Geological and geochemical studies in the Meshkinshahr polymetal zone
Geodad Consulting Engineers
The current study was conducted under a contract between Industries and Mines Organization of Ardebil and Geodad Consulting Engineers. The aim of project was geological and geochemical assessments of semi-detailed exploration of the Meshkinshahr Polymetal zone. The first section of report addresses the geology of the area at 1:20000 scale.
The study area consists of two zones including Doust Beiglu and Khanbaz. The Doust Beiglu area is located 27 Km away from the north of Meshkinshahr city, at northeast of same viallge, between 47 32' 33" to 47 35' 58"E and 38 32' 05" to 38 34' 17"N. the Khanbaz area is located 29 Km away from northwest of Meshkinshahr, 3 Km away from east of Meshkinshahr-Ahar road, between 47 32' 33" to 47 34' 58"E and 38 32' 05" to 38 33' 45"N. the deposit has occurred in a mountainous region at north of the Khanbaz village.
All available documents were collected that include 1:50000 topography maps, 1:250000 and 1:100000 geology maps, 1:20000 aerial photos and the reports of former studies. After determination of the boundary of study area for 1:50000 geology mapping, the zone was drawn on the 1:20000 photographs. Production of 1:5000 aerial photographs from the area ordered to the National Cartographic Center. Photogeology and interpretation of 1:5000 photos followed by preparation of draft geology maps. Several groups of experts traveled to the field for geological survey and controlling the contacts and sampling. All the area was covered by 50-m distant profiles. 41 thin sections, 3 polished sections, 13 XRF and 15 XRD were also studied.
Geochemical study was done on a 50 * 50 m network. 177 samples were taken by two-dimensional method in which each cell was sampled by 15 to 20 samples portion totally amount to 3.5-4 Kg.
After prepration, the samples were analyzed. Base on the lithogeochemical data, several anomalies were identified in the Doust Beiglu area.
The first anomaly is located in the easternmost portion of study area that is the main zone of Au-Mo and relatively Cu and As anomaly.
The second anomaly is located in the middle portion of the area with Au, Cu and Mo anomalies.
The third zone is the southwesternmost portion of the area has Zn-Pb and Au anomalies.
The main lithology of the area is Eocene volcanics, extending the many parts of Iran from Azarbaijan to Kerman. In the area alterations are mostly epithermal from potassic to propylitic. Existing alteration hallows include sericitic, argillic, silicic, alunitic, and propylitic.