Abstract
Gadir deposit is located in the East of Yogundag, near Gedabek deposit, also, Shamkir uplift of the Lok-Karabakh structural-formation zone in the Lesser Caucasus Mega-anticlinorium of Azerbaijan. The deposit has complicated geological structure, and consists of different age and different composite intrusive bulks and fracture structure consisted of complicated with Middle and Upper Jurassic sediments. A structural position of Yogundag area (also, Gadir) predetermined a set of magmatic complexes and a character of magmatism occurrence for Gedabek-Bittibulag deeper fault direction as a whole including the investigated area where are widely developed a set of volcano-pluton formations and volcanism of central character. Gadir was first suggested as a low sulfidation epithermal deposit type by Gedabek Exploration Geologists (2014) following field work and geological interpretation. The Gadir deposit is belong to Pb-Zn-Cu-Ag-Au vein deposit which is characteristic to Low Sulfidation epithermal deposit. The main ore minerals are sulfides. Sulfides consist of pyrite, sphalerite, galena, and trace amounts of chalcopyrite.
Highlights
The Lesser Caucasus is part of the Tethys metallogenic belt, which is one of the world’s major metal producing belts
This study provides new data on the geological of the NW Flank of Gedabek porphyry-epithermal deposit, and a new insight into the lithological-structural, hydrothermal alteration and mainly mineralogical formation of the Gadir low sulfidation epithermal deposit
Geochemistry carried out on various magmatic rocks from the Gedabek ore district indicate a calc-alkaline composition for the magmatism related to the subduction setting of the Lok-Karabakh volcanic arc, with basaltic to andesitic compositions [10]
Summary
The Lesser Caucasus is part of the Tethys metallogenic belt, which is one of the world’s major metal producing belts. The formation of various types of ore deposit in the Lesser Caucasus is related to three major tectonic settings associated with the closure of the Tethys Ocean: (1) the subduction of the Tethys during the middle-Jurassic-early Cretaceous; (2) the collision stage associated with the closure of the Tethys during the upper-Cretaceous, and (3) different post-collisional processes occurring during the Cenozoic. This study provides a preliminary description of the subduction related Gedabek ore district, located in the Jurassic-Cretaceous Lok-Karabakh volcanic arc, and considered as the biggest porphyry-epithermal ore field of Azerbaijan. A more detailed study of the Gedabek deposit is proposed here to better characterize the formation processes of this controversial epithermal deposit, still preserved despite its Mesozoic setting
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