Mineralogy, geochemistry and origin of Zafarabad iron deposit based on REE and trace elements of magnetite

زمین شناسی اقتصادی

Article 4, Volume 5, Issue 2 - Serial Number 9, January 2014, Pages 235-254   

Document Type: Research Article

DOI: 10.22067/econg.v5i2.31799

Authors

Mehrdad Barati^* ; Maysam Gholipoor

Bu-Ali Sina

Abstract

Zafarabad iron deposit is located northwest of Divandareh, in the northern margin of Sanandaj-Sirjan plutonic-metamorphic zone. The deposit is in lentoid to tubular shape, within a shear zone and occrrued in host rocks of calc-schist and limestone. Magnetite with massive, cataclastic and replacement textures are the main phases, while pyrite and other sulfide minerals are found. Major and trace elements are measured by ICP-MS and ICP-AES methods. Based on some ratios of trace elements in the ore samples and (Ti+V vs. Cal+Al+Mn and Ti+V vs. Ni/(Cr+Mn)) diagrams which are used for classification of iron deposit types, Zafarabad iron deposit fall in the range of skarn deposits. Spider diagrams show a steady decline from LREE to HREE elements with Eu (mean value of 0.06 ppm) and Ce (mean value of 0.94 ppm) negative anomalies. Comparing the distribution patterns of REE for the Zafarabad magnetites with those of various types of iron deposits shows that the REE pattern for Zafarabad is similar to these deposits. Analysis of calculated parameters for REE shows that the hydrothermal fluids responsible for mineralization are mainly of magmatic origin through fractionation and crystallization processes of a deep iron rich fluid phase and its emplacement within the carbonate rocks, forming iron skarn.

Keywords

Zafarabad; Shear zone; magnetite; REE; Magmatic waters; skarn

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