1 1726-3689 Iranian Socity of Crystallography and Mineralogy 60 Special The use of mineral chemistry in the study of origin and evolution of dunitic rocks from Ab-Bid ultramafic complex (East Haji Abad, Hormozgan Province) 1 1 2017 24 4 621 634 08 04 2017 08 04 2017 Ab-Bid ultramafic complex is a part of Esfandagheh-HadjiAbad coloured mélange at the north of Hormozgan Province. It contains harzburgite, lherzolite, dunites, pyroxenite and chromitite. Dunites occur either as large and continuous masses or as dykes which have been intruded into the harzburgites. Mineral chemistry evidences show that the origin of these two types of dunites are completely different. Continuous dunites are similar to the residual mantle peridotites, while, dunitic dykes are the remnants of mantle channels and conducted the melts toward the upper levels. Dunitic dykes are produced by reaction of suprasubduction zone related  to boninitic melts with the harzburgites and they are replacive dunites, but the large and continuous dunites have formed by partial melting of the harzburgites in a suprasubduction zone setting and so they are residual dunites.
61 Special Mineralogy and Cu-Au-Bi ore paragenesis of Kuh-e Dom prospecting area (northeastern Ardestan), Anarak metallogenic province 1 1 2017 24 4 635 646 08 04 2017 08 04 2017 Modeling based on equilibrium thermodynamic and physicochemical condition suggests that Bi-rich melts can efficiently scavenge Au from hydrothermal fluids, even if these fluids are highly undersaturated with respect to Au minerals. At this study the Kuh-e Dom prospecting area in northeastern of Ardestan city (northern part of Anarak metallogenic province) as the prominent sample of Iron Oxide Cu-Au (IOCG) hyrothermal deposit have been investigated by quartz-hematite-sulfide mineralization accompanied with Fe-Cu-Au assemblage. The fahlor-group sulfosalt minerals, Bi-minerals and trace metals (e.g., gold, bismuth and electrum) investigated due to achievement of chemical composition and genetic relation to Au mineralization. Au scavenging occurs efficiently by Bi-minerals such as bismuthinite (B2.05S2.9), emplectite (Cu0.56Fe0.03Bi1.2S2.16), and native bismuth (Cu0.14Bi0.86). Evidence shows release electron from reduced minerals (e.g., pyrrhotite) and consequently increase of fluid oxygen have been eventuated Bi3+ to Bi0 and precipitation of bismuth. Hence, with occurrence of magnetite as the stable buffer phase the release electron involves reduction Au+ to Au0 and adsorbed by bismuth minerals.     62 Special Mineralogy and geochemistry of the Hizeh-Jan kaolin deposit, northwest of Varzaghan, East-Azarbaidjan Province, NW Iran 1 1 2017 24 4 647 660 08 04 2017 08 04 2017 The Hizeh-Jan kaolin deposit (NW Varzaghan, East-Azarbaidjan Province) is a typical clayey deposit with andesitic host of Eocene age in northwestern Iran. Based on XRD analyses, the minerals of this deposit include kaolinite, pyrophyllite, quartz, smectite, muscovite-illite, hematite, goethite, anatase, alunite, diaspore, feldspar, hornblende, and calcite. Increasing SiO2/Al2O3 ratio from the center toward outward in the studied profile indicate the presence of hydrothermal zoning in the deposit. Evidence such as the presence of silicic caps in the upper part of the deposit, local brecciation, mineralization of pyrophyllite, diaspore, and alunite, enrichment of LREEs relative to HREEs, pattern of mass changes of elements Al, Fe, Ti, Sr, and Nb, and positive correlations in trend of changes between (La/Lu)N, P, Sr, and S with LOI suggest that the development of the Hizeh-Jan kaolin deposit is affiliated to function of  hypogene processes on andesitic rocks. Geochemical analysis indicates that occurrence of negative Eu anomay (0.39-0.78) in kaolinized samples is in relation to destruction of feldspar and hornblende minerals of the andesitic rocks by hydrothermal fluids and occurrence of negative Ce anomaly (0.62-0.81) is due to the destruction of zircon by acidic-oxidizing fluids. 63 Special Investigation of mineralogy and geothermometry of quartz and tourmaline veins at the Baghu area, southeast of Damghan 1 1 2017 24 4 661 674 08 04 2017 08 04 2017 The Baghuo gold mine (Kuhzar) is located about 100 km S-SE of Damghan. The area is part of Torud- Chahshirin volcano- plutonic belt. The hosts of quartz – tourmaline veins are mainly granite, granodiorite and volcanic rocks such as andesite and dacite.  