Evolution of geothermal fluids deduced from chemistry plots: Yellowstone National Park (U.S.A.)
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.
Citation Information
Publication Year | 1982 |
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Title | Evolution of geothermal fluids deduced from chemistry plots: Yellowstone National Park (U.S.A.) |
Authors | E. Mazor, J. M. Thompson |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Journal of Volcanology and Geothermal Research |
Index ID | 70011678 |
Record Source | USGS Publications Warehouse |