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Articles by M.H. Karimpour
Total Records ( 6 ) for M.H. Karimpour
  M.J. Abdollahi , M.H. Karimpour and A. Kheradmand
  Problem statement: The Muteh mining district is located in 70 km northeast of Golpaygan city within the Sanandaj-Sirjan metamorphic belt. There are 2 gold mines, 7 gold occurrences and numerous mineral indices in the Muteh gold district. There are few researches on Muteh gold district, but a detailed model is not clear yet. The aim of this study is to determine mineralogy of gold-bearing rocks and the role of these rocks in concentration of gold and to improve our knowledge about Muteh model. Approach: Detailed fieldwork carried out at different scales at the Muteh district. About 50 outcrops samples examined petrographically. Fifteen samples containing veinlets of sulfides and quartz selected for H, O and S stable isotope analysis. Petrography characterized by optical microscopy, Scanning Electron Microscopy (SEM) and X-Ray powder Diffraction (XRD) analysis. Results: Geological studies indicated that the study area show a major poly-phase metamorphism. Since the latest metamorphism was weaker than the earlier ones, the older rocks were affected by more intense metamorphism. The metamorphic rocks mainly consist of schists, quartzite, marble, amphibolite and gneisses. These rocks show two foliations (S1 and S2). The S2 foliation is the major phase in the metamorphic rocks. Pyrite is the most abundant and the important gold-bearing mineral at the study area. Based on evidences of deformation (S2) and crystallization, three main types of pyrites can be distinguished in the Muteh deposit: (1) pre-tectonic or gold bearing pyrite (2) syn-tectonic or disseminated pyrites along the foliation of the host rocks. (3) pyrite aggregates in the host rocks or in the metamorphic segregation quartz veins crosscutting the foliation of the host rocks. The sulfur isotope studies were carried out on pyrites within quartz veinlets, biotite schist and meta-volcanic rocks at the Muteh deposit. Five available data are highly variable even from the same types of hosted rocks and their δ34S are +2.2, 6.6, 9.1, 13.9 and 16.9‰. Conclusion: There are three generations of pyrite in Muteh gold district. According to isotope data, it seems that source of sulfurs were not homogenous. The values showed more than one geological event for generation of pyrites in the study area. Compositions of sulfur isotopes indicated several different sources or processes for the sulfide fluids. The sulfur of these pyrites might have derived either directly from regional metamorphism that produced the metamorphic fluid or through dissolution and leaching of pre-existing sulfide-bearing minerals.
  M.H. Karimpour , A. Malekzadeh Shafaroudi , C.R. Stern and M.R. Hidarian
  Enhanced Thematic Mapper Plus (ETM+) and airborne geophysics data have been used for locating porphyry copper and epithermal gold prospect areas related to hydrothermal alteration zones in the Lut block of eastern Iran. The Lut block has a great potential for different types of mineralization due to its extensive exposure of Cenozoic volcanic and subvolcanic calc-alkaline rocks generated in a subduction zone tectonic setting. Various ETM+ images processing techniques were employed, including false color composite images, color composite ratio images, standard PC image analysis on six bands and color composite selective PC images. Application of these techniques detected four major prospect areas and also identified another small previously unknown alteration area in the southeastern part of the district. Color composition selective PC images proved to be the most reliable method for exploration. Airborne magnetometry data show high magnetism over the most of the study area, resulting from the presence of magnetic-series granitoid rocks and/or propylitic/potassic alteration zones with magnetite veins related to mineralization. Low magnetic areas reflect intense magnetic destruction in other types of alteration zone. Radiometry detected areas of high K and U counts that have resulted from the presence of sericite, clay minerals and K-feldspar in alteration zones with low magnetism.
  E. Salati , M.R. Haidarian Shahri , M.H. Karimpour and M. Moradi
  The aim of this research was to use ground magnetic survey for exploration of new deposit in Taknar polymetal massive sulfide which is located in Northeast Iran in a tectonic corridor between two active faults. It is a syngenetic type mineralization formed at specific horizon within Taknar formation (Paleozoic?). Four mineralized zones named Tak 1, 2, 3 and 4 have been identified. Three style of mineralization such as layered, massive and stockwork have been recognized. Magnetite increases toward the massive part (up to 80 %), which is situated in the upper section. Magnetic susceptibility of the country rocks is 6x10-5 to 27x10-5SI, the stockwork mineralization is 4600x10-4SI, the layered is 7054x10-4 SI and massive is 1730x10-3SI. Due to this sharp magnetic contrast magnetic method found ideal and used for the identification of new deposit in Tak 1, 4 and outside of Tak 1 (to the east). Magnetic maps and images revealed distinctive anomalies on Tak 1, 4 and outside of Tak 1. The amplitude of the anomaly on Tak 1, 4 and outside of Tak 1 was 1500, 2227 and 1231 gamma respectively. The anomaly outside of Tak 1 is similar in magnitude to Tak 1 and does not have surface exposure. By analogy the source of all magnetic anomalies in Tak 1, 4 and outside of Tak 1 is magnetite present along with mineralization. Therefore the location of the anomaly outside of Tak 1 on the reduction to the pole map was proposed as drilling target.
  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.
  M.H. Karimpour and C.R. Stern
  Thirty scenes of Aster data from eastern Iran were processed using the Multispectral supervised classification method for identifying hydrothermal alteration zones related to possible mineral deposits. Several areas having great potential for mineral exploration were identified. ASTER mineral mapping from three known types of gold mineralization in eastern Iran were compared. Chah Shaljami, a high sulfidation Au (lithocap of porphyry Cu) prospect, shows alunite, silica, jarosite, dickite, montmorillonite and gypsum. Alteration is intense and covers an area of 3x4 km2. Aeromagnetic data show low magnetism within the area of alteration, indicating that magnetite was destroyed during alteration. Qaleh Zari is a specularite-rich Iron oxide Cu-Au deposit (IOCG). ASTER mineral mapping shows only epidote and chlorite. Alteration is narrow and is linear. Aeromagnetic data show high magnetism in most of the area, therefore alteration did not destroy the primary magnetite. Hired is a reduced-intrusion-related Au prospecting area. ASTER mineral mapping shows tourmaline, chlorite, silica and minor sericite. Alteration is local and is not as extensive as at Chah Shaljami. Aeromagnetic data show a very broad area of low magnetism that is associated with reduced ilmenite series intrusive rock.
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