Neogene and quaternary volcanism in Eastern Azerbaijan (Iran): some K-Ar age determinations and geodynamic implications

Alberti, Antonio; Comin-Chiaramontí, P.; Sinigoi, S.; Nicoletti, M.; Petrucciani, C.

doi:10.1007/bf01869034

Cited by 12 publications

(19 citation statements)

References 14 publications

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“…Some models have been proposed for the generation of this calc-alkaline volcanism in northwestern Iran (HTV) by Innocenti et al (1976), Bird et al (1975), and Alberti et al (1980). According to Innocenti et al (1976), the diachronous end of the calc-alkaline volcanism in eastern Anatolia and western and central Iran is basically the result of the end of subduction and the collision of masses representing continental margins with different geometries (after Alberti et al, 1980).…”

Section: Discussionmentioning

confidence: 99%

Review of the tectonic setting of Cretaceous to Quaternary volcanism in northwestern Iran

Azizi

Moinevaziri

2009

Journal of Geodynamics

157

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Section: Discussionmentioning

confidence: 99%

Review of the tectonic setting of Cretaceous to Quaternary volcanism in northwestern Iran

Azizi

Moinevaziri

2009

Journal of Geodynamics

157

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“…The volcanic sequences in the Ahar area are correlatable with the eastern part of Turkey. According to the study of Alberti et al (1980), Innocenti et al (1982), Moinevaziri (1985), Mitchell et al (1999) and Jamali et al (2010) the last phase of volcanic activity in this area occurred in Quaternary. The oldest unit of this region is Cretaceous (?)…”

Section: Geological Settingmentioning

confidence: 96%

Quaternary post-collision alkaline volcanism NW of Ahar (NW Iran): geochemical constraints of fractional crystallization process

Dabiri¹,

Emami²,

Mollaei³

et al. 2011

Geologica Carpathica

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Major and trace elements and Sr-Nd isotopic data are presented for the Quaternary alkaline volcanism NW of Ahar (NW Iran). The exposed rocks mainly consist of alkali basalts, trachybasalts, basaltic trachyandesites and trachyandesites. Alkali basalts and trachybasalts display microlithic porphyritic texture with phenocrysts of olivine, clinopyroxene, and plagioclase in microlithic groundmass. In the more evolved rocks (basaltic trachyandesites and trachyandesites), amphibole and biotite have appeared. Sr ratio and high MgO, Ni and Cr contents indicate that they were generated from relatively primitive magmas. Ba, Cr and La/Sm ratios versus Rb suggest that fractional crystallization of alkali basalts could have played a significant role in the formation of evolved rocks. Assimilation and fractional crystallization modelling, as well as Rb/Zr, Th/Yb and Ta/Yb ratios clearly indicate that crustal contamination accompanied by the fractional crystallization played an important role in petrogenesis of the trachyandesites. The small compositional differences between magma types, isotopic composition, mineralogy and nonlinear trends on Harker diagrams also indicate that magma mixing was not an essential process in the evolution of the Ahar magmas. Petrogenetic modelling has been used to constrain sources. Trace element ratio plots and REE modelling indicate that the alkali basalts were generated from a spinel-peridotite source via small degrees (~2.5%) of fractional melting.

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“…1) (Alberti et al 1980;Yilmaz et al 1990;Trifonov et al 2012;Kheirkhah & Mirnejad 2014). Some researchers suggest that there is a petrogenetic relationship between the Cenozoic magmatism of this igneous province and those of Alborz and UDMA in Iran (Alberti et al 1976;Innocenti et al 1982;Jahangiri 2007;Azizi & Moinevaziri 2009;Ahmadzadeh et al 2010;Allen et al 2011;Dabiri et al 2011;Jamali et al 2012).…”

Section: General Geologymentioning

confidence: 99%

“…2 (Amini 1987). The Miocene volcanic rocks of Qisir Dagh are overlain by volcanoclastic sediments of the pre-Sabalan stage (Didon & Gemain 1976;Alberti et al 1976;Amini 1987). Didon & Gemain (1976) suggest that Qisir Dagh is an eroded stratovolcano and the depression which divides it into eastern and western parts is the eroded remnant of a caldera (Fig.…”

Section: General Geologymentioning

confidence: 99%

Crystal size and shape distribution systematics of plagioclase and the determination of crystal residence times in the micromonzogabbros of Qisir Dagh, SE of Sabalan volcano (NW Iran)

Pourkhorsandi¹,

Mirnejad²,

Raiesi³

et al. 2015

Geologica Carpathica

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Abstract:The Qisir Dagh igneous complex occurs as a combination of volcanic and intrusive rocks to the south-east of the Sabalan volcano, north-western Iran. Micromonzogabbroic rocks in the region consist of plagioclase, alkaline feldspar and clinopyroxene as the major mineral phases and orthopyroxene, olivine, apatite and opaque minerals as the accessory minerals. Microgranular and microporphyritic textures are well developed in these rocks. Considering the importance of plagioclase in reconstructing magma cooling processes, the size and shape distribution and chemical composition of this mineral were investigated. Based on microscopic studies, it is shown that the 2-dimensional size average of plagioclase in the micromonzogabbros is 538 micrometers and its 3-dimensional shape varies between tabular to prolate. Crystal size distribution diagrams point to the presence of at least two populations of plagioclase, indicating the occurrence of magma mixing and/or fractional crystallization during magma cooling. The chemical composition of plagioclase shows a wide variation in abundances of Anorthite-Albite-Orthoclase (An = 0.31-64.58, Ab =29.26-72.13, Or = 0.9-66.97), suggesting a complex process during the crystal growth. This is also supported by the formation of antiperthite lamellae, which formed as the result of alkali feldspar exsolution in plagioclase. The calculated residence time of magma in Qisir Dagh, based on 3D crystal size distribution data, and using growth rate G = 10 -10 mm/s, varies between 457 and 685 years, which indicates a shallow depth (near surface) magma crystallization and subvolcanic nature of the studied samples.

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Neogene and quaternary volcanism in Eastern Azerbaijan (Iran): some K-Ar age determinations and geodynamic implications

Cited by 12 publications

References 14 publications

Review of the tectonic setting of Cretaceous to Quaternary volcanism in northwestern Iran

Review of the tectonic setting of Cretaceous to Quaternary volcanism in northwestern Iran

Quaternary post-collision alkaline volcanism NW of Ahar (NW Iran): geochemical constraints of fractional crystallization process

Crystal size and shape distribution systematics of plagioclase and the determination of crystal residence times in the micromonzogabbros of Qisir Dagh, SE of Sabalan volcano (NW Iran)

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