Other
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1885p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 42, Issue 12, pp.1885-1897
Other
Scientific paper
Precipitation, soil and spring waters from an outlier of Chalk were analysed over a one year period for field pH, and contents of Ca +2 , Mg +2 , HCO 3 - and other dissolved solids. Measured soil log PCO 2 (atm) varied between a minimum of -2.60 and maximum of -1.46, and could be predicted from measurements of soil temperature. Soil waters evolved under open system conditions with respect to soil CO 2 , and were undersaturated with calcite during the winter recharge period. The chemistry of the springs is related to their topographic position. Group 1 springs, located below a feather edge of chalk, had both their minimum and maximum PCO 2 s predicted by the soil CO 2 data, suggesting open system CO 2 evolution. Group 2 springs, located along the scarp slope had minimum PCO 2 s predicted by the soil data, but maximum PCO 2 s which could only be explained by a closed system evolution from the maximum soil CO 2 observed. Group 1 springs were close to calcite saturation, whereas Group 2 springs were significantly undersaturated with calcite. The two groups could be identified by linear discriminant analysis of measured Ca 2+ , pH and HCO 3 - concentrations.
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