Other
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2547s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 12, pp.2547-2561
Other
7
Scientific paper
A total of 268 thermal spring samples were analyzed for total soluble As using reduced molybdenum-blue; 27 of these samples were also analyzed for total Sb using flame atomic absorption spectrometry. At Yellowstone the Cl / As atomic ratio is nearly constant among neutral-alkaline springs with Cl > 100 mg L -1 , and within restricted geographic areas, indicating no differential effects of adiabatic vs . conductive cooling on arsenic. The Cl / As ratio increases with silica and decreases with decreasing Cl / CO 3 ; the latter relationship is best exemplified for springs along the extensively sampled SE-NW trend within the Lone Star-Upper-Midway Basin region. The relationship between Cl / As and Cl / CO 3 at Yellowstone suggests a possible rock leaching rather than magmatic origin for much of the Park's total As flux. Condensed vapor springs are low in both As and Cl. Very high Cl / As ratios ( > 1000) are associated exclusively with highly diluted (Cl < 100 mg L -1 ) mixed springs in the Norris and Shoshone Basins and in the Upper White Creek and Firehole Lake areas of Lower Basin. The high ratios are associated with acidity and/or oxygen and iron; they indicate precipitation of As following massive dilution of the Asbearing high-Cl parent water. Yellowstone Sb ranged from 0.009 at Mammoth to 0.166 mg L -1 at Joseph's Coat Spring. Within basins, the Cl / Sb ratio increases as the Cl / CO 3 ratio decreases, in marked contrast to As. Mixed springs also have elevated Cl / Sb ratios. (1967) and (1969) previously reported stibnite (Sb 2 S 3 ), but not orpiment (As 2 S 3 ), precipitating in the near surface zone of alkaline geothermal systems.
Stauffer Robert E.
Thompson Michael J.
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