Metallogeny and tectonic evolution of the Cenozoic Ahar–Arasbaran volcanic belt, northern Iran

Jamali, Hemayat; Dilek, Yıldırım; Daliran, Farahnaz; Yaghubpur, Abdolmajid; Mehrabi, Behzad

doi:10.1080/00206810903416323

Cited by 88 publications

(31 citation statements)

References 30 publications

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“…A Cretaceous island arc complex with calc-alkaline to alkaline extrusive rocks, and pyroclastic deposits, flysch units and marl-limestone rocks occurs north of the Sevan-Akera suture zone . Cenozoic magmatic rocks of the AALCB are mainly acidic to basic volcanic rocks and acidic to intermediate intrusive bodies, with calc-alkaline to alkaline affinities trending NW-SE and located in the northwestern Iran and Caucasus mountain ranges (Moayed, 2001;Jamali et al, 2010). Similar to UDMB, magmatic activities in this belt have been started in the Eocene and continued to Quaternary.…”

Section: Alborz-arasbaran-lesser Caucasus Belt (Aalcb)mentioning

confidence: 89%

“…There are scattered exposures of ophiolites and metamorphic rocks from Anzali to Sevan-Akera at northern margin of the AALCB (Fig. 1) Berberian et al, 1981;Jamali et al, 2010). Based on isotopic data, the formation of Sevan-Akera ophiolites have started in the MiddleLate Jurassic and continued to Early Cretaceous ).…”

Section: Alborz-arasbaran-lesser Caucasus Belt (Aalcb)mentioning

confidence: 99%

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Petrogenesis and Tectono-Magmatic Setting of Meso-Cenozoic Magmatism in Azerbaijan Province, Northwestern Iran

Jamali¹,

Yaghubpur²,

Mehrabi³

et al. 2012

Petrology - New Perspectives and Applications

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Section: Alborz-arasbaran-lesser Caucasus Belt (Aalcb)mentioning

confidence: 89%

Section: Alborz-arasbaran-lesser Caucasus Belt (Aalcb)mentioning

confidence: 99%

Petrogenesis and Tectono-Magmatic Setting of Meso-Cenozoic Magmatism in Azerbaijan Province, Northwestern Iran

Jamali¹,

Yaghubpur²,

Mehrabi³

et al. 2012

Petrology - New Perspectives and Applications

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“…During the Late Miocene to Quaternary, the Ahar-Arasbaran region, underwent regional contraction, shortening first in the N-NW direction and subsequently in the NNE direction. The NNE-oriented crustal shortening was accompanied by WNW stretching and extension and associated intensive alkaline magmatism in a broad zone of dextral transtension in the hinterland of the Arabia-Eurasia collision front (Mohajjel & Fergusson 2000;Sosson et al 2005;Masson et al 2006;Dilek et al 2010;Jamali et al 2010). …”

Section: Geological Settingmentioning

confidence: 99%

“…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: 99%

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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“…This magmatic activity was responsible for the contact metasomatic mineralization as well as the porphyry-type copper occurrences in NW Iran. As Figure 1 shows, the Gharah Dagh Formation is one of the important metallogenic provinces of the East Mediterranean Copper-Molybdenum belt (Bazin & Hübner 1969;Superceanu 1971;Rolland et al 2009;Jamali et al 2010). The associated intrusive bodies occur as batholiths as well as stocks, ranging in composition from quartz monzodiorite to granite, and the Ahar Batholith is the largest early Oligocene intrusion in the Gharah Dagh-Tarom plutonic belt (Lescuyer 1976).…”

Section: Introductionmentioning

confidence: 99%

Genetic relationships between skarn ore deposits and magmatic activity in the Ahar region, Western Alborz, NW Iran

Mollai¹,

Pe‐Piper²,

Dabiri³

2014

Geologica Carpathica

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Paleocene to Oligocene tectonic processes in northwest Iran resulted in extensive I-type calc-alkaline and alkaline magmatic activity in the Ahar region. Numerous skarn deposits formed in the contact between Upper Cretaceous impure carbonate rocks and Oligocene-Miocene plutonic rocks. This study presents new field observations of skarns in the western Alborz range and is based on geochemistry of igneous rocks, mineralogy of the important skarn deposits, and electron microprobe analyses of skarn minerals. These data are used to interpret the metasomatism during sequential skarn formation and the geotectonic setting of the skarn ore deposit related igneous rocks. The skarns were classified into exoskarn, endoskarn and ore skarn. Andraditic garnet is the main skarn mineral; the pyroxene belongs to the diopside-hedenbergite series. The skarnification started with pluton emplacement and metamorphism of carbonate rocks followed by prograde metasomatism and the formation of anhydrous minerals like garnet and pyroxene. The next stage resulted in retro gradation of anhydrous minerals along with the formation of oxide minerals (magnetite and hematite) followed by the formation of hydrosilicate minerals like epidote, actinolite, chlorite, quartz, sericite and sulfide mineralization. In addition to Fe, Si and Mg, substantial amounts of Cu, along with volatile components such as H 2 S and CO 2 were added to the skarn system. Skarn mineralogy and geochemistry of the igneous rocks indicate an island arc or subduction-related origin of the Fe-Cu skarn deposit.

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Metallogeny and tectonic evolution of the Cenozoic Ahar–Arasbaran volcanic belt, northern Iran

Cited by 88 publications

References 30 publications

Petrogenesis and Tectono-Magmatic Setting of Meso-Cenozoic Magmatism in Azerbaijan Province, Northwestern Iran

Petrogenesis and Tectono-Magmatic Setting of Meso-Cenozoic Magmatism in Azerbaijan Province, Northwestern Iran

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

Genetic relationships between skarn ore deposits and magmatic activity in the Ahar region, Western Alborz, NW Iran

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