M.R Hosseinzadeh; S Maghfouri; M Ghorbani; M Moayyed
Abstract
The study area is located in Arasbaran metallogenic zone. Rocks of the Sonajil region include Eocene andesite lava, porphyry microdiorite, Incheh granitoid and Ozuzdaghi Plioquaternary volcanic rocks. Porphyry microdiorite is the main host rock of porphyry type Cu- Mo mineralization in the Sonajil deposit. ...
Read More
The study area is located in Arasbaran metallogenic zone. Rocks of the Sonajil region include Eocene andesite lava, porphyry microdiorite, Incheh granitoid and Ozuzdaghi Plioquaternary volcanic rocks. Porphyry microdiorite is the main host rock of porphyry type Cu- Mo mineralization in the Sonajil deposit. Much of the mineralization in the Sonajil deposit is dispersive and vein- veinlet type. Based on the structure, mineralogy and texture, the Sonajil vein- veinlets can be divided into sex different groups. These veins - veinlets contains sulfide (pyrite, chalcopyrite, molybdenite, bornite, galena, tetrahedrite, tenantite and enargite), hydroxide and oxide (magnetite and spicularite) and carbonate (malachite and azurite) minerals. Various types of fluid inclusions including mono-phase vapor, two-phase liquid and vapor, and multiphase liquid-vapor-solid of primary origin are present within quartz-sulfide veinlets.TH (L-V) for halite-bearing inclusions homogenizing by disappearance of halite and of vapor are 260-565˚C, 320-520˚C, respectively and salinity are 35.3- 69 % NaCl. TH (L-V) for two-phase inclusions homogenizing temperatures are 180-565˚C, and salinity are 0.7- 15.17 % NaCl. In bivariate plot of TH-salinity, two distinct populations of high and low salinity fluids are recognizable and most of the data points relating to the high salinity plot above the halite saturation curve. The coexistence of vapor-rich two-phase and halite-bearing inclusions having similar TH ranges can be indicative of boiling in the Sonajil porphyry deposit.
M.R Hosseinzadeh; S Maghfouri; M Moayyed; M Lotfehnia; B Hajalilou
Abstract
The studied area is located in Tarom metallogenic zone (NW of Iran). This area illustrate widespread hydrothermal alteration and disseminated and vein-veinlet type copper, lead and zinc mineralization.Injection of qm Intrusive body into Eocene volcano clastic complex (Karaj Formation) along linear Faults ...
Read More
The studied area is located in Tarom metallogenic zone (NW of Iran). This area illustrate widespread hydrothermal alteration and disseminated and vein-veinlet type copper, lead and zinc mineralization.Injection of qm Intrusive body into Eocene volcano clastic complex (Karaj Formation) along linear Faults caused intense hydrothermal alterations such as phyllic, argillic, propylitic and silicification. The major minerals of this rock are plagioclase, biotite, pyroxene, hornblende, alkali-feldespar, quartz with Lesser amount apatite, zircon, opaq minerals, rutile and sphene. Based on microscopic and geochemical assessments this rock is quartz- monzonite, tonalite, quartz- monzodiorite, and has calk-alkaline to shoshonitic and meta-aluminous character. This Pluton belongs to a volcanic arcs regime. The hydrothermal activities of penetrate intrusion causes the creation of two system vein and veinlet: ore bearing quartz vein- veinlet’s and non-ore bearing carbonate vein- veinlets. The mineralization in loubin- zardeh occured in quartz vein- veinlet along faults created via the intrusion of the intrusive. The main mineralizations of area are oxide (illmenite), sulfide (pyrite, Chalcopyrite, galena, sphalerite), sulfate (barite) and the supergene minerals are oxides and hydroxide, (hematite, goetite), sulfide (covelite), sulfate (anglesite) and carbonate (malachite and azourite). The most important characteristics of mineralization at the Lubin- Zardeh area such as tectonic setting, host rocks, mineralogy, metal content as well as wall rock alterations, and to compare these characteristics with the basic features of Epithermal deposits, the polymetal vein- veinlet mineralization in Lubin- Zardeh placed in the Epithermal category.
