Economic Geology, Petrology and Environmental of Copper Ore Deposits of Chagho in South West Karaj

Autores

  • Alireza Rakhshani Moghadam Alrakhshni67@yahoo.com
    PhD student in Economic Geology, Department of Geology, Faculty of Basic Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran http://orcid.org/0000-0003-4906-7954
  • Mohammad Lotfi m_Ltfi_10140@yahoo.com
    Associate Professor, Department of Geology, Faculty of Basic Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran
  • Mohammad Reza Jafari jafarimohammed92@yahoo.com
    Assistant Professor, Department of Geology, Faculty of Basic Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran
  • Afshin Ashja Ardalan afshinashjaardalan@yahoo.com
    Assistant Professor, Department of Geology, Faculty of Basic Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran
  • Majid Pour Moghaddam drmajidp@yahoo.com
  • Abdollah Yazdi yazdi_mt@yahoo.com
    Assistant Professor, Department of Geology, Kahnooj Branch, Islamic Azad University, Kahnooj, Iran

Palavras-chave:

Geologia econômica, petrologia, geologia ambiental, depósito de cobre

Resumo

The mineral zone under study is 32 square kilometers located in Chagho village, Akhtarabad village, Malard county, Shahriar city, Tehran province. This area is part of the Urumieh-Dokhtar Volcanic Belt. The age of the studied rocks is related to the Eocene and younger than the Eocene. The downward trend of some oxides of major elements such as MgO, CaO and AL2O3 and the increasing trend of K2O and Na2O over SiO2 from the basaltic rocks to the intermediate-acidic rocks in rocks of the studied area are consistent with the magmatic subduction process. Based on standardized radar charts relative to chondrite of the rocks under study, enrichment of elements (LILE) such as Cs, Rb, Ba and light rare earth elements (LREE) relative to HFS elements (Ti, Nb) and heavy rare earth elements (HREE) (Y, Yb, Lu) is shown. In all of the rocks mentioned above, the element u is enriched relative to the primary mantle. The positive anomaly of this element may indicate contamination of their constituent melts with the upper crust. In all studied rocks, HFS elements such as Ti, Nb show depletion and concave pattern. The depletion of the aforementioned elements to the primary mantle may be attributed to the contamination of the melts with lower and upper crustal or possibly the dependence of the melts constituting these rocks on the geodynamic environments of subduction of Neo-Tethyan. According to the study of fluids involved in the region, the temperature of homogenization with the temperature of formation of copper veins is between 120 and 306 ° C, and the salinity percentage varies from 6.45 to 15.96 wt% of sodium chloride. Accordingly, this ore deposit is classified as mesothermal and is a type of hydrothermal allogenic deposits, the presence of sub-faults and seams and gaps in the host rock as a low-pressure environment has provided a suitable site for vein-type mineralization

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2021-06-25

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Moghadam , A. R. ., Lotfi, M., Jafari, M. R. ., Ardalan , A. A., Pour Moghaddam, M., & Yazdi , A. (2021). Economic Geology, Petrology and Environmental of Copper Ore Deposits of Chagho in South West Karaj. Revista Geoaraguaia, 11(1), 7–26. Recuperado de https://periodicoscientificos.ufmt.br/ojs/index.php/geo/article/view/12475

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