**Author details**

In the mafic volcanics of the behavior of major elements indicate their origin by fractionation of olivine, clinopyroxene, hornblende, basic plagioclase, apatite, magnetite. Acidic volcanic rocks associated with the formation of "dry" high temperature of the melt in the intermediate chambers are not of fractional crystallization. The distribution of rare earth elements in rocks trachybasalt-trachyandesite formation indicates that the source was the metasomatic alteration of volcanic rocks containing garnet mantle. In the studied volcanics, (Tb/Yb)n = 1.7–3.0 indicates the

In the rocks of rhyolite formation contents of rare earth elements is low (REE = 66–116 ppm), there is a pronounced low ratio of europium, which indicates

Trace element composition of the rocks trachybasalt-trachyandesite formation and their relationships complicate the model and determine the fractional crystallization of the magma mantle interaction with the substrate of the crust. In this substrate can be rhyolites, geochemical, and isotopic composition similar to the Earth's crust and forming a spatio-temporal association with the rocks contrast

The simulation revealed that the evolution of moderately alkaline olivine basalts (considered a primary mantle melt the rocks trachybasalt-trachyandesite formation) occurs due to changes in the composition of the main rock-forming and accessory minerals. Average rock formations formed by the assimilation of poorly differentiated primary magma acidic melt. Geochemical features of moderately alkaline olivine basalts indicate that the source of magma is metasomaticized, phlogopite-garnet-rutile containing lithospheric mantle. It is very possible that the melting of such a source is rutile to a restaurant, and magma is depleted Nb

The calculations have shown that the proportion of melting rhyolitic melt separated from andesite substrate close to 15%. After removal of the remaining melt restite entirely consistent with the composition of the lower crust. The typical ratio

These fact sheets, model calculations indicate various sources of education salic and mafic melts. Thus, the generation of mafic melt (moderately alkaline olivine basalt composition) came from a differentiated mantle protolith formation of a salic melt occurs during lifting mafic magma by melting of crustal substrate. On the other hand, the salic is going to melt in the top of the magma reservoir and prevents lifting heavier mafic magma, and in a short time in the melt is subjected to intermediate focuses differentiated. During subsequent evolution differentiated mafic melt reacts with rhyolitic melt, which entails the formation of secondary rocks. Thus, the formation of bimodal volcanism in contrast, the central part of the

Temporary space conjugate crust and mantle magmatism led to the introduction of mantle melts under tension in the lower crust, which led to its melting and the formation of acidic volcanic rocks enriched in radiogenic *Sr* and *Nd* (rhyolite formation). At the same time in this situation, a change of scenery compression tensile contributed to the manifestation of poorly differentiated volcanism. At the same time, the evolution of the melt in the earth's crust is dominated by a single process of AFC (assimilation and fractional crystallization), and intermediate chambers became necessary mixing of mafic (trachybasalt) and salic (rhyolite) melts and created the conditions for the formation of intermediate rocks. However, due to different densities and viscosities of melts, salic mafic and such mixing occurred in

Thus, in the petrogenesis of the majority of Caucasian young volcanic rocks has played a significant role lower mantle source material which is close to the tank

Lesser Caucasus in the Late Pliocene-Quaternary period is as follows.

presence of garnet in the source of the primary magma.

*Updates in Volcanology – Transdisciplinary Nature of Volcano Science*

trachybasalt-trachyandesite formation.

of rare earth elements is to confirm this.

and Ta.

small quantities.

**66**

that early removal of the molten plagioclase and alkali feldspar.

Nazim Imamverdiyev<sup>1</sup> \* and Anar Valiyev<sup>2</sup> \*

1 Department of Geology, Baku State University, Baku, Azerbaijan

2 Azerbaijan National Academy of Sciences, Institute of Geology, Baku, Azerbaijan

\*Address all correspondence to: inazim17@yahoo.com and velizade\_anar@yahoo.com

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
