The Almogholagh pluton, Sanandaj-Sirjan zone, Iran: geochemistry, U-(Th)-Pb titanite geochronology and implications for its tectonic evolution

Shahbazi, Hossein; Siebel, Wolfgang; Ghorbani, Mansour; Pourmoafee, M.; Sepahi, Ali; Abedini, M. Vousoughi; Shang, C. K.

doi:10.1127/njma/2014/0273

Cited by 10 publications

(14 citation statements)

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“…As noted in some publications, both compressional and extensional tectonic regimes are considered to have caused such magmatism in the region (e.g. Shahbazi et al 2015;Sarjoughian et al 2016). The studied pegmatites and their host granitoids show signatures of rocks formed in orogenic systems, so we emphasize that Jurassic magmatism of the region has been induced during orogenesis.…”

Section: C Geodynamics Remarksmentioning

confidence: 69%

“…Northwest of SSZ a spectrum of granitoid types is present including I-, S-, M-and A-type. Plutonic bodies, of which substantial parts are granitoids, occur in many localities, such as Hasanrobat (Muteh) (Alirezaei & Hassanzadeh, 2012), Aligoudarz (Esna-Ashari et al 2012), Azna (Moazzen et al 2004), Boroujerd (Ahmadi-Khalaji et al 2007, Malayer (Samen) (Ahadnejad et al 2011), Alvand (Hamedan) (Sepahi 2008;Shahbazi et al 2010), Almogholagh (Shahbazi et al 2015) and Qorveh (Yajam et al 2015). Granitic pegmatites and aplites are not volumetrically large in some of these bodies, but they can be important in the interpretation of the tectono-magmatic history of the region as their host granitoids.…”

Section: C Geodynamics Remarksmentioning

confidence: 99%

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Rare sapphire-bearing syenitoid pegmatites and associated granitoids of the Hamedan region, Sanandaj–Sirjan zone, Iran: analysis of petrology, lithogeochemistry and zircon geochronology / trace element geochemistry

et al. 2020

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Pegmatites and associated granitoids are integral parts of the Alvand plutonic complex in the Sanandaj–Sirjan zone, Iran. Whole rock major- and trace-element lithogeochemistry together with zircon U–Pb geochronology and zircon geochemistry are examined to evaluate the petrogenesis of sapphire-bearing pegmatites and other peraluminous pegmatites in the region. Pegmatites vary in their chemical compositions from mostly peraluminous, high-K calc-alkaline to shoshonitic signatures. A rare variety of extremely peraluminous sapphire-bearing syenitoid pegmatite (Al2O3 > 30 wt %; A/CNK > 2) exists. This silica-undersaturated pegmatite and its sapphire crystals have a primary igneous origin. U–Pb zircon geochronology of three separate samples from this pegmatite indicates the following ages: 168 ± 1 Ma, 166 ± 1 Ma and 164 ± 1 Ma. The zircon grains have notable amounts of Hf (up to 17 200 ppm), U (up to 13 580 ppm), Th (up to 5148 ppm), Y (up to 4764 ppm) and ∑REE (up to 2534 ppm). There is a positive correlation between Hf and Th, Nb and Ta, U and Th, and Y and HREE and a negative correlation between Hf and Y values in the zircons. These zircons exhibit pronounced positive Ce anomalies (Ce/Ce* = 1.15–68.06) and negative Eu anomalies (Eu/Eu* = 0.001–0.56), indicative of the relatively oxidized conditions of the parent magma. Ti-in-zircon thermometry reveals temperatures from as low as ~683 °C up to ~828 °C (average = 755° ± 73 °C). Zircon and monazite saturation equilibria are also consistent with these temperatures. Zircon grains are magmatic (average La < 1.5, (Sm/La)N > 100 and Th/U > 0.7), with chemical characteristics similar to zircons from continental crust.

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Section: C Geodynamics Remarksmentioning

confidence: 69%

Section: C Geodynamics Remarksmentioning

confidence: 99%

Rare sapphire-bearing syenitoid pegmatites and associated granitoids of the Hamedan region, Sanandaj–Sirjan zone, Iran: analysis of petrology, lithogeochemistry and zircon geochronology / trace element geochemistry

et al. 2020

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“…The basement of the SaSZ is also present as crustal xenoliths in the Qezeljeh Kand Plio-Quaternary volcanic cones (Veysi et al 2015) 20 km NW of the Sari Gunay area. Carboniferousearly Permian A-type granitoids, such as the Hasanrobat, Ghushchi and Hasansalaran granites in the Golpaygan area, are associated with the early-stage Neotethys opening (Alirezaei & Hassanzadeh, 2012;Shafaii Moghadam et al 2015;Azizi et al 2017), whereas Middle Jurassic -Early Cretaceous gabbroic to granitoid plutonic rocks are related to the subduction of Neotethys Ocean (Shahbazi et al 2010(Shahbazi et al , 2015Azizi et al 2011Azizi et al , 2019a. Based on regional geological maps (Khan Nazar et al 2015), Triassic Alisadr Limestone and the Jurassic Hamedan Phyllite are the oldest rocks in the study area (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

