Geochemical and Nd-Sr Isotopic Compositions of Hypabyssal Adakites in the Torud-Ahmad Abad Magmatic Belt, Northern Central Iran Zone: Analysis of Petrogenesis and Geodynamic Implications

Fazilat Yousefi; Ryan D. Mills; Mahmoud Sadeghian; David R. Lentz; Christina Wanhainen; Habibollah Ghasemi; Laicheng Miao

doi:10.1007/s12583-020-1378-7

Volume 32 Issue 6

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Journal of Earth Science > 2021 > 32(6): 1428-1444.

Fazilat Yousefi, Ryan D. Mills, Mahmoud Sadeghian, David R. Lentz, Christina Wanhainen, Habibollah Ghasemi, Laicheng Miao. Geochemical and Nd-Sr Isotopic Compositions of Hypabyssal Adakites in the Torud-Ahmad Abad Magmatic Belt, Northern Central Iran Zone: Analysis of Petrogenesis and Geodynamic Implications. Journal of Earth Science, 2021, 32(6): 1428-1444. doi: 10.1007/s12583-020-1378-7

Citation:

Fazilat Yousefi, Ryan D. Mills, Mahmoud Sadeghian, David R. Lentz, Christina Wanhainen, Habibollah Ghasemi, Laicheng Miao. Geochemical and Nd-Sr Isotopic Compositions of Hypabyssal Adakites in the Torud-Ahmad Abad Magmatic Belt, Northern Central Iran Zone: Analysis of Petrogenesis and Geodynamic Implications. Journal of Earth Science, 2021, 32(6): 1428-1444. doi: 10.1007/s12583-020-1378-7

Citation:

Fazilat Yousefi, Ryan D. Mills, Mahmoud Sadeghian, David R. Lentz, Christina Wanhainen, Habibollah Ghasemi, Laicheng Miao. Geochemical and Nd-Sr Isotopic Compositions of Hypabyssal Adakites in the Torud-Ahmad Abad Magmatic Belt, Northern Central Iran Zone: Analysis of Petrogenesis and Geodynamic Implications. Journal of Earth Science, 2021, 32(6): 1428-1444. doi: 10.1007/s12583-020-1378-7

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Geochemical and Nd-Sr Isotopic Compositions of Hypabyssal Adakites in the Torud-Ahmad Abad Magmatic Belt, Northern Central Iran Zone: Analysis of Petrogenesis and Geodynamic Implications

doi: 10.1007/s12583-020-1378-7

1.
Department of Earth Sciences, University of New Brunswick, Fredericton, Canada
2.
Department of Geological Sciences, University of North Carolina at Chapel Hill, Chapel Hill, USA
3.
Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
4.
Department of Civil, Environmental and Natural Resources Engineering, Lulea University of Technology, Lulea, Sweden
5.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

More Information

Corresponding author: Fazilat Yousefi, f.yousefi87@gmail.com
Received Date: 21 May 2020
Accepted Date: 27 Nov 2020
Publish Date: 30 Dec 2021

Abstract

Abstract

Eocene intermediate to felsic subvolcanic rocks of the Torud-Ahmad Abad magmatic belt (TAMB), in the northern part of the Central Iran zone, are exposed between the Torud and Ahmad Abad regions in South-Southeast Shahrood. These igneous rocks include hypabyssal dacite, trachyte, andesite, trachy-andesite, and basaltic andesite; they are mainly composed of phenocrysts and microcrystalline groundmass of pyroxene, amphibole, and plagioclase, with minor biotite and titanomagnetite; they form domal structures (plugs and stocks), dikes, and sills that intruded into Neoproterozoic to cogenetic Eocene volcano-sedimentary sequences. Based on isotopic analysis of these intermediate to acidic rocks, initial ratios of ¹⁴³Nd/¹⁴⁴Nd range from 0.512 775 to 0.512 893 and initial ratios of ⁸⁷Sr/⁸⁶Sr range from 0.703 746 to 0.705 314, with quite positive ɛ_Nd(i)values of +3.69 to +6.00. They are enriched in light rare earth elements and large ion lithophile elements and depleted in heavy rare earth elements and high-field strength elements, the SiO₂ content is (52-62) wt.%, and Na₂O content > 3 wt.%, Al₂O₃ content > 16 wt.%, Yb < 1.8 ppm, and Y < 18 ppm. These geological, geochemical, and Sr and Nd isotopic data are consistent with adakitic signatures originating by partial melting of the subducted Neo-Tethys oceanic slab (Sabzevar branch) and lithospheric suprasubduction zone mantle. The mantle signatures typifying the rapidly emplaced adakitic rocks (slab (high-silica adakite) and suprasubduction zone (low-silica adakite) melts) together with their locally voluminous extent are evidences that support a locally extensional geodynamic setting; and the evidence is consistent with an evolution to local transpression in the Late Eocene in this convergent margin arc environment to rifting (basalts to adakites) towards submarine conditions in the Neogene.
- isotope geochemistry,
- adakite rocks,
- Central Iran zone,
- Shahrood,
- Iran

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References(90)

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