Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate ground waters

Details Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate ground waters Stable carbon isotope ratios and the existence of a gas phase in the evolution of carbonate ground waters

Jul 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38.1147d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 7, pp.1147-1164

Physics

55

Scientific paper

The chemical and stable isotope compositions of unpolluted ground waters in carbonate terranes are a function of the pH, P CO 2 , 13 C content of the ground water recharge, the 13 C content of the carbonate rock, and the manner in which the rock is dissolved or precipitated. Physico-chemical models show that significantly different relationships exist between Ca 2+ plus Mg 2+ , HCO 3 - , pH and 13 C content of unpolluted ground waters when carbonate solution occurs in the presence or absence of a gas phase. A study was made of these relationships in waters from 21 springs and 13 wells in Nittany Valley, Pennsylvania. Assuming that CO 2 in the recharge zone has a 13 C contents below -21%. vs PDB, the data indicate that ground water flow to wells and springs, and carbonate rock solution probably occurs chiefly in the absence of a gas phase. This is in spite of the fact that most of such flow is under water table conditions. 13 C contents averaged -12·3%. for the spring waters and -13·3%. for the well waters. Five well waters polluted by septic tank or sewage effluents had carbon isotopic compositions from -13·5 to -16·4%.,vs -11·3 to-12·7 %. for the eight well waters relatively free of organic wastes.

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