Zircon U–Pb ages and petrogenesis of late Miocene adakitic rocks from the Sari Gunay gold deposit, NW Iran

et al. 2021

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Late Miocene volcanic rocks host the Sari Gunay epithermal gold deposit in NW Iran. These rocks are located within the Hamedan–Tabriz volcanic belt and occupy the northwestern part of the Sanandaj–Sirjan zone (SaSZ). The volcanic rocks span in composition from latite to dacite and rhyolite. Plagioclase, hornblende, biotite and quartz are the main phenocrysts in a fine-grained and glassy matrix. Laser ablation inductively coupled plasma mass spectrometry zircon U–Pb dating yielded crystallization ages of 10.10 ± 0.01 Ma and 11.18 ± 0.14 Ma for rhyolite and dacite, respectively. High ratios of Sr/Y (> 20) and La/Yb (> 20), high contents of Sr (≥ 400 ppm), low contents of MgO (≤ 6 wt%), Y ≤ 18 ppm (c. 16.5 ppm), Yb ≤ 1.9 ppm (c. 1.53 ppm) and weak negative Eu anomalies (Eu*/Eu c. 0.81) are compatible with a high-silica adakitic signature of the rocks. Regarding the location of the study area nearly 100 km from the Zagros suture zone, we argue that delamination of lithospheric mantle beneath the SaSZ has played a key role in the development of the adakitic rocks in a post-collision tectonic regime. The adakitic melts are suggested to have formed by partial melting of delaminated continental lithosphere and/or lower crustal amphibolite following the collision of the Arabian and Iranian plates.

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“…Abbreviations: SQ, Saqqez; SD, Sanandaj; GV, Ghorveh; AM (square as Fig. 2 reported the presence of rocks, such as granite, quartz monzonite, monzonite, and monzodiorite, in this pluton (Shahbazi et al, 2015). Mohajjel and Izadi Kian (2007) have proven the occurrence of four deformations (D 1 -D 4 ) in the Almogholagh area that the pluton intruded during D 2 deformation.…”

Section: Geological Settingmentioning

confidence: 99%

“…Mohajjel and Izadi Kian (2007) have proven the occurrence of four deformations (D 1 -D 4 ) in the Almogholagh area that the pluton intruded during D 2 deformation. Valizadeh and Zarian (1976), Shahbazi et al (2015), and Amiri (2015) found that the ages of the Almogholagh masses are 144 ± 17, 95-138, and 131 ± 25 Ma by using three-point Rb-Sr whole-rock isochron, UPb and U-Th-Pb methods (for magmatic sphenes), and seven-point Rb-Sr whole-rock isochron, respectively.…”

Section: Geological Settingmentioning

confidence: 99%

Geothermobarometry of amphiboles in intermediate to basic rocks from the Almogholagh pluton in western Iran

Amiri

Khalaji

Tahmasbi

et al. 2016

Journal of Mineralogical and Petrological Sciences

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In this study, some barometries and thermometries were used to calculate the crystallization temperature and pressure of amphiboles in intermediate to basic rocks from the Almogholagh pluton in western Iran. Intersection among geothermometers was introduced as a method to estimate crystallization temperature, and the results obtained were compared with those of other methods. Results showed that obtaining the average pressure from the intersections between geothermometers and geobarometers is a suitable approach to determine the crystallization pressure of the analyzed points of amphiboles, whereas the crystallization temperature can be appropriately determined from the intersection among geothermometers. In addition, the average temperature of the HB 2 94 geothermometer is approximately equal to the average temperature in intersection among geothermometers. HB 2 94 is apparently a suitable geothermometer to determine the crystallization temperature in intermediate to basic rocks. In this study, the average crystallization temperature and pressure using intersection methods were 714-719°C and 6.5-7.5 kbar, respectively. Adopting these methods to the Almogholagh pluton, intermediate to basic rocks intruded at a depth of 24-28 km of the crust and at 674-759°C.

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The Almogholagh pluton, Sanandaj-Sirjan zone, Iran: geochemistry, U-(Th)-Pb titanite geochronology and implications for its tectonic evolution

Cited by 10 publications

References 0 publications

Rare sapphire-bearing syenitoid pegmatites and associated granitoids of the Hamedan region, Sanandaj–Sirjan zone, Iran: analysis of petrology, lithogeochemistry and zircon geochronology / trace element geochemistry

Rare sapphire-bearing syenitoid pegmatites and associated granitoids of the Hamedan region, Sanandaj–Sirjan zone, Iran: analysis of petrology, lithogeochemistry and zircon geochronology / trace element geochemistry

Zircon U–Pb ages and petrogenesis of late Miocene adakitic rocks from the Sari Gunay gold deposit, NW Iran

Geothermobarometry of amphiboles in intermediate to basic rocks from the Almogholagh pluton in western Iran

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