Petrology and geochemistry of the Karaj Dam basement sill: Implications for geodynamic evolution of the Alborz magmatic belt

Maghdour-Mashhour, Reza; Esmaeily, Dariush; Shabani, Amir Ali Tabbakh; Chiaradia, Massimo; Latypov, Rais

doi:10.1016/j.chemer.2015.03.001

Cited by 14 publications

(7 citation statements)

References 96 publications

(161 reference statements)

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“…According to Molinaro, Zeyen, and Laurencin (2005), the Zagros Mountains are a young, active collisional belt developed at the frontier between the converging Arabian and Eurasian plates. Maghdour‐Mashhour et al (2015) and Verdel, Wernicke, Hassanzadeh, and Guest (2011) found that the rate of plate convergence has reduced from ~6–7 cm/yr in the Middle to Late Cretaceous to relatively slow values of 3–3.5 cm/yr during the latest Cretaceous, which persisted through the Eocene. Berberian and Berberian (1981) noted that tectonic activity in Iran included several stages of deformation with one of the most important stages being the tectonic events of the Neo‐Tethys oceanic plate after the Late Carboniferous.…”

Section: Geological Setting and Rock Typesmentioning

confidence: 99%

“…Geological maps illustrate the distribution of magmatism, reflecting the importance of Cenozoic magmatism in the region (Haghipour & Aghanabati, 1985; Yousefi, Sadeghian, Samyari, & Ghasemi, 2017). Also Maghdour‐Mashhour, Esmaeily, Shabani, Chiaradia, and Latypov (2015) have pointed to volcanic and plutonic rocks that outcrop in central (Urumieh–Dokhtar Magmatic Assemblage, UDMA) and north–northeastern Iran (Alborz Magmatic Belt, AMB); they proposed that this magmatism marked the beginning of subduction of the Neo‐Tethyan oceanic lithosphere beneath the south–southwestern border of the Turkish–Iranian high plateau and was approximately simultaneous with the closure of Palaeotethys in southern Eurasia during the Late Permian–Early Triassic. In several parts of the Central Iran Structural Zone (CISZ), there are numerous intrusions with intermediate to felsic compositions with adakitic geochemical signatures (Gardideh, Ghasemi, & Sadeghian, 2018; Jamshidi, Ghasemi, Miao, & Sadeghian, 2018; Jamshidi, Ghasemi, Troll, Sadeghian, & Dahren, 2015; Yousefi et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Petrology, petrogenesis, and geochronology review of the Cenozoic adakitic rocks of northeast Iran: Implications for evolution of the northern branch of Neo‐Tethys

et al. 2020

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Cenozoic adakitic rocks of the northern part of the Central Iran Structural Zone (CISZ) are among the notable geological features of the terrains in northeast Iran, so a comprehensive comparison of several of these adakitic sequences is presented. This lithogeochemical analysis is constrained to examining adakitic magmatism of the three magmatic belts within the CISZ, which from southeast to northeast and from oldest to youngest are as follows: (a) south of Shahrood‐Damghan, (b) north‐northwest of Sabzevar‐Neyshabour, and (c) south of Qouchan and west of Esfarayen. Radiogenic isotope analysis using Rb–Sr and Sm–Nd methods show that the adakitic rocks associated with Qouchan‐Esfarayen magmatism have 0.512581 to 0.51288 initial 143Nd/144Nd and 0.703903 to 0.705627 initial 87Sr/86Sr, with εNd −0.86 to 4.98. Adakitic rocks in south to southeast Shahrood have 0.512775 to 0.512893 initial 143Nd/144Nd and 0.703746 to 0.705314 initial 87Sr/88Sr, with εNd 3.69 to 6.0, and adakites emplaced into the Sabzevar ophiolite have 0.512846 to 0.512911 initial 143Nd/144Nd and 0.70379 to 0.705019 initial 87Sr/86Sr contents with εNd of 5.26 to 6.54. Isotopic initial ratios of Nd and Sr support an origin involving partial melting of the subducting oceanic lithosphere of the northern branch of Neo‐Tethys and the associated suprasubduction mantle wedge in producing these adakitic rocks.

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Section: Geological Setting and Rock Typesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Petrology, petrogenesis, and geochronology review of the Cenozoic adakitic rocks of northeast Iran: Implications for evolution of the northern branch of Neo‐Tethys

et al. 2020

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“…The AAMB is an important structural zone of the Alpine-Himalayan range, situated 200-500 km north of the Neotethys suture. It forms the easternmost portion of the Pontides Arc-Lesser Caucasus-AAMB belt in the Turkish-Iranian high plateau [24]. This magmatic belt is divided into western and eastern parts.…”

