HR: 1340h
AN: V53B-1330    [Abstracts]
TI: Volatile Emissions from Hot Spring Basin, Yellowstone National Park, USA
AU: * Werner, C
EM: cwerner@usgs.gov
AF: US Geological Survey, 1300 SE Cardinal Ct., Vancouver, WA 98683, United States
AU: Hurwitz, S
EM: shaulh@usgs.gov
AF: US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025, United States
AU: Bergfeld, D
EM: dbergfel@usgs.gov
AF: US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025, United States
AU: Evans, W C
EM: wcevans@usgs.gov
AF: US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025, United States
AU: Lowenstern, J B
EM: jlwnstrn@usgs.gov
AF: US Geological Survey, 345 Middlefield Rd., Menlo Park, CA 94025, United States
AU: Jaworowski, C
EM: Cheryl_Jaworowski@nps.gov
AF: Yellowstone Center for Resources, Yellowstone National Park, Mammoth, WY 82190, United States
AU: Heasler, H
EM: Henry_Heasler@nps.gov
AF: Yellowstone Center for Resources, Yellowstone National Park, Mammoth, WY 82190, United States
AB: The flux and composition of magmatic volatiles were characterized for Hot Spring Basin (HSB), Yellowstone National Park, in August 2006. Diffuse fluxes of CO₂ (228 sites) from thermal soil were elevated, with a population distribution similar to that of other acid-sulfate areas in Yellowstone. Thus the estimated diffuse emission rate at HSB is proportionately larger than other areas due to its large area, and could be as high as 1000 td^-1 CO₂. The diffuse flux of H₂S was only above detection limits at 20 of the 31 sites measured. The estimated diffuse H₂S emission rate was ~ 4 td^-1. Good correlation exists between the log of CO₂ flux and shallow soil temperatures, indicating linked steam and gas upflow in the subsurface. The correlation between CO₂ and H₂S fluxes is weak, and the CO₂ / H₂S diffuse flux ratio was higher than in fumarolic ratios of CO₂ to H₂S. This suggests that various reactions, e.g., native sulfur deposition, act to remove H₂S from the original gas stream in the diffuse low- temperature environment. Dissolved sulfate flux through Shallow Creek, which drains part of HSB, was ~ 4 td^-1. Comparing dissolved sulfate flux to estimates of primary emission of H₂S based on fumarolic gas geochemistry gives first order estimates of the sulfur consumed in surficial or subsurface mineral deposition. Total C and S outputs from HSB are comparable to other active volcanic systems.
DE: 1034 Hydrothermal systems (0450, 3017, 3616, 4832, 8135, 8424)
DE: 8410 Geochemical modeling (1009, 3610)
DE: 8430 Volcanic gases
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting