HERCYNIAN GRANITOID MAGMATIZM OF THE GREATER CAUCASUS

Okrostsvaridze, Avtandil (2007) HERCYNIAN GRANITOID MAGMATIZM OF THE GREATER CAUCASUS. Other. NERGEBI.

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Abstract

The Greater Caucasus represents a folded-nappe polycyclic geological formation which has been developed as one of the magastrucrutes of the Paleotethys and nowadays it is the North-East segment of the East Mediterranean orogen. Its width reaches 170 km and it is stretched of 1200 km between the Black and Caspian Seas to the NW-SE direction. Two major stages are distinguished in its formation: Pre-Alpine and Alpine. Pre-Alpine formation makes a heterogeneous crystalline basement complex, the exposed part of which is 200 km long and the width reaches 40 km (Figure 1). It is mainly constructed of Caledonian and Hercynian crystalline schist, amphibolites, granitgneisses, migmatites and granitoids. Four regional structural zones are distinguished in this basement (from the South to the North): Southern slope, Main range, Front range and Bechasyn. During the Alpine tectonic-magmatic activisation these units underwent several tectonic uplifts and as a result of these ororgenic processes the crystalline basement of the Greater Caucasus acquired the up to date structural face. The Main range zone is the best exposing part of the crystalline basement of the Greater Caucasus. Different from the other zones, Hercynian metamorphism and granitoid magmatism are intensively represented in this unit. Metamorphism rate ranges from green schist facies to granulite, but amphibolite facies is mostly found (Shengelia et al., 1991). Hercynian granitoid magmatizm has been studied in some of the regions of the crystalline basement of the Greater Caucasus, but there does not exist its thorough petrogenetical model and our task is to creat the model, which would thorougly reflec the conditions of formation, the way of evolution and ore-forming potential of this magmatizm.

Item Type: Monograph (Other)
Subjects: Q Science > QE Geology
Divisions: Institutes > Institute of Earth Sciences
Depositing User: ავთანდილ ოქროსცვარიძე
Date Deposited: 18 Aug 2017 07:55
Last Modified: 18 Aug 2017 07:55
URI: http://eprints.iliauni.edu.ge/id/eprint/6623

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