TY JOUR TI Integrated Geophysical Cluster Analysis for the Tectonic Zonation of the West Siberian Lithosphere KW West Siberian Basin KW cluster analysis KW tectonic zonation KW integrated geophysical analysis KW surface heat flow KW lithospheric thickness JO Russian Journal of Earth Sciences AU Petrunin, A.G. AU Kaban, M.K. AU Fuchs, S.. AU Shevaldysheva, O.O. PY 2026 IS 26 PB Geophysical Center of the Russian Academy of Sciences