Mineralization occurs as a copper- gold bearing silica vein. Quartz, pyrite, chalcopyrite, gold, hematite, malachite, azurite, covellite and Fe- hydroxides ore are main constituents of mineralized veins. Gold grains with <50 µm in diameter commonly occurr within quartz grains. Based on petrography studies, six types of fluid inclusions in quartz were distinguished: (1) monophase liquid inclusions; (2) monophase vapor inclusions (3) two- phase inclusions of liquid-rich; (4) two- phase inclusions of vapor-rich; (5) three- phase halite-bearing inclusions; (6) poly-phase inclusions. Fluid inclusion studies show homogenization temperatures ranging from 250 to 400 °C with salinities from 4 to 30 wt% equivalent NaCl. Data shows that the evolution of mineralizing fluid occurred at a depth of more than 600 m below the surface and pressure about 100 bar. Evidences suggest that Baghu area mineralization may have occurred at the epithermal condition related to a porphyry system. 64 Special Mineralization and geochemistry of Dehzaman iron deposit (southwest of Bardaskan) and comparison with banded iron formation deposits 1 1 2017 24 4 675 690 08 04 2017 08 04 2017 Dehzaman iron deposit is located in southwest of Bardaskan, Khorasan Razavi Province. The area is situated in northeastern Posteh-Badam block based on structural map of Iran. In the deposit, hematite band with 1.5 km long, 6 meters thickness­ and east-west trending is located within Pre-Cambrian metamorphozed sedimentary rocks as conform. Field evidences such as consolidated hematite, present of hematite thin bands alternative with metamorphosed sedimentary units, lack­ of­ alteration, association­ of hematite with muscovite crystals, and present of exotic rocks and fragments show that this deposit is formed by percipitation of iron supergene in sea environment under sedimentary processes. In addition, geochemical  studies by elecrton micr. probe method on the hematite ore deposit and comparison of Ca, Al, Mn, Ti and V  elements, and major oxides between Dehzaman iron deposit and banded iron formation indicate that they are similar. Depletion of Si in Dehzaman iron samples, which is consistent with the field observations of the rare chert layers, can be related to iron percipitation within shore environment and away from source. 65 Special Investigation of particle size effect on structural and magnetic properties of La0.6 Sr0.4 MnO3 manganite 1 1 2017 24 4 691 702 08 04 2017 08 04 2017 In this work, La0.6Sr0.4MnO3 manganite particles with nano and micro scales were prepared by Sol-gel and solid state reaction methods. The results from X-ray diffraction analysis by Fullprof software showed that the samples have been crystallized in the rhombohedral structure with (R-3C) space group. Investigation of magnetic properties showed that this compound belong to soft ferromagnetic materials and Curie temperature of the samples shifted to lower temperatures with particle size reduction. Calculation of the effective magnetic moment using Curie-Weiss model showed the magnetic moment reduction of the samples with particle size decreasing. Using magnetization versus field, magnetic saturation reduction, due to particle size decreasing, was observed. The observed behavior described with Core-shell model and the thickness of magnetic dead layer was estimated. 66 Special Mineralogy and geochemistry of REEs in Anbagh alterd sketch, east of Ahar, NW Iran 1 1 2017 24 4 703 714 08 04 2017 08 04 2017 Anbagh altered sketch is located about 25 km east of Ahar, within Ahar-Jolfa metallogenic belt and laid by a widespread Eocene andesite to basalt volcanic rocks affected by Oligocene granite- granodiorite igneous bodies which altered them to silicic, argillic, phyllic and propylitic zones. The low pH and high acidity of SO4-2 ligands in fluid resulting in loses of REEs in silicic zone. Loss of LREEs in argillic zone caused by reduce in adsorption ability of clay minerals in low pH. The HREEs enrichment in phyllic zone is due to the abundance of sericite (±Fe oxides). A significant reduction of Eu/Eu* ratio in silicic zone can be attributed to the rare hydrothermal sulfides and clay minerals as an effective agents in sorption of released Eu+2. Decrease in pH caused by pyrite oxidation made