| Abstract: | Laboratory experiments were carried out to determine the magnitude of the isotopic fractionation of distilled water and of 0.01 N NaCl forced to flow at ambient temperature under a hydraulic pressure drop of 100 bars across a montmorillonite disc compacted to a porosity of 35 per cent by a pressure of 330 bars. The ultrafiltrates in both experiments were depleted in D by 2.5%. and in O18 by 0.8%. relative to the residual solution. No additional isotopic fractionation due to a salt filtering mechanism was observed at NaCl concentrations up to 0.01 N. Adsorption is most likely the principal mechanism which produces isotopic fractionation, but molecular diffusion may play a minor role. The results suggest that oxygen and hydrogen isotopic fractionation of ground water during passage through compacted clayey sediments should be a common occurrence, in accord with published interpretations of isotopic data from the Illinois and Alberta basins. ?? 1973. |
| Genre: | Article |
| ProdID: | 70009772 |
| Citation Author: | Coplen, T. B.; Hanshaw, B. B. |
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| Citation End Page: | 2310 |
| Citation Issue: | 10 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 16 |
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| Citation Search Results Text: | Ultrafiltration by a compacted clay membrane-I. Oxygen and hydrogen isotopic fractionation; 1973; Article; Journal; Geochimica et Cosmochimica Acta; Coplen, T. B.; Hanshaw, B. B. |
| Citation Start Page: | 2295 |
| Citation Volume: | 37 |
| Citation Year: | 1973 |
| Type: | citation/reference |
| Text: | Ultrafiltration by a compacted clay membrane-I. Oxygen and hydrogen isotopic fractionation; 1973; Article; Journal; Geochimica et Cosmochimica Acta; Coplen, T. B.; Hanshaw, B. B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1973 00:00 -0600 |
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