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On the fundamental difference between coal rank and coal type

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dc.contributor.author O'Keefe, Jennifer M. K. en
dc.contributor.author Bechtel, Achim en
dc.contributor.author Christanis, Kimon en
dc.contributor.author Dai, Shifeng en
dc.contributor.author DiMichele, William A. en
dc.contributor.author Eble, Cortland F. en
dc.contributor.author Esterle, Joan S. en
dc.contributor.author Mastalerz, Maria en
dc.contributor.author Raymond, Anne L. en
dc.contributor.author Valentim, Bruno V. en
dc.contributor.author Wagner, Nicola J. en
dc.contributor.author Ward, Colin R. en
dc.contributor.author Hower, James C. en
dc.date.accessioned 2014-02-24T20:30:16Z
dc.date.available 2014-02-24T20:30:16Z
dc.date.issued 2013
dc.identifier.citation 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, Bruno V., Wagner, Nicola J., Ward, Colin R., and Hower, James C. 2013. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F21839">On the fundamental difference between coal rank and coal type</a>." <em>International Journal of Coal Geology</em>. 118:58&ndash;87. <a href="https://doi.org/10.1016/j.coal.2013.08.007">https://doi.org/10.1016/j.coal.2013.08.007</a> en
dc.identifier.issn 0166-5162
dc.identifier.uri http://hdl.handle.net/10088/21839
dc.description.abstract Abstract This article addresses the fundamental difference between coal rank and coal type. While theoretically settled along 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. en
dc.relation.ispartof International Journal of Coal Geology en
dc.title On the fundamental difference between coal rank and coal type en
dc.type Journal Article en
dc.identifier.srbnumber 116829
dc.identifier.doi 10.1016/j.coal.2013.08.007
rft.jtitle International Journal of Coal Geology
rft.volume 118
rft.spage 58
rft.epage 87
dc.description.SIUnit NH-Paleobiology en
dc.description.SIUnit NMNH en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 58
dc.citation.epage 87

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