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Articles by A. Malekzadeh Shafaroudi
Total Records ( 2 ) for A. Malekzadeh Shafaroudi
  M.H. Karimpour , C.R. Stern , A. Malekzadeh Shafaroudi , M.R. Hidarian and A. Mazaheri
  Doing research, two suites of Oligocene-Miocene granitoids, one relatively oxidized (magnetite-series) and the other relatively reduced (ilmenite-series), were identified at Hired, Eastern Iran. Since Au-Sn mineralization is associated only with the relatively reduced ilmenite-series suite. It became interested to study the petrochemistry and petrophysics of these intrusive rocks. The magnetic susceptibility of the magnetite-series granitoids is greater than 300 x10-5 SI. This suite includes meta-aluminous, medium-K to high-K series gabbros to diorites containing magnetite, hornblende and biotite. The magnetic susceptibility of the ilmenite-series granitoids are less than 60 x10-5 SI. This suite includes meta-aluminous, high-K to shoshonitic diorites to granites, containing, biotite, muscovite and tourmaline. Both the ilmenite and magnetite series suites are strongly enriched in large ion lithophile elements (LILEs = K, Th, Rb, Ba) and depleted in high field strength elements (HFSE = Nb, Sr, Ti, Hf). Chondrite-normalized Rare Earth Element (REE) plots indicate strong enrichments of light relative to heavy REE, with (La/Yb)N between 7-24. Ilmenite suite granitoids have pronounced negative europium anomalies. Stockwork mineralization is found within and nearby the relatively reduced ilmenite-series granites. Based on their mineral assemblages (arsenopyrite, pyrrhotite, tourmaline, pyrite, gold and quartz), the ore-bearing fluids that generated these stockwork veins was also reduced. This and the spatial relationship of mineralization with the ilmenite suite granitoids, indicates that the ore fluids originated from reduced granitoid magmas. Hired Au-Sn deposit is a reduced-intrusion related gold system.
  A. Malekzadeh Shafaroudi , M.H. Karimpour , C.R. Stern and S.A. Mazaheri
  Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) image processing have been used for mapping hydrothermal alteration in Eastern Iran. Eastern Iran has a great potential for the discovery of different types of mineralization. This technique works very well in eastern Iran due to low precipitation causing very minor soil development and the small amount vegetation and therefore good rock exposure. ASTER images processing can identify areas with hydrothermal alteration for further exploration. Application of ASTER false color composite images, color composite ratio images, principal component analysis and Spectral Angle Mapper (SAM) techniques detected five altered areas in the district of SW Birjand, Eastern Iran. Spectral Angle Mapper (SAM) classification proved to be the best method for mineral mapping. This technique shows very good results for identification of different type of alteration with distinct mineral assemblages. The SAM method has also detected argillic and alunitization zones in areas that had not been clearly recognized by earlier techniques.
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