Geochemistry and U–Pb zircon geochronology of the Alvand plutonic complex in Sanandaj–Sirjan Zone (Iran): New evidence for Jurassic magmatism

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

doi:10.1016/j.jseaes.2010.04.014

Cited by 161 publications

(127 citation statements)

References 35 publications

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“…These ages are similar to other plutons dated in the Hamadan-Aligudarz section of SSZ [2][3][4], defining a main Middle-Jurassic magmatic event, lasting from 162 to 187 Ma.…”

Section: Introductionsupporting

confidence: 83%

“…At the extremities of the Boroujerd pluton (Figure 8) structures display dextral shearing. The lineations are the best indicators of the stretching direction to which the magma was subjected while the mineral fabric was forming [4,45,46]. This interpretation is strongly supported by the mafic dykes that crosscut the pluton in the very northwest of Boroujerd perpendicular to the magmatic lineations (Figure 8; [47]).…”

Section: Microstructuresmentioning

confidence: 79%

“…From a structural point of view, it is concluded that the plutons were subjected to an overall protracted N-S to NNW-SSE stretching regime during emplacement and cooling. The northeasterly-oriented oblique subduction of the Neotethys under the Central Iran led to dextral transpressive tectonism which is contemporaneous with the emplacement of the Boroujerd pluton, as inferred from regional studies [1][2][3][4]. The anisotropy is high in two parts; the southeastern part of Boroujerd pluton which experienced low temperature deformation and the northwestern part with mylonitic deformation (Figure 4).…”

Section: Microstructuresmentioning

confidence: 97%

“…in which K 1 and K 3 are the maximum and minimum susceptibilities, and D is the diamagnetic contribution considered to be constant and isotropic, and estimated as -1.4 × 10 -5 SI [4]. In these cases, a correlation exists between the bulk magnetic anisotropy and the fabric intensity, itself linked to the accumulated strain magnitude undergone by the rock in the magmatic and solid states [37,38].…”

Section: Magnetite Anisotropy Degree (Ppara)mentioning

confidence: 99%

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A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

Rasouli¹,

Ahadnejad

Esmaeily³

2012

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The Boroujerd pluton (ca 175 Ma) was emplaced in the Sanandaj-Sirjan zone (SSZ) active margin of Central Iran consists of monzogranite, granodiorite, and quartz-diorite. Microstructural studies show a continuum from magmatic to (sub) mylonitic deformations fabric. Intensity of deformation decreases from W-NW to E-SE. The overall magnetic fabric of the pluton yields steep NW-SE striking foliations and sub-horizontal lineations plunging both to the northwest and southeast. These features imply that during intrusion of the pluton, a NW-SE trending stretching was dominant. This stretching is ascribed to the transpressive deformation of the overriding SSZ during northeastward subduction of the Neotethys under the Iranian plate. The NW-SE trending lineations of the Gousheh pluton (ca 35 Ma) suggest that the transpressive regime was ongoing from the Mesozoic to late Eocene.

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“…These ages are similar to other plutons dated in the Hamadan-Aligudarz section of SSZ [2][3][4], defining a main Middle-Jurassic magmatic event, lasting from 162 to 187 Ma.…”

Section: Introductionsupporting

confidence: 83%

Section: Microstructuresmentioning

confidence: 79%

Section: Microstructuresmentioning

confidence: 97%

Section: Magnetite Anisotropy Degree (Ppara)mentioning

confidence: 99%

See 2 more Smart Citations

A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

Rasouli¹,

Ahadnejad

Esmaeily³

2012

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“…1). The ages of zircon U-Pb imply that many SSZ granitoids were emplaced during the Middle Jurassic (e.g., Shahbazi et al, 2010), Middle to Late Cretaceous (e.g., Ghalamghash et al, 2009), and Early Eocene (Mazhari et al, 2009). Closure of the oceanic crust domain was marked by the obduction of ophiolites along the main Zagros thrust in the Late Cretaceous to Paleocene (Agard et al, 2005) and of some gabbroic bodies in the Upper Eocene to Oligo-Miocene, indicating that the final closure of the Neo-Tethys and collision of Arabian plate and Central Iran occurred during the Neogene period (Berberian and Berberian, 1981;Azizi and Moinevaziri, 2009).…”

Section: Introductionmentioning

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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Jurassic rifting at the Eurasian Tethys margin: Geochemical and geochronological constraints from granitoids of North Makran, southeastern Iran

et al. 2015

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This study focuses on an east-west trending belt of granitic to intermediate intrusions and their volcanic cover in the northern Dur Kan Complex, a continental slice outcropping to the north of the exposed Makran accretionary wedge in southeastern Iran. Field observations, petrographic descriptions, trace element, and isotope analyses combined with U-Pb zircon geochronology are presented to determine the time frame of magmatism and tectonic setting during the formation of these rocks. Results document three magmatic episodes with different melt sources for (1) granites, (2) a diorite-trondhjemite-plagiogranite sequence, and (3) diabases and lavas. Granites, dated at 170-175 Ma, represent crystallized melt with a strong continental isotopic contribution. The diorite-trondhjemite-plagiogranite sequence is 165-153 Ma old and derives from a mantle magma source with minor continental contribution. East-west trending diabase dikes and bodies intruded the granitoids, which were eroded and then covered by Valanginian (140-133 Ma) alkaline lavas and sediments. Alkaline dikes and lavas have a mantle isotopic composition. Temporal correlation with plutonites of the Sanandaj-Sirjan Zone to the northwest defines a narrow, NW-SE striking and nearly 2000 km long belt of Jurassic intrusions. The increasing mantle influence in the magma sources is explained by thinning of continental lithosphere and related mantle upwelling/decompression melting. Accordingly, the formation of the studied igneous rocks is related to the extension of the Iranian continental margin, which ultimately led to the formation of the Tethys-related North Makran Ophiolites.

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Geochemistry and U–Pb zircon geochronology of the Alvand plutonic complex in Sanandaj–Sirjan Zone (Iran): New evidence for Jurassic magmatism

Cited by 161 publications

References 35 publications

A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

A preliminary study of the anisotropy of magnetic susceptibility (AMS) of Boroujerd granitoids, Sanandaj-Sirjan Zone, West Iran

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

Jurassic rifting at the Eurasian Tethys margin: Geochemical and geochronological constraints from granitoids of North Makran, southeastern Iran

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