negative Eu anomaly in argillic alteration zone. Factors such as changes in pH, the abundance of absorptive neomorph mineral phases, type and abundance of ligands play an important role in the distribution  concentration of REE in the play Anbagh alteration system 67 Special Mineral chemistry and thermobarometery of high temperature xenoliths in the contact of rhyodacitic rocks, Astaneh area (Southwest Arak) 1 1 2017 24 4 715 730 08 04 2017 08 04 2017 In Astaneh area (southwest Arak), in the contact with rhyodacitic subvolcanic rocks xenoliths with pyroxene- hornfels mineralogical composition have formed. These rocks have mineral paragenesis including corundum + spinel + andalusite + K-feldspar + plagioclase+ muscovite + biotite and chlorite with granoblastic, lpydoporphyroblastic, porphyrolpydoblastic, symplectite and poikiloblastic textures. In this complex, reaction texture (symplectite) of spinel + plagioclase+ muscovite, is replaced andalusite rim.  Petrography evidences show that the reaction texture of the andalusite rim has been created under conditions of partial melting. Geological and mineralogical evidence show that the pyrometamorphism process has been responsible as an indicator in this mineral complex. The field study, petrography evidence and thermobarometery (temperature 718 oC and pressure 2.8 kbar range) of these rocks show that the andalusite stability in the study xenolithe to the corundum-spinel zone is due to rapid incalescence rate of these rocks and overstepping. The heat diffusion from rhyodacitic subvolcanic is caused pyrimetamorphism process. So, the temperature period imposed and incalescence rate (geotherm gradient 60 oC/Km) on these xenoliths has been low and high, respectively. 68 Special Petrographic and geochemical evidences of restites (residual source material minerals) in the Gole- zard and Darreh-bagh granitoidic plutons (Aligoodarz, Lorestan Province) 1 1 2017 24 4 731 742 08 04 2017 08 04 2017 Aligoodarz granitoidic plutons (Gole -zard and Darreh -bagh) with Middle Jurassic ages are intruded into low grade regional metamorphic rocks (slate and phyllite) and caused aureole of low to medium grade metamorphic rocks (albite-epidote hornfelse facies). Based on precise field, petrographic and geochemistry investigations, the granites belong to the S- type and their composition range from granodiorite to granite and leucogranite. Calcic core of plagioclase (An91-84) with complicated zonation, andalusite xenocrysts, crushed garnet  with uniform composition Alm70Py22Gro4Sps4 in core, small biotite ± sillimanite assemblages and accessory minerals of zircon, monazite and apatite in granodiorite parts are the main residual minerals from partial melting of the source rocks and they considered as restite. This interpretation confirms with petrographic and geochemistry evidences in current study and it seems the separation of restite crystals from the primary melt and fractional crystallization have been effective differentiation process in granodiorite and felsic component, respectively. Mafic dykes are evidences of emplacement of mafic magmas related to subduction zone and played as an important role in melting of crustal rocks. 69 Special Mineralogy, geochemistry and origin of Baft northeast volcanic rocks (south Kerman): Evidence for volcanic arc magmatism in Uromieh-Dokhtar magmatic belt 1 1 2017 24 4 743 760 08 04 2017 08 04 2017 In north to northeast of Baft city, south Kerman, various outcrops of volcanic rocks, belong to Uromieh-Dokhtar magmatic belt, are observed. This region in Kerman Province situated in east of Dehaj – Sarduiye magmatic belt. Most of volcanic sequences in this area are andesite, andesite-basalt, dacite, and a few basalt and rhyolite with Eocene age that interlayered with pyroclastic and volcano sedimentary rocks with ignimbrites lavas. Study of rocks in this area and vocinity rocks showed that calco-alkaline series is dominant for these rocks. Major minerals include plagioclase, hornblende, biotite and pyroxene. Plagioclase phenocrysts in these rocks are shown inequilibrium texture such as zoning and sieves texture. From important textures in these volcanic rocks are porphyry, hyaloporphyry, microlitic and flowing. According to obtained results from analysis, these rocks showed enrichment from LREEs than to HREE. Also higher values of LILE than HFSE and negative anomaly in Ti, Nb and P in lavas revealed a subduction zone tectonic setting for this region and showed that primary magma are formed from mantle wedge melting in contact with derived oceanic crust flowing and enriched from LREEs originated. 