TN1003 : Exploration of Polymextal ore deposit in east of Iran using Geological and Geophysical data
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2020
Authors:
Hadi Abdolahpour Darvishan [Author], Ali Reza Arab-Amiri[Supervisor], Susan Ebrahimi[Supervisor]
Abstarct: Geophysical surveys are an important tool for identifying and separating rocks, determining the depth and extent of mineralization. Using several geophysical methods together and combining them with basic information such as geology increases the possibility of exploration and access to mineralization potential areas. Copper, lead and zinc mineralization is located in the structural zone of Lut block in eastern Iran. The rock is the host mineralization sequence of fused pyroclastic and Eocene volcanic units located near Tertiary intrusions. The presence of hydrothermal fluids associated with intrusive masses (probably) has caused extensive alteration of quartz carbonate sericite and local alteration of iron and silica in the area. Mineralization in the form of siliceous veins (3 zones) with northeast-southwest trend that has followed the trend of faults and fractures in the region and includes pyrite, chalcopyrite, malachite, chrysocla, galena and sphalerite. Geological studies show that the mineralization is of the type of hydrothermal vein polymextals. To achieve accurate results of exploratory studies in the region, a combination of magnetometric, resistivity and IP methods with geological data were used. A total of 852 stations were performed for magnetometric surveys with a network of 10 x 50 meters in the desired range. The results of this survey revealed the geological structure and the trend and extension of faults corresponding to the two mineralization zones. A total of 424 stations for specific strength and IP data collection were performed using a bipolar array along six profiles (5 east-west profiles and 1 north-south profile) at 50 m and 25 m electrode distances and 50 m and 100 m profile distances from each other. The data obtained from the mentioned profiles were processed and modeled using RES2DINV and ZondRes2D software after initial corrections by two-dimensional smooth inversion method. This data set was used in order to better represent the anomalous areas and the relationship between geophysical sections and also to determine the drilling points in the study area more accurately, three-dimensional inverse modeling using RES3DINV software. Voxler software is used to better display the results of 3D modeling. The results of specific strength and IP studies have shown the faults of the region as well as mineralization areas. Specific strength and IP models are the abnormal areas associated with mineralization in the region, with moderate to high load values and moderate values of specific strength, mainly related to fault structures and fractures. Accordingly, an anomaly in the center of the area with a northeast-southwest direction in relation to fractures of pyroclastic volcanic rocks and conforming to zone 1 (main) in the area and an anomaly in the southeastern part of the region in connection with fracture volcanic host rock fractures with Almost parallel lines with the previous anomaly were identified as northeast southwest and corresponding to zone 2 in the region. Finally, baxsed on the results, 7 points for drilling were suggested.
Keywords:
#Polymextallic mineralization #magnetometry #resistivity #inductive polarization (IP) #Dipole- dipole array Keeping place: Central Library of Shahrood University
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