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Petrology, geochemistry, Zircon dating and Sr-Nd isotopes of metamorphic and igneous rocks in Kabodan area, Northern Bardaskan, Khorasan Razavi province

Document Type : Original Research Paper

Authors

1 International Campus, Ferdowsi University of Mashhad, Mashhad, Iran

2 Professor, Department of Geology and Research Center for Ore Deposit of Eastern Iran, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran

3 Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran

Abstract

Damanghor area is located northern Bardaskan, Khorasan Razavi province, and structurally, it is a part of Taknar zone. Geology of the area includes of Taknar metamorphosed sedimentary rocks and metarhyolite, which is intruded by diabasic rocks as stoke and dyke. The texture of metarhyolies is porphyry and contains of quartz and feldspar, whereas diabas has ophitic texture and contain plagioclas, pyroxene, and hornblend. Age of metarhyolite and diabas determined 550 Ma (Neoprotrozoic) and 8.8 Ma (Miocene), respectively, using zircon U-Pb method. Metarhyolites have peraluminous nature and were formed at intracontinental rift. Low enrichment in LREE relative to HREE and Eu negative anomaly indicates the magma is formed at plagioclase stability depth. (87Sr/86Sr)i (0.700712),  (143Nd/144Nd)i (0.511852), and εNdi  (–1.51) values show source of magma was mantel or lower crust. Diabases have toleitic to metaaluminous nature and were formed at subduction zone. (87Sr/86Sr)i (0.710527),  (143Nd/144Nd)i (0.512716), and εNdi (+1.7) values indicate magma is drived from partial melting of metasomatized mantle wedge by released fluid of subducted slab, which is assimilated with continental crust. Taknar formation acidic Neoprotrozoic magmatism, which is formed at rift setting, associated with Miocene basic magmatism, which is formed at subduction zone, reveals an insight of tectonomagmatic conditions of Taknar zone in different times.

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References
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Scientific Quarterly Journal of Geosciences
Volume 29, Issue 113 - Serial Number 113
Serial Number 113, Volume 29, Autumn 2019
November 2019
Pages 189-198
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