Petrography, geochemistry, tectonic setting and petrogenesis of volcanic rocks in Robaie area (South of Damghan)

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Mahdavi Akerdi Mehdi; MALEKZADEH SHAFAROUDI AZADEH; KARIMPOUR MOHAMMAD HASSAN; RAHIMI BEHNAM; FRANCISCO SANTOS JOSE

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Journal: PETROLOGY Year:2020 | Volume:10 | Issue:40 Page(s): 23-44

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Title

Petrography, geochemistry, tectonic setting and petrogenesis of volcanic rocks in Robaie area (South of Damghan)

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Keywords

petrographyQ2

geochemistryQ1

subduction zoneQ1

Nd-Sr isotopesQ1

RobaieQ1

Central IranQ2

Abstract

The rocks of the Robaie area located in the Torud-Chahshirin belt and south of Damghan, includes the Eocene andesite and trachyandesite rocks in which subvolcanic igneous rocks as stoke and dyke with diorite, monzonite and monzodiorite porphyry composition are intruded. The main textures of volcanic rocks are porphyritic characterized by plagioclase, hornblende and biotite phenocrysts as well as apatite and zircon as minor minerals. The rocks studied are mainly of shoshonitic nature and only one sample is considered as high-K calc-alkaline. Several line of evidence including LILE and LREE enrichment, HREE and HFSE depletion, high Th/Yb with negative anomalies of Ti, Nb and the position of the samples on the tectonic discrimination diagrams indicate that the volcanic rocks in discussion were emplaced into the subduction zone related to an active continental margin setting. The initial 87Sr/86Sr, 143Nd/144Nd ratios and (ε Nd)i value of andesite are 0. 704445, 0. 512691 and 2. 29, respectively. All of these evidences confirm that the studied volcanic rocks were generated from partial melting of the mantle wedge above the subduction zone. Petrographic observations along with geochemistry of rare earth and trace elements suggest that the calc-alkaline affinity of the rocks studied and their parent magma from a subducted-related environment as well as crustal assimilation and fractional crystallization.

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APA: Copy

Mahdavi Akerdi, Mehdi, MALEKZADEH SHAFAROUDI, AZADEH, KARIMPOUR, MOHAMMAD HASSAN, RAHIMI, BEHNAM, & FRANCISCO SANTOS, JOSE. (2020). Petrography, geochemistry, tectonic setting and petrogenesis of volcanic rocks in Robaie area (South of Damghan). PETROLOGY, 10(40 ), 23-44. SID. https://sid.ir/paper/388288/en

Vancouver: Copy

Mahdavi Akerdi Mehdi, MALEKZADEH SHAFAROUDI AZADEH, KARIMPOUR MOHAMMAD HASSAN, RAHIMI BEHNAM, FRANCISCO SANTOS JOSE. Petrography, geochemistry, tectonic setting and petrogenesis of volcanic rocks in Robaie area (South of Damghan). PETROLOGY[Internet]. 2020;10(40 ):23-44. Available from: https://sid.ir/paper/388288/en

IEEE: Copy

Mehdi Mahdavi Akerdi, AZADEH MALEKZADEH SHAFAROUDI, MOHAMMAD HASSAN KARIMPOUR, BEHNAM RAHIMI, and JOSE FRANCISCO SANTOS, “Petrography, geochemistry, tectonic setting and petrogenesis of volcanic rocks in Robaie area (South of Damghan),” PETROLOGY, vol. 10, no. 40 , pp. 23–44, 2020, [Online]. Available: https://sid.ir/paper/388288/en

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