Abstract
The probability of the occurrence of porphyry copper ore associated with subduction zone of the Neo-Tethys ocean and volcanic arc of Iran (Urumieh-Dokhtar) justifies the necessity of exploration and prospection of this type of ore in Iran. Zafarghand index and Kahang deposit of porphyry copper-molybdenum located in Isfahan province, center of Iran using Satellite data interpretations were discovered in the years of 2010 and 2003, respectively. Geological studies have indicated the presence of argillic and propylitic alteration halos associated with porphyry copper systems. The 250 rock samples were systematically collected at a sampling distance of 100 m and in the center of the porphyry system by a distance o f 50 m in Zafarghand. Also, 377 samples of lithogeochemicals (185 rock samples and 192 soil samples) were extracted systematically from Kahang deposit. The study of geochemical data of rock and soil samples showed similarity of these two types of mineralization with other mineralization of porphyry copper-molybdenum elsewhere in the world. Finally, the comparison of geochemical anomalies copper with rock units and alteration zones showed that atmospheric waters had washed out the copper in some of these zones and probably the supergene zone was formed in depth as porphyry copper-molybdenum deposit.
Highlights
IntroductionThe main rock units in the western deposit of Kahang porphyry copper are mainly andesite, andesite porphyry, dacite porphyry, quartz-monzonite, diorite and breccia andesite with quartz-magnetite veins and phyllic alterations (quartz-sericite), argillic (quartzclay Minerals), propylitic (epidote, chlorite) and all kinds of Fe-oxide (hematite) and Fe-hydroxides (Jarosite and goethite)
Porphyry copper-molybdenum deposits have been known for the first time in the early decade of the twentieth century in North America
Prior studies associated with geological aspects in Kahang deposite were conducted; for instances in (Afzal et al, 2012; 2010), they studied various mineralization zones especially supergene enrichment and hypogene zones in Kahang deposit, based on analyzing
Summary
The main rock units in the western deposit of Kahang porphyry copper are mainly andesite, andesite porphyry, dacite porphyry, quartz-monzonite, diorite and breccia andesite with quartz-magnetite veins and phyllic alterations (quartz-sericite), argillic (quartzclay Minerals), propylitic (epidote, chlorite) and all kinds of Fe-oxide (hematite) and Fe-hydroxides (Jarosite and goethite). The main rock units in the eastern part of Kahang deposit include andesite, andesitic breccia tuff (volcanic breccia), andesite porphyry, dacite Porphyry, quartz-monzonite, diorite, pebble dikes, along with quartz-magnetite veins and silica, phyllic, Argilic, propylitic alterations and Feoxide (hematite) and Fe-hydroxides (Jarosite and goethite) (Asadi Haroni, 2007) (Fig. 4). The converted data should be draw in probability plot and as can be seen from Fig. 8, the data are arranged by nearly straight lines, justifying the normal distributions of copper element in both Zafarghand index and Kahang deposit of porphyry copper-molybdenum
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