The peculiarity of extrusive rocks of Mendeleev Volcano draws attention of researchers. According to previous research, the Mendeleev Volcano is telescoping caldera, composed of two shafts, the central cone and final extrusion. However, there are no any cuts that characterize the morphological structure of these elements, in the literature. Conducted in 1991, field studies have allowed us to design a more simple circuit of Mendeleev Volcano structure, as well as the study of the cut of Mechnikov Mountain's caldera shaft enabled us to offer the following explanation of the genesis of the extrusion of the Mendeleev Mountain.
Basalts that filled the peripheral focus of Mendeleev Volcano evolved till andesite-dacite by fractional crystallization. Fluid accumulation in the chamber has led to liquid immiscibility of residual magma to dacitic and andesitic compositions. Being thrown out with final explosion they formed a patch of contrast rocks: white dacitic pumices and black andesitic slags. Magma remnants of contrast compositions, losing fluids, were pressed out as andesite-dacite extrusions containing anomalous phenocrysts parageneses.