealed that the asymmetric X‐ray diffraction peak of metamorphosed carbonaceous material was a combination of two types of symmetric peaks from the coaly material and graphite crystallite. Numerical synthesis using the two symmetric peaks shows the graphitization process observed in a metamorphic sequence is accompanied by a continuous change of the peak shape and apparent interplanar spacing. Based on the analytical results and geological observations, it is suggested that graphitization of carbonaceous material consists of two processes: (i) the formation of graphite crystallites at the expense of the coaly material through the formation of transitional material and the increasing abundance of crystallites which is observed in the chlorite zone; and (ii) growth of crystallites forming well‐ordered graphite, which occurs in the higher‐grade zone.