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. ...
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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.
S Maghfouri; M.R Hosseinzadeh; R Rajabi; A.M Azimzadeh
Abstract
The early Cretaceous sedimentary sequence in south of Yazd hosts numerous Zn-Pb-Ba mineralization horizons. The sequence based on the stratigraphic position, age and composition of the rocks, can be divided into tree lower, middle and upper parts. The lower part or Sangestan formation mainly formed from ...
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The early Cretaceous sedimentary sequence in south of Yazd hosts numerous Zn-Pb-Ba mineralization horizons. The sequence based on the stratigraphic position, age and composition of the rocks, can be divided into tree lower, middle and upper parts. The lower part or Sangestan formation mainly formed from clastic sedimentary rocks such as conglomerate, sandstone, shale, siltstone and oolitic limestone. The thick Sangestan sedimentary sequence is well exposed resting unconformably on the Jurassic Shir-Kuh granite and metamorphic Shemshak Group. The middle part or the Taft formation include organic matter-rich shale, siltstone, limestone and dolomite. The upper part or the Abkuh (Darreh-Zanjir) formation comprised of shale, chert-bearing bedded limestone and marls, overlying concordantly on the Taft formation. The Zn-Pb-Ba mineralization horizons within the sedimentary sequence, based on stratigraphic position, relative age and type of host rocks involved the two horizons: the first horizon consisting of Mehdiabad, Farahabad and Mansourabad deposits, occurred in the lower part of the Taft formation and hosted by organic matter-rich shale, shaly limestone, siltstone, silty limestone and dolomite. The second horizon comprising Mehdiabad and Mansourabad deposits are hosted by black shale and chert-bearing bedded limestone locates within the middle part of the Abkuh formation.
M.R Hosseinzadeh; S Maghfouri; M Moayyed; A Rahmani
Abstract
The Khalifehlu Cu-Au deposit is located ~7 km North of Khoramdareh, in the central part of the Tarom magmatic zone. Rock units exposed in the area consist of volcanic, subvolcanic and intrusive rocks, which are associated with Eocene tectonics and Magmatism. Volcanism started with large-scale ...
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The Khalifehlu Cu-Au deposit is located ~7 km North of Khoramdareh, in the central part of the Tarom magmatic zone. Rock units exposed in the area consist of volcanic, subvolcanic and intrusive rocks, which are associated with Eocene tectonics and Magmatism. Volcanism started with large-scale andesitic-trachyandesitic lavas and pyroclastics; continued by rhyolite domes, and culminated by a quartzmonzonite porphyry. Copper-gold mineralization at the Khalifehlu is intimately associated with the breccias and veins. The highest grade and most extensive mineralization occurs in silicic veins. Two stages of mineralization are identified at the Khalifehlu area that progressed from regional breccia (phase 1 from stage 1) to Au- bearing silicic- sulfide vein- veinlet (phase 2 from stage 1) to oxide-dominant breccias (phase 1 from stage 2) to specularite vein- veinlet (phase 2 from stage 2). Gold occurs with sulfide minerals as disseminations, as well as in the veins and breccia cemented during phase 2 from stage 1. The wall–rock alteration in the Khalifehlu deposit exhibits a clear concentric zoning pattern. The vuggy quartz and argillic alteration are spatially and closely associated with high-grade gold mineralization, and are mainly developed along veins and in breccias. Propylitic alteration is widespread around the ore bodies. Pyrite, chalcopyrite, bornite, covollite, chalcocite, hematite and native gold are present in the ores. The ore minerals show disseminated, vein-veinlet, replacement, fibrous and breccia textures. We suggest near-surface emplacement of volatile-rich quartzmonzonite porphyry, followed by extensive brecciation and hydrothermal alteration-mineralization. The geology, alteration, and mineralization in the Khalifehlu deposit is similar to high-sulfidation type epithermal deposits.
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 ...
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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.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 ...
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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.
S Maghfouri; E Rastad; F Mousivand
S Maghfouri; E Rastad; F Mousivand; Y Lin
Abstract
Copper mineralization in Nudeh Cu deposit and Frezy, Garab, Kalateh lala (Nieran) and Chun occurrences, located in southwest of Sabzevar hosted by a Upper Cretaceous volcano-sedimentary sequence formed in a rift environment. The main is host rock of the Nudeh Cu sulfide deposit includes alkali olivine ...
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Copper mineralization in Nudeh Cu deposit and Frezy, Garab, Kalateh lala (Nieran) and Chun occurrences, located in southwest of Sabzevar hosted by a Upper Cretaceous volcano-sedimentary sequence formed in a rift environment. The main is host rock of the Nudeh Cu sulfide deposit includes alkali olivine basalt flow and subordinate tuffaceous silty sandstone. Host rock of the Ferizy and Garab occurrences is andesite flow. The rock forming mineral of Kalateh lala (Nieran) and Chun occurrences is tuffaceous silty sandstone. Sulfide mineralization in the Nudeh deposit and occurrences within an Upper Cretaceous volcano-sedimentary sequence occurs as sheet-like &tabular shape within three ore horizons. Based on nature of sulfide mineralization, mineralogy and textures of sulfide minerals, the Nudeh deposit can be divided into three different ore facies. Based on their situation towards the vent of mineralizing fluid, these facies include: A) Vein-veinlets facies (Stringer zone) includes sulfide veins and silica that form as a scissors of host rocks under the massive ore facies. Vein-veinlets and replacement textures formed main features of this facies. B) Massive ore facies that forms the thicker part of generally massive higher grade ores in west of the deposit and includes sulfide mineralization with heterogeneous nature and stratabound, limited in the alkali olivine basalt flow. C) Bedded ore facies which is thinner than the massive ore facies and is characterized by layered and banded apparent and low grade ore. The rock forming mineral of this facies is tuffaceous silty sandstone. This facies occurs as laminated and banded sulfides contemporaneous with the host rocks layering at eastern part of the deposit. Mineralogy of Nudeh deposit includes chalcopyrite, pyrite, bornite, sphalerite, boulangerite and magnetite wall rock alterations are dominated by silicification, chloritization, sericitization and epidotization. The most important characteristics of mineralization at the Nudeh deposit such as tectonic setting, host rocks, mineralogy, metal content as well as wall rock alterations, show similarities with volcanogenic massive sulfide (VMS) deposits. Accordingly, Nudeh Cu deposit is regarded as a Besshi - or pelitic mafic VMS deposit.
