The presented paper is dedicated to the study of the formation of the Gadabay-Soyudlu intrusion of Upper Jurassic – Lower Cretaceous age based on complex geological-mineralogical researches. As a result, it was proved that the intrusion and its comagmatic volcanic analogues have been formed within the mature volcanic island arc setting. By the results of titaniferous magnetite-ilmenite and pyroxene thermobarometers gabbroid rocks of the first phase have been crystallized in the high thermobaric conditions. Ni (millerite) and Co (cobaltite) ore minerali-zations related to this phase of the intrusion are found in the rocks. The vein rocks of the gabbroid phase are fine grained crystalline rocks such as micro-gabbro, spessartite, diabase. Rock members of the gabbroid phase have been formed under the control of crystallization-differentiation in magmatic chambers located in the upper crust under relatively high thermobaric conditions.
The derivatives of the quartz-diorite or second phase crystallized under the lower thermobaric conditions (T ≈ 780°C). The vein rocks of this phase are aplite and granite-pegmatite occurring in the areoles of the second phase. The second phase has also formed within the upper crust, but crystallization temperature was dropped and partial pressure of oxygen was increased.
Both first phase and second phase derivatives have been crystallized from the primary tholeiitic magma relatively enriched in Al2O3 within the mature volcanic island arc setting under the control of differential crystallization process.
The gold-pyrite, gold-polymetallic and gold-barite-copper-polymetallic ore mineralization were justified to be related to the quartz diorite phase magmatism.

 

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