Abstract
The Masjed Daghi mineralization is located 30 km southeast of Jolfa city at the bank of Araxes River, northwest Iran. This area is situated in the Alborz-Azarbaijan structural zone of Iran. The most widespread rocks in the mineralization area are andesite and trachyandesite, while there are rock units of latite tuff, andesitic agglomerate, and hornblende porphyry basalt in eastern hills and Eocene flysch in the southern part of the area. Several intrusive bodies are present in the study area, from which the dominant intrusive rock hosting the mineralization is diorite porphyry. The mineralized rock units of the area are cut by different diorite ad mafic dikes. The most prevalent texture of mineralization is dissemination, while open space filling textures including veins and veinlets, are common as well. Diverse types of alteration including potassic, phyllic, argillic, silicification, and a little of carbonatization were recognized in the field and microscopic observations as well as by XRD. In addition to thick silica veins and stockwork zones, some silica, barite, sulfide, and calcite veins and veinlets have occurred in the Masjed Daghi mineralization area. In this research, 26 doubly polished thin sections (wafers) were prepared and investigated. Four samples were taken from surface veins, while 22 samples were chosen from core samples (of 6 boreholes) of white and grey-white silica, and silica-barite veins. The fluid inclusion studies on 105 primary fluid inclusions indicated five phases for inclusions including: 1) liquid or gas, 2) liquid and gas, 3) liquid, gas, and solid, 4) liquid, gas, halite, and solid, and 5) liquid, gas, halite, and two types of solids. The data gained from fluid inclusions approved two mineralization fluids which caused porphyry and epithermal mineralizations. The porphyry fluid inclusions were homogenized in temperatures of 122°C to 550°C with a maximum of 700°C and average salinity of 55 wt% NaCl equivalent, while the epithermal inclusions indicated an average homogenization temperature of 186°C with an average salinity of 6.23 wt% NaCl equivalent.
Highlights
The Masjed Daghi mineralization, with general coordinates of 38 ̊52'40''N and 45 ̊56'25''E, is located 30 km southeast of Jolfa city at the bank of Araxes River, northwest Iran
There is little attention given to research on the mentioned topic, especially in Iran, which is the main reason to carry out this research; the present study tries to investigate fluid inclusion of the Masjed Daghi Copper-Gold Porphyry-Epithermal Mineralization, East Azerbaijan Province, NW Iran
B) Two-phase liquid and gas, rich in gas (V + L): In this type of inclusions observed in white silica veins, about 85% to 95% of the inclusion is filled with gas, while 5% to 15% of it is occupied by liquid phase
Summary
The Masjed Daghi mineralization, with general coordinates of 38 ̊52'40''N and 45 ̊56'25''E, is located 30 km southeast of Jolfa city at the bank of Araxes River, northwest Iran. The exploration of Masjed Daghi mineralization area was commenced in 2000 by the Geological Survey of Iran (GSI) by means of preparation of 1:3000 and 1:5000 geologic maps, rock sampling, and digging 18 exploration boreholes [1]. By recognizing some gold-copper anomalies, the exploration was continued with the digging of 16 exploration boreholes with the total length of 1882 meters [2]. There is little attention given to research on the mentioned topic, especially in Iran, which is the main reason to carry out this research; the present study tries to investigate fluid inclusion of the Masjed Daghi Copper-Gold Porphyry-Epithermal Mineralization, East Azerbaijan Province, NW Iran
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