| Abstract: | The 11-13 m thick Foord Seam in the fault-bounded Stellarton Basin, Nova Scotia, is the thickest seam from the Euramerican floral province known to contain coal-balls. In addition to the first discovery of autochthonous coal-balls in the Foord Seam, Nova Scotia, its shale parting also contains hypautochthonous coal-balls with histologically preserved plant structures. The coal-ball discovery helps fill a stratigraphic gap in coal-ball occurrences in the upper Carboniferous (Bolsovian) of Euramerica. The autochthonous and hypautochthonous coal-balls have a similar mineralogical composition and are composed of siderite (81-100%), dolomite-ankerite (0-19%), minor quartz and illite, and trace amounts of ‘calcite‘. Similar is also their permineralizing mineralogy, which consists of dolomite-ankerite and siderite. Their low pyrite content and carbonate mineralogy, and nonmarine origin, differentiates the Foord Seam coal-balls from other Euramerican coal-ball occurrences. A preliminary geochemical model, which is based on oxygen and carbon isotopic data, indicates that siderite in both the autochthonous and hypautochthonous coal-balls is of very early diagenetic (nonmarine) origin from 13C-enriched bicarbonate derived from bacterial methanogenesis of organic matter. |
| Genre: | Article |
| ProdID: | 70018871 |
| Citation Author: | Zodrow, E. L.; Lyons, P. C.; Millay, M. A. |
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| Citation End Page: | 216 |
| Citation Issue: | 1-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | International Journal of Coal Geology |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Geochemistry of autochthonous and hypautochthonous siderite-dolomite coal-balls (Foord Seam, Bolsovian, Upper Carboniferous), Nova Scotia, Canada; 1996; Article; Journal; International Journal of Coal Geology; Zodrow, E. L.; Lyons, P. C.; Millay, M. A. |
| Citation Start Page: | 199 |
| Citation Volume: | 29 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Geochemistry of autochthonous and hypautochthonous siderite-dolomite coal-balls (Foord Seam, Bolsovian, Upper Carboniferous), Nova Scotia, Canada; 1996; Article; Journal; International Journal of Coal Geology; Zodrow, E. L.; Lyons, P. C.; Millay, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
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