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The aim of this study is to investigate the nature of the solutions and the temperature during the bentonite formation by using δ 18 O and δ 2 H values and the relationship between chemical and isotopic composition of smectites from Cabo de Gata region. Therefore, 36 bentonite samples had been selected. For analyses the 18 O and δ 2 H values above and below this line, respectively. Temperatures obtained from geothermometer equation are similar to the temperatures values obtained from the equation of Savin and Lee (1988) . Estimated formation temperatures of SG type are 25 and 49 °C higher compared to those of the SN type (6 and 25 °C). Correlations between structural cations versus isotopic composition show no statistical significance concerning all samples. However, separating the samples of SG (Sierra de Gata) from SN (Serrata of Nijar) a statistical significance for the individual areas is obtained. In both cases the effect is similar for 18 O and for 2 H. This could be due to the different composition of the solutions forming these bentonites. |
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