M Behyari; M Mohajjel; M Rezaeian; M Moayyed
Abstract
Misho Complex in NW Iran has a remarkable unique high topography surrounded by well known faults, where Precambrian basement rocks were uplifted and exposed. Structural data indicate that the exhumation of the Misho Complex was result of displacements along the North Misho, South Misho and Tasouj faults. ...
Read More
Misho Complex in NW Iran has a remarkable unique high topography surrounded by well known faults, where Precambrian basement rocks were uplifted and exposed. Structural data indicate that the exhumation of the Misho Complex was result of displacements along the North Misho, South Misho and Tasouj faults. Study of structural and thermochronometery and combination of their results show that uplift initiation time was not unique in this Complex. Analysis of 10 AFT samples clear that the western Misho Complex has the high amount of uplifting during early Palaeocene (72.7 10.6) mid Miocene (50.3-3.4) time. But uplifting in central and eastern parts of the Misho Complex was starting later in mid-Miocene (22.5 3.4). Difference in uplifting time in various parts of Misho Complex resulted in variety of basement uplifting and exhumation in different parts of the Misho Mountains. Interpretation of minimum and maximum topography homogenised samples shows that the rate of uplifting was more than that in the western part of the Misho Complex. It is concluded that, displacements variations along the surrounded faults and rotation of existing blocks resulted in variation of the uplifting and exhumation amount in the area.
M Roustaee; B Zamani; P Navabpour; M Moayyed
Abstract
Siah Cheshmeh- Khoy fault system is one of the principal faults in NW of Iran and that its right- lateral strike- slip activity has reported for different segments of this fault zone. Landsat 7 satellite images of the area, confirm the right- lateral strike- slip motion of this fault system by deflected ...
Read More
Siah Cheshmeh- Khoy fault system is one of the principal faults in NW of Iran and that its right- lateral strike- slip activity has reported for different segments of this fault zone. Landsat 7 satellite images of the area, confirm the right- lateral strike- slip motion of this fault system by deflected drainage of large rivers, cutting and displacement of alluvial fans across the segments of the fault zone. The amount of alluvial fans displacement in -Dasht e zurabad- (along the segment of the Kamarkassan fault) was estimated nearly 1.8 km. In this research, the neotectonics and mechanism of the Siah Cheshmeh- Khoy fault zone has been studied by Inversion method, based on the combination of focal mechanisms of earthquakes and different shear- fault planes. In this paper, we utilized all of the focal mechanism solutions of earthquakes existent in this area. Besides, the data measured conclude shear planes whit slickenside and the measured fault planes across the Siah Cheshmeh- Khoy fault zone. These data were gaged in 7 sites and 45 shear planes with slickenside. Initially the main axis were obtained in all sites by Inversion method; then by combination of focal mechanisms of earthquakes and the measured data, the stress state of this region was evaluated. The results obtained of this analysis indicate strike- slip stress with NNW-SSE (N162°) direction of compression component and ESE-WNW (N255°)direction of extension component in this area. It can be stated that the mentioned stress regime was the main factors controlling the recent kinematic movements of faults and strong earthquakes in the region. Also the right- lateral strike- slip motion of the Siah Cheshmeh- Khoy fault segments are affected by this stress (under the influence of this stress). The results of this research are compatible with the results of the geodetic studies and the GPS measurements in the region that were done by other researches.
R Ferdowsi; M Moayyed; A Kamali
Abstract
The Kalaibar nepheline syenitic body is located in East Azabaijan, NW of Iran. This alkalic body generally intruded semi-deeply into the Cretaceous and Eocene volcanic and sedimentary rocks. Based upon chemical classification, the composition of studied intrusive bodies are nephelines bearing syenite ...
