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Title

Petrological and isotopic study of basaltic rocks of Barzand area and comparison of them with Poshtasar basalts in South of Germi

Pages

  23-52

Abstract

 The Alborz-Azerbaijan magmatic zone in northwest of Iran, particularly in the Talysh zone is the important volcanic zone during the Cenozoic period. The south Germi basaltic rocks (Ardabil province), trending northwest-southweast, exposed as several outcrops. The studied basaltic rocks in Barzand area (the continuation of Kousmalyn basaltic rocks in Iran) are in parallel trend with Poshtasar basalts, but they, according to stratigraphic study, are older. The studied basalts with prismatic structure mostly have mugearitic composition and show hyalomicroporphyritic and glomeroporphyritic textures. The main minerals are Ca-rich plagioclase and diopsidic clinopyroxenes. A lesser amount of opaque minerals accompanied by microlitic sanidine, pargasitic amphibole, biotite and leucite can be seen in these rocks. Leucites generally have been altered to analcime. The parent magma of these rocks has a potassic and shoshonitic nature. On multi-element diagrams Ta, Ti and Nb show depletion and LILE, LREE are enriched suggesting their primary magma have been originated from a subduction related mantle source. According to radiogenic isotopic ratios, the mantle source of the Barzand basaltic rocks have been derived from a fertilized mantle source during 0. 8 to 0. 9 billion years ago. According to initial 87Sr/86Sr (0. 70499 ± 0. 0004) and initial 143Nd/144Nd ratios (0. 5127 ± 0. 0004), it is estimated that the age of the studied rocks varies from 39± 1. 7 to 41± 1. 5 million years. Geochemical evidences show the primary magma of the Barzand basaltic rocks was originated from 5% partial melting of a phlogopite-beaing spinel garnet lherzolite mantle while the Poshtasar basaltic rocks from more than 5% partial melting of a phlogopite-beaing spinel garnet lherzolite mantle. These rocks are related to a subduction zone mantle source that metasomatized by subduction related agents that mainly generated from turbiditic sediments. The Barzand basaltic rocks display common features with those of the younger Poshtasar basaltic rocks, indicating they all have been erupted in a Post collisional arc tectonic setting.

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    APA: Copy

    MOBASHERGERMI, MOHAMMAD, ZAREI SAHAMIEH, REZA, AGHAZADEH, MEHRAJ, Ahmadikalaji, Ahmad, Ahmadzadeh, Golamreza, & Roux, Peter Le. (2019). Petrological and isotopic study of basaltic rocks of Barzand area and comparison of them with Poshtasar basalts in South of Germi. PETROLOGY, 10(37 ), 23-52. SID. https://sid.ir/paper/404238/en

    Vancouver: Copy

    MOBASHERGERMI MOHAMMAD, ZAREI SAHAMIEH REZA, AGHAZADEH MEHRAJ, Ahmadikalaji Ahmad, Ahmadzadeh Golamreza, Roux Peter Le. Petrological and isotopic study of basaltic rocks of Barzand area and comparison of them with Poshtasar basalts in South of Germi. PETROLOGY[Internet]. 2019;10(37 ):23-52. Available from: https://sid.ir/paper/404238/en

    IEEE: Copy

    MOHAMMAD MOBASHERGERMI, REZA ZAREI SAHAMIEH, MEHRAJ AGHAZADEH, Ahmad Ahmadikalaji, Golamreza Ahmadzadeh, and Peter Le Roux, “Petrological and isotopic study of basaltic rocks of Barzand area and comparison of them with Poshtasar basalts in South of Germi,” PETROLOGY, vol. 10, no. 37 , pp. 23–52, 2019, [Online]. Available: https://sid.ir/paper/404238/en

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