Meteoric Water in Magmas
Friedman I, Lipman PW, Obradovich JD, Gleason JD, Christiansen RL. 1974. Meteoric Water in Magmas. Science. 184(4141):1069-1072
Oxygen isotope analyses of sanidine phenocrysts from rhyolitic sequences in Nevada, Colorado, and the Yellowstone Plateau volcanic field show that _(superscript 18)O decreased in these magmas as a function of time. This decrease in _(superscript 18)O may have been caused by isotopic exchange between the magma and groundwater low in (superscript 18)O. For the Yellowstone Plateau rhyolites, 7,000 cubic kilometers of magma could decrease in _(superscript 18)O by 2 per mil in 6000,000 years by reacting with water equivalent to 3 millimeters of precipitation per year, which is only 0.3% 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.
- Type
- Journal Article
- Authors
- Friedman, Irving; Lipman, Peter; Obradovich, John; Gleason, Jim; Christiansen, Robert
- Units
- YELL
- Keywords
- Geology, Isotopic Dating, Magma, Oxygen (O), Oxygen Isotopes, Rhyolites, Volcanic Activity, Water