Aspects of magmatic–hydrothermal evolution of Kahang porphyry copper deposit, Central Iran

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• 作者：Mehdi Azadi ; Mirsaleh Mirmohammadi ; Ardeshir Hezarkhani
• 关键词：Porphyry ; Petrology ; Fluid inclusion ; Kahang ; Central Iran
• 刊名：Arabian Journal of Geosciences
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：8
• 期：7
• 页码：4873-4893
• 全文大小：4,899 KB
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• 作者单位：Mehdi Azadi (1)
  Mirsaleh Mirmohammadi (1)
  Ardeshir Hezarkhani (2)
  
  1. Department of Mining Engineering, Faculty of Engineering, University of Tehran, POB 11155-4563, Tehran, Iran
  2. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

Kahang porphyry copper deposit in Isfahan Province, Iran, is located in the middle of Urmia-Dokhtar Magmatic Arc. Petrographic studies revealed that igneous rocks in the eastern part of the deposit are divided into three types: host rocks, mineralizing stocks, and post-mineralization barren dikes. Host rocks are mainly Paleocene-Eocene aged, ranging in composition from andesite through quartz-andesite to trachyte-andesite and tuff. Oligo-Miocene quartz-diorite–granodiorite and late dacite have intruded into these volcanic rocks, and are cut by barren andesitic and dacitic dikes. Quartz-diorite has composed more than 70?% of the main mineralizing stock, followed by dacite and less commonly by granodiorite. Geochemistry of plutonic and volcanic rocks confirms that these rocks were crystallized from a single calk-alkaline magma through the differentiation process. Intensive hydrothermal alteration in the deposit is characterized by outward zoning from potassic (biotitic), overprinted by phyllic, quartz-sericitic, to propylitic (chloritic-calcitic), and argillic (jarositic) alteration. Potassic alteration in depths less than 730?m is mainly biotitic, and has no K-feldspar. But, in deeper depths, K-feldspar, quartz, and biotite form the typical potassic alteration zone. The most extensive alteration type in the deposit is phyllic that has mainly affected mineralizing dacitic rocks. Six main groups of veins and breccias were identified related to alteration processes. These groups, from oldest to youngest types, are: Bt-M-, A-, B-, P-, D-T-, and L-type veins and breccias. Fluid inclusion studies on mineralized quartz veins in potassic zone show that mineralization has occurred in a minimum temperature, pressure, and depth of 415?°C, 340?bars, and 1.3?km, respectively.