RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 9, ES1002, doi:10.2205/2007ES000221, 2007

Results

[28]  Figure 1 shows the distribution of strontium isotope ratios and Mn/Sr and Fe/Sr ratios for the most representative series of samples from the Upper Kazanian of the Pechishchi section. Table 1 gives average isotopic and geochemical characteristics of the Permian composite stratigraphic sequence.

[29]  The general structure of these data satisfies the test criteria Mn/Sr < 5 and Fe/Sr < 20.

[30]  Analysis of the ( 87Sr/86Sr)0 ratios determined for the section shows that the highest ratios, characteristic of the Asselian, average at 0.70832. In the Artinskian, the ( 87Sr/86Sr)0 ratios decrease to 0.70774. In the Kazanian, the strontium ratio is much lower: 0.70769 in the Early Kazanian (Table 1) and 0.70725 to 0.70766 in the Late Kazanian (Figure 1). The Perekhodnaya member is characterised by a ratio of 0.70738 corresponding to the boundary between the Kazanian and Urzhumian dated as ca. 266.8 Ma [Gradstein et al., 2004].


RJES

Citation: Nurgalieva, N. G., V. A. Ponomarchuk, and D. K. Nurgaliev (2007), Strontium isotope stratigraphy: Possible applications for age estimation and global correlation of Late Permian carbonates of the Pechishchi type section, Volga River, Russ. J. Earth Sci., 9, ES1002, doi:10.2205/2007ES000221.

Copyright 2007 by the Russian Journal of Earth Sciences

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