Evolution of geothermal fluids deduced from chemistry plots: Yellowstone National Park (U.S.A.)
Journal of Volcanology and Geothermal Research
By: E. Mazor and J. M. Thompson
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Abstract
Large amounts of chemical data, obtained in geothermal fields, may readily be sorted-out by the aid of a simple set of graphs that provide a clear over-all picture and facilitate the understanding of geochemical processes taking place. As a case study, data from several hundred samples of the thermal springs at the well-known Yellowstone National Park are discussed. The pattern obtained seems to indicate: (1) geochemical similarity between the spring groups of Heart Lake, Shoshone, Upper, Midway, Lower and Norris Geyser Basins, i.e., a geochemical uniformity of major spring groups located over 40 km apart; (2) these groups may be described as originating from a common fluid, most resembling the composition of Norris waters, accompanied by CO2, and other volatiles, that react with igneous rocks, forming local variations; (3) the secondary reactions occur at (medium) depth, before the ascent to the surface; (4) extensive concentration-dilution processes occur during the ascent to the surface. The water of the Mammoth group may be described as originating from the same Norris-like fluid that has been diluted (low Na and Cl contents) and intensively reacted with carbonaceous rocks, thus gaining in Ca, Mg, SO4, and HCO3. ?? 1982.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Evolution of geothermal fluids deduced from chemistry plots: Yellowstone National Park (U.S.A.) |
| Series title | Journal of Volcanology and Geothermal Research |
| Volume | 12 |
| Issue | 3-4 |
| Year Published | 1982 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Volcanology and Geothermal Research |
| First page | 351 |
| Last page | 360 |
| Google Analytic Metrics | Metrics page |