Low-ash peat deposits from a dendritic, intermontane basin in the tropics: a new model for good quality coals

Many good quality, thick, low-ash Carboniferous, Cretaceous and Tertiary coal deposits have dulling-upward sequences that have been interpreted to be of ombrotrophic, lowland, coastal origin. Previous studies of potential modern analogues for thick, dulling-upward coal sequences have focused on trop...

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Bibliographic Details
Published in:International journal of coal geology 2001-05, Vol.46 (2), p.179-206
Main Authors: Wüst, Raphael A.J, Bustin, R.Marc
Format: Article
Language:English
Subjects:
Coal
Dulling-upward coal analogue
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
Isotope geochemistry. Geochronology
Low-ash peat
Malaysia
Marine and continental quaternary
Rheotrophic peat
Sedimentary rocks
Surficial geology
Tasek Bera
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Summary:Many good quality, thick, low-ash Carboniferous, Cretaceous and Tertiary coal deposits have dulling-upward sequences that have been interpreted to be of ombrotrophic, lowland, coastal origin. Previous studies of potential modern analogues for thick, dulling-upward coal sequences have focused on tropical, ombrotrophic coastal peats. However, most modern coastal ombrotrophic deposits would yield “all bright” coal seams. New evidence from peat deposits of the southern intermontane Tasek Bera Basin, Western Malaysia, reveals that thick, low-ash, low-sulfur peat may originate in narrow tributary valleys with moderately steep flank gradients. These deposits may be favorable precursors to dulling-upward coals, in that they contain high wood and low-ash content at depth and medium wood and slightly increasing ash content in the upper parts. Peat accumulation in the Tasek Bera Basin began in Mid-Holocene time. During the past 4500 years, 500 cm of low-ash (
ISSN:0166-5162
1872-7840
DOI:10.1016/S0166-5162(01)00021-0