| Abstract: | D/H and 18O 16O ratios have been determined for fumarole condensates from Augustine Volcano, an active calc-alkaline stratovolcano in Lower Cook Inlet, Alaska. The isotopic data for the condensates form a linear ?? D-?? 18O array from low-temperature fluids (< 100??C) which are essentially local meteoric water (?? D {reversed tilde equals} -150???, ?? 18O {reversed tilde equals} -19???) to high-temperature (>450??C) fluids collected at the volcano summit which are enriched in both D and 18O (?? D {reversed tilde equals} -35???, ?? 18O {reversed tilde equals} +3.5???). Several lines of evidence suggest that the D-and 18O-rich condensates likely are "magmatic" fluids released into the hydrothermal system during and immediately after the 1976 eruption. Prior to 1976, the Augustine hydrothermal system was dominated completely by local meteoric waters. Between 1976 and 1982, fumarole condensates were observed to be variable mixtures of the "magmatic" fluid and meteoric water, with the proportion of the former systematically decreasing as the hydrothermal system cooled following the 1976 eruption. ?? 1985. |
| Genre: | Article |
| ProdID: | 70012728 |
| Citation Author: | Viglino, J. A.; Harmon, R. S.; Borthwick, J.; Nehring, N. L.; Motyka, R. J.; White, L. D.; Johnston, D. A. |
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| Citation End Page: | 157 |
| Citation Issue: | 1-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Chemical Geology |
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| Citation Number Of Pages: | 17 |
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| Citation Publisher: | Elsevier |
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| Citation Search Results Text: | Stable-isotope evidence for a magmatic component in fumarole condensates from Augustine Volcano, Cook Inlet, Alaska, U.S.A.; 1985; Article; Journal; Chemical Geology; Viglino, J. A.; Harmon, R. S.; Borthwick, J.; Nehring, N. L.; Motyka, R. J.; White, L. D.; Johnston, D. A. |
| Citation Start Page: | 141 |
| Citation Volume: | 49 |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | Stable-isotope evidence for a magmatic component in fumarole condensates from Augustine Volcano, Cook Inlet, Alaska, U.S.A.; 1985; Article; Journal; Chemical Geology; Viglino, J. A.; Harmon, R. S.; Borthwick, J.; Nehring, N. L.; Motyka, R. J.; White, L. D.; Johnston, D. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0009-2541(85)90152-4 |
| Date Other: | Tue, 1 Jan 1985 00:00 -0600 |
| Publisher: | Elsevier |