70 Special Effect of milling time on the structure, particle size, and morphology of montmorillonite 1 1 2017 24 4 761 768 08 04 2017 08 04 2017 In the current research, effect of milling on the structure, particle size and morphology of montmorillonite was investigated. For this purpose, the montmorillonite was analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Then the montmorillonite was milled using high energy planetary ball mill at different milling times (1-60 hours). After that, the structure, particle size and morphology of all samples were investigated by XRD, FTIR, SEM, and transmission electron microscopy (TEM). Results showed that the ball milling causes the particle size reduction of clay and separation of the clay layers. Moreover, ball milling increases the overall structural disorder and transforms the crystalline structure into an amorphous phase. Also, the morphology of clay particle changes from layered to aggregates of almost rounded particles after 60 hours of milling. 71 Special Synthesis and single crystal X-ray diffraction of hybrid inorganic-organic based on Praseodymium-dipicolinic acid and nano-structured silicotungstate 1 1 2017 24 4 769 778 08 04 2017 08 04 2017 Hybrid inorganic-organic material based on Keggin type polyoxometalaes ([SiW12O40]4-) and praseodymium-dipicolinic acid (pydc; 2,6-pyridindicarboxylic acid) with the formula of [Pr2(pydc)2(H2O)8][H2SiW12O40]•4H2O (1) is obtained under a hydrothermal condition. Compound 1 was characterized by infrared spectrum and elemental analysis and its structure was further determined by single-crystal X-ray diffraction. X-ray analysis illustrates the praseodymium atoms connect to each other through organic linkers to form four nuclear cycles. Two crystallographically independent four nuclear cycles are created by a rotation C2 axis. Through connection of these cycles, another two cycles in different orientation will formed which are bigger by 8 nodes. Finally, silicotungstate molecules accommodate up and down these cycles. This motif will expand regularly in all dimensions to construct a 3D coordination polymer accompanied by Keggin nano-particle guests. 72 Special The Effect of calcination temperature on the structure properties of ZrO2 nanoparticles synthesized by modified sol gel ingelatin media 1 1 2017 24 4 779 788 08 04 2017 08 04 2017 In this research, ZrO2 nanoparticles were synthesized by modified sol-gelmethod at different calcination temperatures (600, 800, 1000, 1200 °C).  Zirconium (IV) oxynitrate hydrate as zirconium source, gelatin as polymerization and stabilizer agent and distilled water was used as the solvent. The crystal structures of the synthesized samples were characterized by X-ray diffraction (XRD) and the average crystallite size was estimated by Scherrer fomula and Williamson-Hall method. Transmission electron microscopy (TEM) images showed that the average particle size of zirconia calcined at 600 and 1200°C are 10 and 32 nm, respectively. FTIR analysis in the range of 400-4000 cm-1 was  carried out, the results of FTIR showed that the samples are calcined at 600 and 1200 °C have tetragonal and monoclinc structure, respectively. FT-IR spectroscopy analyses of the synthesized samples confirmed the XRD results.   73 Special Investigation of structural and electrical properties of Al2O3/PVP nano hybrid composite (as OFET dielectric gate) 1 1 2017 24 4 789 798 08 04 2017 08 04 2017 Al2O3/PVP nano-hybrid composite samples are synthesized using sol-gel method at 75°C. Weight percent of poly 4-vinyl phenol and aluminum oxide is 0.0, 0.28, 0.56, and 0.84. To study the nano-structural and electrical characteristics, X-ray diffraction, Fourier transfer infrared radiation, scanning electron microscopy, and atomic force microscopy are used. Dielectric constant of the samples is measured using “GPS 132 A” multi-meter. The results show that the highest amounts of dielectric constant at the frequency of 120 and 1 kHz are related to Al2O3 + 0.28 %wt. PVP(k=35) and Al2O3 + 0.56 %wt. PVP (k=26) nano-composite samples, respectively. Therefore, at the frequency of 120kHz, Al2O3 + 0.28 %wt. PVP nano-composite sample, due to having higher equivalent oxide thickness, less roughness, ohmicproperties, smaller size of nano-crystallites (Scherrer diameter of 45nm), higher dielectric constant, and as a result of less leakage current, is recommended as the gate dielectric for the future of organic field effect transistors. 