Section: Regional Geologymentioning

confidence: 99%

The Shah-Ali-Beiglou Zn-Pb-Cu (-Ag) Deposit, Iran: An Example of Intermediate Sulfidation Epithermal Type Mineralization

et al. 2018

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The Shah-Ali-Beiglou epithermal base metal-silver deposit is located in the Tarom-Hashjin metallogenic province (THMP) in northwestern Iran. This deposit is hosted by quartz monzonite dikes of Oligocene age and surrounded by andesite to trachyandesite volcanic and volcaniclastic rocks of Eocene age. The subvolcanic rocks in the study area vary in composition from quartz-monzonite to monzonite and have metaluminous, calc-alkaline to shoshonitic affinity. These rocks have I-type geochemical characteristic and are related to post-collisional tectonic setting. The mineralization occurs as NE-SW and E-W-trending brecciated veins controlled by strike-slip and normal faults, which are associated to the Late Oligocene compressional regime. The mineral paragenesis of the vein mineralization is subdivided into pre-ore stage, ore stage, post-ore stage, and supergene stage. Pre-ore stage is dominated by quartz, sericite, and subhedral to anhedral pyrite as disseminated form. Ore-stage is represented by quartz, sphalerite (from 0.1 mol % to 4 mol % FeS), galena, chalcopyrite, tetrahedrite-tennantite, minor seligmannite and enargite, as vein-veinlet, cement and clast breccias. Post-ore stage is defined by deposition of quartz and carbonate along with minor barite, and supergene stage is characterized by bornite, chalcocite, covellite, hematite, goethite, and jarosite. The ore mineralization is associated with the silicic alteration. The styles of alteration are silicic, carbonate, sericitic, chloritic, and propylitic. Fluid inclusions in sphalerite have a wide range of salinities between 0.35 wt % and 21.4 wt % NaCl equivalent and homogenization temperatures range from 123 to 320 • C. The isotopic values of sulfides vary from 2.8 to 6.7 suggesting a magmatic source for the sulfur. In the present study, based on geological setting, alteration style of the host and wall rocks, main textures, mineral assemblages, composition of ore minerals, and structural features, it is suggested that the mineralization in the Shah-Ali-Beiglou is similar to intermediate-sulfidation style of epithermal deposits.

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“…2011) and, more recently, on the geochemistry, petrogenetic features and geochronology of the Senj Mafic Sill (Maghdour-Mashhour et al . 2015; Nabatian et al . 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Geochemical and geochronological data indicate that the Senj Mo–Cu deposit is likely related to the Senj Mafic Sill emplaced at c. 40 Ma in an extensional regime associated with subduction of the Neo-Tethyan oceanic lithosphere (Maghdour-Mashhour et al . 2015; Nabatian et al . 2018).…”

Section: Introductionmentioning

confidence: 99%

Fluid inclusions and C–H–O–S–Pb isotope systematics of the Senj Mo–Cu deposit, Alborz magmatic belt, northern Iran: implications for fluid evolution and regional mineralization

Fazel

Mehrabi²,

Zamanian³

et al. 2022

Geol. Mag.

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The Middle Eocene Senj Mo–Cu deposit (1.3 Mt at 1.5 wt % Cu and 0.2 wt % Mo) is located in the central Alborz magmatic belt, northern Iran. Mineralization is characterized by multistage veins, which are hosted in volcanic and volcano-sedimentary strata of the Karaj Formation (c. 41–45 Ma), genetically associated with the Senj Mafic Sill (c. 40 Ma). Four generations of veins are documented based on mineral assemblages and cross-cutting relationships, sequentially: quartz–biotite–chalcopyrite (QBC veins), quartz–molybdenum (QM veins), quartz–pyrite (QP veins) and late calcite (LC veins). Three types of fluid inclusions (FIs) are present in multistage veins: liquid-rich two-phase (L-type), vapour-rich two-phase (V-type) and solid-bearing multi-phase (S-type) inclusions. FIs in the QBC and QM veins are predominantly V-type and S-type, together with minor L-type, whereas the QP and LC vein minerals only contain L-type fluid inclusions. The homogenization temperatures of FIs from QBC to LC veins vary from 320 to 425 °C, 308 to 390 °C, 214 to 288 °C and 145 to 243 °C, and their salinities range from 5.3 to 49.0, 6.2 to 39.7, 5.7 to 13.0, and 2.1 to 7.2 wt % NaCl equiv., respectively. The H–O–C isotope compositions favour a dominantly magmatic origin for the hydrothermal fluids, which were gradually diluted by meteoric waters. The S–Pb isotope data of sulphide minerals indicate that the sulphur and metals were sourced from a deep-seated magmatic reservoir. The Senj Mafic Sill and associated Mo–Cu mineralization was developed in a back-arc extension regime, which faults and crustal fracture systems served as conduits for hydrothermal fluid circulation and Mo-rich veining.

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Petrology and geochemistry of the Karaj Dam basement sill: Implications for geodynamic evolution of the Alborz magmatic belt

Cited by 14 publications

References 96 publications

Petrology, petrogenesis, and geochronology review of the Cenozoic adakitic rocks of northeast Iran: Implications for evolution of the northern branch of Neo‐Tethys

Petrology, petrogenesis, and geochronology review of the Cenozoic adakitic rocks of northeast Iran: Implications for evolution of the northern branch of Neo‐Tethys

The Shah-Ali-Beiglou Zn-Pb-Cu (-Ag) Deposit, Iran: An Example of Intermediate Sulfidation Epithermal Type Mineralization

Fluid inclusions and C–H–O–S–Pb isotope systematics of the Senj Mo–Cu deposit, Alborz magmatic belt, northern Iran: implications for fluid evolution and regional mineralization

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