On the fundamental difference between coal rank and coal type

O'Keefe, Jennifer M. K., Bechtel, Achim, Christanis, Kimon, Dai, Shifeng, DiMichele, William A., Eble, Cortland F., Esterle, Joan S., Mastalerz, Maria, Raymond, Anne L., Valentim, Buno V., Wagner, Nicola J., Ward, Colin R. and Hower, James C. (2013) On the fundamental difference between coal rank and coal type. International Journal of Coal Geology, 118 58-87. doi:10.1016/j.coal.2013.08.007


Author O'Keefe, Jennifer M. K.
Bechtel, Achim
Christanis, Kimon
Dai, Shifeng
DiMichele, William A.
Eble, Cortland F.
Esterle, Joan S.
Mastalerz, Maria
Raymond, Anne L.
Valentim, Buno V.
Wagner, Nicola J.
Ward, Colin R.
Hower, James C.
Title On the fundamental difference between coal rank and coal type
Journal name International Journal of Coal Geology   Check publisher's open access policy
ISSN 0166-5162
1872-7840
Publication date 2013-10-01
Year available 2013
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1016/j.coal.2013.08.007
Volume 118
Start page 58
End page 87
Total pages 30
Place of publication Amsterdam, The Netherlands
Publisher Elsevier BV
Collection year 2014
Language eng
Subject 1905 Visual Arts and Crafts
1907 Geology
1913 Stratigraphy
2103 Historical Studies
Abstract This article addresses the fundamental difference between coal rank and coal type. While theoretically settled long ago as being different aspects of coal systems science, the two concepts are still often confounded. In recent years, this has resulted in the publication of several works stating that coal type changes with coal rank. Coal type refers solely to coals' depositional origin and the maceral-mineral admixture resulting from that origin. Coal types typically fall in to two categories: humic coals, developed from peat, and sapropelic coals, developed from organic mud. Either type may be allocthonous or autochthonous, and within types, further refinement of depositional environment can be made. Coal rank refers to the changes in geochemistry and resultant changes in reflectance caused by increasing thermal maturity of the coal. Thus, it provides an overprint of maturity on existing coal types. With proper techniques, such as use of crossed polars and etching, maceral forms can be differentiated even at high ranks, and the original coal type determined.
Keyword Coalification
Depositional environment
Geochemistry
Maceral
Rank
Q-Index Code CX
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
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