Economic Geology
Ali reza zarasvandi; Mohammad Ali Ali Abadi; Mohsen Rezaei; Houshang Pourkaseb
Abstract
The Mohammadabad deposit is located in vicinity of Delijan in central province and in terms of structural zones of Iran,in the Uremia dokhtar zone. Stratabound Fe-Ce mineralization in brecciated, vein, massive, layered and laminar forms, consists ore minerals such as hematite, pyrite, chalcopyrite and ...
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The Mohammadabad deposit is located in vicinity of Delijan in central province and in terms of structural zones of Iran,in the Uremia dokhtar zone. Stratabound Fe-Ce mineralization in brecciated, vein, massive, layered and laminar forms, consists ore minerals such as hematite, pyrite, chalcopyrite and magnetite ,is seen in lower Eocene volcano sedimentary unites. Amounts , ratios and diagrams of trace elements and rare earth elements show hydrothermal mineralization with the predominance of magmatic fluids. The values of δ34SCDT of sulfide minerals (-2.76 to1.51 ‰) and suggest the magmatic source for sulfur or mineralizing fluid with magmatic sulfur. The values of δ13C (mean 3.61 ‰), δ18O(mean12.946‰) related diagrams show a magmatic source for carbon, hydrothermal genesis for calcite and a mineralizing fluid dominantly magmatic source. above evidences,وthe location of the region in tensile tectonic regime in western edge position of uremia dokhtar magmatic arc during the Eocene and presence of magmatic mass in the depths of the region with high potential for iron and copper mineralization , sulfur supply ,also has played role of a heat engine to circulating and transfer of mineralizing fluids to the sea bed. Offers exhalative-hydrothermal processes model for deposit genesis in Eocene volcano sedimentary units
Economic Geology
A. R. Zarasvandi; Fatemeh Davoodian Ranjbar; Mohsen Rezaei; M. Tashi; Houshang Pourkaseb
Abstract
Sarkuh porphyry copper deposit is located 180 km west of Kerman province, 6 km southwest of Sarcheshmeh porphyry copper mine in the northeast of Pariz city. Considering geological divisions, it is a part of Urumieh-Dokhtar magmatic arc. The exposed rocks in this area are mainly composed of volcanic units, ...
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Sarkuh porphyry copper deposit is located 180 km west of Kerman province, 6 km southwest of Sarcheshmeh porphyry copper mine in the northeast of Pariz city. Considering geological divisions, it is a part of Urumieh-Dokhtar magmatic arc. The exposed rocks in this area are mainly composed of volcanic units, tuffs, andesite and basaltic andesite. Also intrusive units include granite to granodiorite, and to a lesser extend quartz diorite rocks. Major alterations of the deposit include potassic, phyllic, argillic and propylitic, as well as intermediate alterations such as potassic - argillic and potassic - phyllic. The purpose of this research is to study the chemical features of biotite and chlorite in order to investigate the physicochemical attributes of porphyry system during magmatic to hydrothermal transition in the patassic alteration. Based on the temperatures of reequilibrated biotite, at the time of magmatic to hydrothermal transition, the temperature ranged from 343 to 397°C. Also high magnesium nature of biotites, and their plotting in the boundary of magnetite-hematite (HM) and nickel-nickel oxide (NNO) buffering lines, as well as presence of magnetite with hematite rims indicate previlling of the high oxygen fugacity during potassic alteration.
R. Roshanak; A. R. Zarasvandi; H. Pourkaseb; F. Moore
Abstract
Main Travertines of Iran are located in a NW-SE trending belt (Urmia-Dokhtar Belt), extending from Tabriz to Zahedan. Neo-tectonic activities (Plecene to now) with travertine deposits around hot springs and volcanic features can be seen along this belt. In this study, East Azerbaijan travertines (northern ...
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Main Travertines of Iran are located in a NW-SE trending belt (Urmia-Dokhtar Belt), extending from Tabriz to Zahedan. Neo-tectonic activities (Plecene to now) with travertine deposits around hot springs and volcanic features can be seen along this belt. In this study, East Azerbaijan travertines (northern of Urmia-Dokhtar structural zone) is investigated and are compared with Kurdistan and West Azerbaijan travertine (northern of Sanandaj-Sirjan structural zone). The studied samples classify in thermogene category, using geochemical, mineralogical and 18O and 13C isotopes studies. Based on facies studies, northern Urmia-Dokhtar travertines fall in oncoid crystalline while Sanandaj-Sirjan travertines show oncoid, crystalline crust and pebbly facies. Using the measured δ13C values of travertine gives the δ13C of the CO2 released from the water during travertine deposition. Source of the CO2 in the water springs was crustal magmatic water. The stable isotope composition of two areas were compared with Turkey travertines and they show similar genesis, CO2 source and isotopic composition.
