| Abstract: | A comprehensive geochemical survey of springs outside the northwest margin of the Yellowstone caldera was undertaken in 2003 and 2004. This survey was designed to detect: (1) active leakage from a huge reservoir of CO2 gas recently postulated to extend from beneath the caldera into this area; and (2) lingering evidence for subsurface flow of magmatic fluids into this area during the 1985 seismic swarm and concomitant caldera subsidence. Spring temperatures are low (< 15 ??C), but two large-discharge springs contain 14C-dead carbon that can be identified as magmatic from calculated end-member values for ??13C(dead) and 3He/C(dead) of - 4??? and 1 ?? 10- 10, respectively, similar to values for intra-caldera fumarolic and hot-spring gases. However, the combined discharge of magmatic C is only 5.4 tonnes/day, < 0.1% of the total output from Yellowstone. The two springs have slightly elevated 3He/4He ratios near 1 RA and anomalous concentrations of Cl, Li, and B, and appear to represent minor leakage of gas-depleted, thermal waters out of the caldera. The small CO2 signal detected in the springs is difficult to reconcile with a large underlying reservoir of gas in faulted and seismically active terrain. When considered with analyses from previous decades, the results provide no evidence to associate the ten-year period of caldera deflation that began in 1985 with expulsion of magmatic fluids through the caldera rim in this area. |
| Genre: | Article |
| ProdID: | 70028441 |
| Citation Author: | Evans, W. C.; Bergfeld, D.; van, Soest, M. C.; Huebner, M. A.; Fitzpatrick, J.; Revesz, K. M. |
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| Citation End Page: | 180 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Volcanology and Geothermal Research |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Geochemistry of low-temperature springs northwest of Yellowstone caldera: Seeking the link between seismicity, deformation, and fluid flow; 2006; Article; Journal; Journal of Volcanology and Geothermal Research; Evans, W. C.; Bergfeld, D.; van, Soest, M. C.; Huebner, M. A.; Fitzpatrick, J.; Revesz, K. M. |
| Citation Start Page: | 169 |
| Citation Volume: | 154 |
| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Geochemistry of low-temperature springs northwest of Yellowstone caldera: Seeking the link between seismicity, deformation, and fluid flow; 2006; Article; Journal; Journal of Volcanology and Geothermal Research; Evans, W. C.; Bergfeld, D.; van, Soest, M. C.; Huebner, M. A.; Fitzpatrick, J.; Revesz, K. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.jvolgeores.2006.01.001 |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
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