Table 1.

Sample location, total dissolved (<0.2 μm) geochemical parameters, and predominant solid phases associated with high-temperature, archaeal-dominated microbial communities in Yellowstone National Park (YNP).

I, ionic strength calculated from aqueous geochemical modeling at sample temperature; DIC, dissolved inorganic C; DS, dissolved sulfide; S₂O₃², thiosulfate; DO, dissolved oxygen.

¹Predominant solid phases determined using scanning electron microscopy (FE-SEM) coupled with energy dispersive analysis of X-rays (EDAX) and X-ray diffraction (XRD).

²pH values at these sites have been noted to vary (MG_3; pH ∼ 4–4.5; CIS_19; pH ∼ 4.4–4.9). Also, see USGS reports (e.g., Ball et al., 1998, 2002; McCleskey et al., 2005).