Read More
The Kalaibar nepheline syenitic body is located in East Azabaijan, NW of Iran. This alkalic body generally intruded semi-deeply into the Cretaceous and Eocene volcanic and sedimentary rocks. Based upon chemical classification, the composition of studied intrusive bodies are nephelines bearing syenite (nepheline syenite), nepheline bearing gabbro (alkalic gabbro), syenite and quartz monzonite (syeno-diorite) in order of abundance. In addition, the composition of accompanying dyke and pegmatitic units are nepheline syenite, syenodiorite and gabbro. Common textures of studied rocks are prophyritic granular and granular and accompanying dykes have fine grained granular, porphyritic and coarse grained granular textures. According to mineralographic studies and XRD analysis results, the main mineral phases contain orthoclase, albite, nepheline, oligoclase, hornblend, augite and Melanite. The nature of parent magma of these intrusives is potassium rich alkaline, metaluminous and miaskitic. Petrographical and geochemical studies based upon accessory and rare elements illustrate that these intrusives formed in a subduction or post collision related tectonic setting, which their lithological variety is justifiable by fractionation crystallization. The studied intrusives show the enrichment of Zn, Ba, Sr, Th and Pb and enrichment of Co, Sr, Pb and V in accompanying dykes. LREEs relative to HREEs show enrichment. Comparison of studied body with some other ones of corresponding type of the world in terms of the amount of accessory and rare elements shows that the Kalaibar nepheline syenitic body is resemble to the central Anatoly (Turkey), Zijinshan (china) and Musale (India) bodies.
M.R Hosseinzadeh; M Moayyed; S Maghfouri; S Alipour; B Hajalilou
Abstract
The study area is located in Arasbaran Metallogenic Zone. The rocks of the Baloojeh region includes of Oligo-Miocene quartz-diorite porphyry, gabbro-diorite, quartz-monzonite and granodiorite. The quartz diorite is the main host rock of porphyry type Cu-Mo mineralization in the Baloojeh deposit, but ...
Read More
The study area is located in Arasbaran Metallogenic Zone. The rocks of the Baloojeh region includes of Oligo-Miocene quartz-diorite porphyry, gabbro-diorite, quartz-monzonite and granodiorite. The quartz diorite is the main host rock of porphyry type Cu-Mo mineralization in the Baloojeh deposit, but also in the other intrusive porphyries, copper mineralization can be seen. Much of the mineralization in the Baloojeh deposit is dispersive and vein- veinlet type. Based on the structure, mineralogy and texture, the Baloojeh vein- veinlets can be divided into four different groups. These veins - veinlets contains sulfide (pyrite, molybdenite, chalcopyrite, boehrnite, galena, and sphalerite), hydroxide and oxide (magnetite, hematite and goethite) and carbonate (malachite and azurite) minerals. Similar to other Cu- Mo porphyry deposits, the Baloojeh deposit contains of potassic, phyllic, argillic and propylitic alterations. The parent magma of intrusives has calk-alkaline to shoshonitic character that implaced in a post-collisional magmatic arc. The fluid inclusion study has been done on the different groups of veinlets. These studies suggest high temperature (221- 381 C°) and high salinity (5- 45 % NaCl) hydrothermal fluid and the occurrence of boiling phenomena in the ore- forming hydrothermal fluids of the Bloojeh deposit.
A Nouri Mokhoori; B Zamani; M Moayyed
Abstract
Tabriz Fault is one of the major faults of Iran that is situated in the northwest of Iran and central part of the Iranian Azerbaijan. The fault has a well-known paleoseismological history, and being situated adjacent to the Tabriz city with two millions ofinhabitants makes ita big seismic hazard. In ...
Read More
Tabriz Fault is one of the major faults of Iran that is situated in the northwest of Iran and central part of the Iranian Azerbaijan. The fault has a well-known paleoseismological history, and being situated adjacent to the Tabriz city with two millions ofinhabitants makes ita big seismic hazard. In this research,a study of instrumental seismic data, remote sensing and field observationsalong the Tabriz Fault Zone from north of Miyaneh to the west of Marand cities helped us to define three main segments along the fault. Fault Movement Potential (FMP) has a close relationship with tectonic stress in and around a given fault zone. Therefore, the stress state was analyzed using direct inversion method to estimate potential movement of each segment of the Tabriz Fault. Results showedthat the middle and southern segments of the Tabriz Fault have a FMP of 0.67-0.73,implying their high potential of reactivation and generating large and destructive earthquakes, assupported bythe richseismic history of these segments. Therefore the results of this research estimatea 70% movement probability for the North Tabriz Fault. In contrast, the northern segment of the Tabriz Fault (western part of the fault close to the Marand city)showsa FMF of 0.3-0.37,indicatingits lower potential of reactivation compared to the middle and southern segments. This is also in agreement with the poor seismic history of the northern segment.
