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A total of 117 water samples, including cave water, ground water, spring water and river water, collected from the monsoonal area of China have been analyzed for their H- and O-isotope composition. Overall, a δ 18 O–δD correlation is observed of δD=−4.45+6.6δ 18 O (R 2 =0.90) and a significant evaporation effect observed for the southern sites. Average δ 18 O and δD...
Isotope ratios of U and Pb were measured in two types of Mn nodules from the Cambrian Timna Formation, Israel. Type A nodules are mainly composed of pyrolusite and hollandite, with Mn, Ba, Pb and U concentrations of 30-60%, 0.2-2.5%, 0.2-1.0% and 500-3500 ppm, respectively, whereas type B nodules were formed by alteration of the former, and contain mainly coronadite, with Mn, Ba, Pb and U concentrations...
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