74 Special Biotite chemistry and thermobarometry of barren and productive intrusive bodies in Dehaj-Meiduk area (North Shahrbabak) 1 1 2017 24 4 799 812 08 04 2017 08 04 2017 Studied rocks are located in Dehaj-Meiduk area north of Shahrbabak.There are eight porphyry intrusive bodies in this region including Meiduk, Parkam, Iejoo, Segino, Narkoh, Ayoub ansar, Sara and Keder that Meiduk, Parkam, Iejoo nad Segino are productive and Narkoh, Ayoub ansar and Sara are barren. The intrusive bodies are composed of quartzdiorite and granodiorite. The intrusive bodies are mainly composed of plagioclase, amphibole, biotite, Pyroxene, alkali-feldspar and quartz. Biotite is one of the most ferromagnesian mineral of these rocks. Compositionally, all biotites (barren and productive intrusive bodies) are situated between annite and siderophylite. Biotites in barren intrusive bodies are primary magmatic but biotites in productive intrusive bodies are primary, reequilibrated and altered. The study of oxidation and reduction state of their source magma by biotite chemistry indicates the crystallization in oxidation conditions and high oxygen fugacity. Therefore biotite rich intrusive bodies in Dehaj-Meiduk area complex are I-type or related to magnetite series and the estimated oxygen fugacity imply oxidation magma and its formation in convergent plate boundary. Emplacement or crystallization temperature for intrusive bodies in Dehaj-Meiduk area based on, Ti-in-Biotite thermometer, has been achieved between 548 to 574 ºc for productive intrusive bodies and 749 to 805 ºc for barren intrusive bodies. Also Al-barometer accounts that the pressure of biotites crystallization is 0.22 to 0.78K bar for productive intrusive bodies and 1.15 to 1.94 Kbar for barren intrusive bodies. The AlT content of biotite is 2.3 to 2.9 for productive intrusive bodies and higher than 3.3 for barren intrusive bodies. These data confirm that productive intrusive bodies has a good ability for copper mineralization based on Uchida et al. Method. Finally, the fluid related to productive intrusive bodies have log (fH2O / fHCl) higher than the fluid related to barren intrusive bodies. 75 Special Geochemistry and genesis of Robat-Paein barite deposit, Khomein, Markazi province 1 1 2017 24 4 813 824 08 04 2017 08 04 2017 The Robat-Paein barite deposit is located about 30 Km northwest of Khomein city, in the SanandajŲ€ Sirjan zone. The Lower Cretaceous carbonate sequences are the host rock of barite mineralization in the Robat-Paein­ deposit.­­ These carbonate sequences consist mainly of massive bedded orbitolina-bearing limestone (undergone dolomitization in some areas) as well as marl, shale and thinly bedded limestone. ­In this region, epigenetic mineralization occurred as vein, open space filling, fracture filling, massive and replacement textures in carbonate host rocks. The low ratios of Al2O3 (0.1-0.12 wt%), TiO2 (0.01-0.3 wt%), and a relatively high Sr concentration (average 3180 ppm) in the samples of Robat-Paein­ barite deposit could be a sign for presence of ­low temperature­ hydrothermal­ ore-bearing fluids. The enrichment of ­LREE/HREE indicate that­ chlorine-rich fluids were­ dominant during mineralization,­ compared to that­­ of ­fluorinated fluids.­­ According to transportation, LREE hydrothermal solution is made by complex chloride, because they are more soluble chlorides and can be deposited in the final stages.­­­­ The REE patterns of­ the­­ Robat­-Paein barite is analogous to continental margin low temperature hydrothermal barites of California SCCB­. The negative Ce anomalies (Ce/Ce*­= 0.26-0.91), strong positive Eu anomalies (Eu/Eu* between 1.83-3.06), high Ce/La ratios (Ce/La­=1.05), low Y/Ho ratios (Y/Ho between 4-7.14) are the indicative of deposition in continental setting­.­ ­­Based on the field observation, as well as mineralogical and geochemical studies, it seems that the Robat-­Paein deposit could be classified as a MVT deposit.