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This paper quantifies atmospheric mercury (Hg) emissions from substrates and fumaroles associated with three hydrothermal systems: Lassen Volcanic Center, California (LVC); Yellowstone Caldera, Wyoming (YC); and Dixie Valley, Nevada (DV). Substrate Hg fluxes were measured using field chamber methods at thermal and nonthermal sites. The highest Hg fluxes (up to 541 ng m−2 h−1) were measured at thermal active areas. Fluxes from altered and unaltered nonthermal sites were <10 ng m−2 h−1 and were comparable to those measured in natural low-Hg background regions for YC and DV, and at LVC they were slightly elevated. Similarly, reactive gaseous mercury concentrations were higher in thermal active areas. Using a Geographic...
    map background search result map search result map USGS 1:24000-scale Quadrangle for Mercur, UT 1968 USGS 1:24000-scale Quadrangle for Mercur, UT 1968 USGS 1:24000-scale Quadrangle for Mercur, UT 1993 USGS 1:24000-scale Quadrangle for Mercur, UT 1997 USGS 1:24000-scale Quadrangle for Mercur, UT 1968 USGS 1:24000-scale Quadrangle for Mercur, UT 1968 USGS 1:24000-scale Quadrangle for Mercur, UT 1993 USGS 1:24000-scale Quadrangle for Mercur, UT 1997