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- W2010482912 abstract "A large (> 82 km2), thick (> 8 m), low-ash, low-sulfur peat deposit has formed on the northwestern coast of Panama. Its low ash and low sulfur contents can be attributed partly to: (1) doming; (2) the occurrence of a relatively continuous, marine-blocking, beach-barrier shoreline feature; and (3) leaching of the mineral matter. This deposit is roughly rectangular in shape and oriented with its longest axis parallel to the beach-barrier shoreline. It would produce an economic coal bed that is bright and finely banded in its thickest central region and more coarsely banded at its margins. Its northwestern margin would be characterized by interfingering of coal with sandstone and siltstone of the Changuinola River flood plain, whereas its southeastern boundary would be characterized by truncation of the upper part of the seam by marine to brackish shales, siltstones, and carbonates that were derived from Almirante Bay. Total sulfur was found to be very low (less than 0.2% dry wt.) except in a few places. In these rare cases, nearly all of the sulfur was pyritic and the total sulfur content was anomalously high (> 14%). Although the general tendency was for total sulfur to increase wherever the deposit was influenced by marine conditions, one case was found where sulfur was high at the base of an inland freshwater peat core, which suggests either a “hidden” marine influence or the need for some new mechanism to explain sulfur enrichment in such an anomalous case. Differences in inherent fixed carbon contents and calorific values due to changes in peat type and analytical uncertainties tended to mask seamwide trends in these parameters. However, fixed carbon contents and calorific values showed a slight tendency to increase with depth (especially if plotted for single peat types). Vitrinite reflectance within the hypothetical Changuinola coal bed would be expected to increase as follows: (1) toward the margins of the deposit; (2) toward the bottom and top of the bed; and (3) toward stream channels or tidal inlets." @default.
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- W2010482912 date "1989-06-01" @default.
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- W2010482912 title "The Changuinola peat deposit of northwestern Panama: a tropical, back-barrier, peat(coal)-forming environment" @default.
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- W2010482912 doi "https://doi.org/10.1016/0166-5162(89)90050-5" @default.
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