TY - JOUR
T1 - Interstratification of carbonaceous material within illite
AU - Ahn, Jung Ho
AU - Cho, Moonsup
AU - Buseck, P R
PY - 1999
Y1 - 1999
N2 - We here report the first recognized natural occurrence of a clay mineral with interstratified carbonaceous material that, in places, approaches graphite in its structural ordering. Using high-resolution transmission electron microscopy (HRTEM), we found that carbonaceous material in an early stage of graphitization occurs in extremely thin (<100 Å) domains both between and interstratified within illite crystals. This material could have been trapped during the growth of the illite or have been inherited from precursor clay minerals in the host sediment during diagenesis and metamorphism. Graphitization in low-grade rocks involves complicated microstructural changes in the carbonaceous material as a result of its fine-scale intergrowth with clay minerals. In addition, this study demonstrates that by utilizing ion-milled specimens, in situ structures and textures of fine-grained carbonaceous samples can be investigated without the unavoidable disruption produced by crushing or grinding.
AB - We here report the first recognized natural occurrence of a clay mineral with interstratified carbonaceous material that, in places, approaches graphite in its structural ordering. Using high-resolution transmission electron microscopy (HRTEM), we found that carbonaceous material in an early stage of graphitization occurs in extremely thin (<100 Å) domains both between and interstratified within illite crystals. This material could have been trapped during the growth of the illite or have been inherited from precursor clay minerals in the host sediment during diagenesis and metamorphism. Graphitization in low-grade rocks involves complicated microstructural changes in the carbonaceous material as a result of its fine-scale intergrowth with clay minerals. In addition, this study demonstrates that by utilizing ion-milled specimens, in situ structures and textures of fine-grained carbonaceous samples can be investigated without the unavoidable disruption produced by crushing or grinding.
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U2 - 10.2138/am-1999-11-1226
DO - 10.2138/am-1999-11-1226
M3 - Article
AN - SCOPUS:0033390762
SN - 0003-004X
VL - 84
SP - 1967
EP - 1970
JO - American Mineralogist
JF - American Mineralogist
IS - 11-12
ER -