| Abstract: | We report here on the use of solid-state 13C nuclear magnetic resonance (NMR) spectroscopy to contrast the average chemical composition of modern degraded gymnosperm woods with fossil gymnosperm woods from Australian brown coals (Miocene). We first established the quantitative nature of the NMR techniques for these samples so that the conventional solid-state 13C NMR spectra and the dipolar dephasing NMR spectra could be used with a high degree of reliability to depict average chemical compositions. The NMR results provide some valuable insights about the early coalification of xylem tissue from gymnosperms. Though the cellulosic components of wood are degraded to varying degrees during peatification and ensuing coalification, it is unlikely that they play a major role in the formation of aromatic structures in coalified woods. The NMR data show that gynmosperm lignin, the primary aromatic contribution to the coal, is altered in part by demethylation of guaiacyl-units to catechol-like structures. The dipolar dephasing NMR data indicate that the lignin also becomes more cross-linked or condensed. ?? 1989. |
| Genre: | Article |
| ProdID: | 70016104 |
| Citation Author: | Hatcher, P. G.; Lerch, III, H. E.; Bates, A. L.; Verheyen, T. V. |
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| Citation End Page: | 155 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Organic Geochemistry |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Solid-state 13C nuclear magnetic resonance studies of coalified gymnosperm xylem tissue from Australian brown coals; 1989; Article; Journal; Organic Geochemistry; Hatcher, P. G.; Lerch, III, H. E.; Bates, A. L.; Verheyen, T. V. |
| Citation Start Page: | 145 |
| Citation Volume: | 14 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Solid-state 13C nuclear magnetic resonance studies of coalified gymnosperm xylem tissue from Australian brown coals; 1989; Article; Journal; Organic Geochemistry; Hatcher, P. G.; Lerch, III, H. E.; Bates, A. L.; Verheyen, T. V. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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