| Abstract: | Oxygen isotope analyses of sanidine phenocrysts from rhyolitic sequences in Nevada, Colorado, and the Yellowstone Plateau volcanic field show that ??18O decreased in these magmas as a function of time. This decrease in ??18O may have been caused by isotopic exchange between the magma and groundwater low in 18O. For the Yellowstone Plateau rhyolites, 7000 cubic kilometers of magma could decrease in ??18O by 2 per mil in 600,000 years by reacting with water equivalent to 3 millimeters of precipitation per year, which is only 0.3 percent of the present annual precipitation in this region. The possibility of reaction between large magmatic bodies and meteoric water at liquidus temperatures has major implications in the possible differentiation history of the magma and in the generation of ore deposits. |
| Genre: | Article |
| ProdID: | 70011097 |
| Citation Author: | Friedman, I.; Lipman, P. W.; Obradovich, J. D.; Gleason, J. D.; Christiansen, R. L. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 1072 |
| Citation Issue: | 4141 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Science |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 4 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Meteoric water in magmas; 1974; Article; Journal; Science; Friedman, I.; Lipman, P. W.; Obradovich, J. D.; Gleason, J. D.; Christiansen, R. L. |
| Citation Start Page: | 1069 |
| Citation Volume: | 184 |
| Citation Year: | 1974 |
| Type: | citation/reference |
| Text: | Meteoric water in magmas; 1974; Article; Journal; Science; Friedman, I.; Lipman, P. W.; Obradovich, J. D.; Gleason, J. D.; Christiansen, R. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1974 00:00 -0600 |
| Publisher: | |
