Abstract
Abstract A regional sampling of gases from thermal springs near the LaBarge Field, Wyoming, USA to determine the extent of the total carbon dioxide system (TCDS) indicates that the system may extend up to 70 km to the northwest of the field. Geochemical evidence from noble gas isotopes, stable element isotopes, and gas composition provide the foundation for these conclusions. Samples from Soda Springs to the west and Grand Teton National Park to the north do not exhibit the potentially diagnostic LaBarge gas chemistry and represent an absolute maximum potential extent of the system. Additional sampling to the south and east as well as in-fill sampling in regions previously sampled are necessary to refine these preliminary TCDS boundaries.
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