Petrography, Geochemistry and Mineralization of Pb in Hezarabad Area (Ashtian)

Subject Areas :

Alireza Haddadpour ¹ (دانشجوی کارشناسی ارشد زمین شناسی اقتصادی،دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران)
Raziyeh Mohammadi ² (استادیار، گروه زمین شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی، واحد آشتیان)
Haddi Golzar ³ (کارشناس ارشد، شرکت مجتمع نگین معادن احیاء سپاهان، اصفهان، ایران)

Received: 2016-09-07 Accepted : 2016-09-07 Published : 2012-09-22

Keywords: Mineralization, Central Iran, Geochemistry, Pb-Zn, Ashtian,

Abstract :

Hezarabad area is located 5 km at south east of Ashtian, Markazi Province. Structurally, the area is located in theUrmia-Dokhtar magmatic belt of Iran. The basement rocks of the area are pelagic limestone, lithic tuffs, andlimestone to sandy limestone, marl, conglomerate, andesite lava and shale. Andesitic and tuff are the main hostrock of mineralization. The mineralization mostly is vein types in four trends which follow NE-SW trend oflocal faults. The mineralization can be seen also as disseminated, breccia to fills fractures and pore-spaces types.The most important ore minerals are galena, cerosite and sphalerite. The galena is associated mostly barite inlocal faults. The second important mineral is sphalerite which can be seen mostly in tunnels. 40 samples wereanalyzed by Inductive Coupled Plasma Mass Spectrometry (ICP-MS) for Pb, Zn, Ag, As, Cd, Co, Cr, Cu, Mo,Ni. The data processing indicates high anomaly for Zn and Pb and relatively anomaly for Cu, Ag, As, Mo. Theaverage value of Pb is 34525 ppm and average value of Zn is 6108 ppm. The Mo content is reach up to 1182ppm. According to correlation diagrams, there is a high correlation between Pb and Ag and also Ag and As. Itshows that the galena is the main host of these elements.