| Abstract: | Magnetization measurements have been made on natural coke-coal samples collected at various distances from a felsic porphyry dike in a coal seam in Dutch Creek Mine, Colorado to help characterize the nature and distribution of the iron-bearing phases. The magnetization passes through a maximum at the coke-to-coal transition about 31 cm from the dike contact. The magnetic measurements support the geochemical data indicating that magmatic fluids along with a high-temperature gas pulse moved into the coal bed. Interaction of the magmatic fluids with the coal diminished the reducing power of the thermal gas pulse from the dike to a point about 24 cm into the coal. The hot reducing gas penetrated further and produced a high temperature (~400-525??C) zone (at about 31 cm) just ahead of the magmatic fluids. Metallic iron found in this zone is the principal cause of the observed high magnetization. Beyond this zone, the temperature was too low to alter the coal significantly.Magnetization measurements have been made on natural coke-coal samples collected at various distances from a felsic porphyry dike in a coal seam in Dutch Creek Mine, Colorado to help characterize the nature and distribution of the iron-bearing phases. The magnetization passes through a maximum at the coke-to-coal transition about 31 cm from the dike contact. The magnetic measurements support the geochemical data indicating that magmatic fluids along with a high-temperature gas pulse moved into the coal bed. Interaction of the magmatic fluids with the coal diminished the reducing power of the thermal gas pulse from the dike to a point about 24 cm into the coal. The hot reducing gas penetrated further and produced a high temperature (approximately 400-525 ??C) zone (at about 31 cm) just ahead of the magmatic fluids. Metallic iron found in this zone is the principal cause of the observed high magnetization. Beyond this zone, the temperature was too low to alter the coal significantly. |
| Genre: | Article |
| ProdID: | 70020843 |
| Citation Author: | Thorpe, A. N.; Senftle, F. E.; Finkelman, R. B.; Dulong, F. T.; Bostick, N. H. |
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| Citation End Page: | 258 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | International Journal of Coal Geology |
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| Citation Number Of Pages: | 16 |
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| Citation Publisher: | Elsevier Sci B.V. |
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| Citation Search Results Text: | Change in the magnetic properties of bituminous coal intruded by an igneous dike, Dutch Creek Mine, Pitkin County, Colorado; 1998; Article; Journal; International Journal of Coal Geology; Thorpe, A. N.; Senftle, F. E.; Finkelman, R. B.; Dulong, F. T.; Bostick, N. H. |
| Citation Start Page: | 243 |
| Citation Volume: | 36 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Change in the magnetic properties of bituminous coal intruded by an igneous dike, Dutch Creek Mine, Pitkin County, Colorado; 1998; Article; Journal; International Journal of Coal Geology; Thorpe, A. N.; Senftle, F. E.; Finkelman, R. B.; Dulong, F. T.; Bostick, N. H. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0166-5162(98)00006-8 |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
| Publisher: | Elsevier Sci B.V. |
