Integrated geophysical study of the Lakhshak gold-antimony deposit in the Sistan suture zone, southeastern Iran

The Lakhshak deposit is one of the most important gold-antimony deposits within the southwestern part of the Sistan suture zone in Sistan and Baluchistan province, northwest of Zahedan city, Iran. The deposit predominantly consists of Eocene quartz schist and calc-schist which were intruded by the O...

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Bibliographic Details
Published in:Arabian journal of geosciences 2022, Vol.15 (6), Article 492
Main Authors: Dehkordi, Nasim Heydarian, Niroomand, Shojaeddin, Tajeddin, Hossein Ali, Nozaem, Reza
Format: Article
Language:English
Subjects:
Anomalies
Antimony
Arsenopyrite
Carbonates
Chalcopyrite
Dikes
Ductile-brittle transition
Earth and Environmental Science
Earth science
Earth Sciences
Embankments
Eocene
Geophysical data
Geophysical exploration
Geophysical methods
Geophysical studies
Gold
Hydrothermal alteration
Induced polarization
Intrusion
Mineral assemblages
Mineralization
Oligocene
Original Paper
Pyrite
Pyrrhotite
Quartz
Schist
Schists
Shear zone
Silicification
Sphalerite
Stibnite
Sulfidation
Sulphides
Zincblende
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Summary:The Lakhshak deposit is one of the most important gold-antimony deposits within the southwestern part of the Sistan suture zone in Sistan and Baluchistan province, northwest of Zahedan city, Iran. The deposit predominantly consists of Eocene quartz schist and calc-schist which were intruded by the Oligocene mylonitic granitoid intrusion and dacitic/rhyolitic dikes. The mineralization occurred along the NE-SW trending ductile–brittle shear zone in the contact of calc-schist and granitoid intrusion which is hosted mostly in the calc-schist. The known hydrothermal alteration types in the Lakhshak district comprise sulfidation, silicification, carbonization, and sericitization. Ore mineral assemblages are simple and include pyrite, stibnite, chalcopyrite, arsenopyrite, pyrrhotite, sphalerite, electrum, and native gold. Pyrite is the most common sulfide mineral and is associated with gold mineralization in the study area. The present study discusses the effectiveness of integrated geophysical methods such as self-potential (SP), induced polarization (IP), and geological information in revealing the gold mineralization potential of the Lakhshak deposit. The results show the integrated geophysical data for the drilled cores gave a good positive correlation with the gold grade in the Lakhshak deposit. The positive anomalies on the SP and IP maps coincide with the sites of high-grade gold mineralization and intense sulfidation/silicification hydrothermal alterations in the internal parts of the shear zone as the concordant and discordant quartz (± carbonate) veins/veinlets. These geophysical methods have helped in the discovery of the new gold mineralization potential in the Lakhshak district.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-022-09628-9