TY JOUR TI Strontium isotope stratigraphy: Possible applications for age estimation and global correlation of Late Permian carbonates of the Pechishchi type section, Volga River KW strontium isotopic stratigraphy KW 87Sr/86Sr ratio KW Permian rocks KW carbonates KW evaporates. JO Russian Journal of Earth Sciences AU Nurgalieva, N.G. AU Ponomarchuk, V.A. AU Nurgaliev, D.K. PY 2007 IS 9 PB Geophysical Center of the Russian Academy of Sciences