Computer Science
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1703h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 8, pp.1703-1713
Computer Science
Scientific paper
The isotopic composition of organic sulfur and disseminated and massive pyrite has been determined in vertical sections from eight low-sulfur coals (Paleocene and Cretaceous in age) in four coal fields of Wyoming and Colorado. The 34 S values of organic sulfur from five sites in the Anderson-Wyodak coal (Paleocene) of the eastern Powder River Basin, Wyoming, are more negative than expected for low-sulfur coals (-18.7 to +3.9%), suggesting that organic sulfur was derived from a combination of original plant sulfur and secondary, 34 S-depleted sulfur. The 34 S-depleted sulfur was probably produced from bacterial reduction of sulfate which infiltrated from the top and bottom during the peat stage. The 34 S of organic sulfur in a Paleocene coal from the Hanna Basin, Wyoming, ranges from +1.6 to +13.1 %. Vertical variation in 34 S here suggests bacterial reduction in a partially closed system of sulfate which infiltrated from the top of the seam. A Paleocene and a Cretaceous coal from the Green River Coal region, in Wyoming and Colorado, both yield 34 S values of organic sulfur (+2.4 to +8.1 %) consistent with what would be expected for original plant sulfur. 34 S values of pyrite at all sites varies widely (-52.6 to +34.6%). The isotope composition of the disseminated pyrite correlates with that of the organic sulfur, implying a similar mode and timing of incorporation. 34 S of the massive pyrite shows no such correlation.
Anderson Thomas F.
Hackley Keith C.
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