Petrography, Geochemistry and tectonomagmatic setting of Tertiary volcanic rocks in Ebrahim Abad area (southwest of Gazik, Southern Khorasan)

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Amirteymoori Neda; MOHAMMADI SEYYED SAEID; NAKHAEI MALIHE

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Journal: PETROLOGY Year:2019 | Volume:10 | Issue:37 Page(s): 53-74

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Title

Petrography, Geochemistry and tectonomagmatic setting of Tertiary volcanic rocks in Ebrahim Abad area (southwest of Gazik, Southern Khorasan)

Author(s)

Amirteymoori Neda | MOHAMMADI SEYYED SAEID | NAKHAEI MALIHE | Issue Writer Certificate

Keywords

basaltic andesiteQ2

enriched mantleQ1

spinel-garnet lherzoliteQ1

Ebrahim AbadQ1

Sistan suture zoneQ2

Abstract

Volcanic rocks are observed in Ebrahim Abad area, southwest of Gazik and in southern Khorasan province that located in northern part of the Sistan suture zone. The studied lavas consist of basaltic andesite, andesite and dacite with Eocene to Miocene age accompanied by pyroclastic rocks such as tuff. The main minerals in the basaltic andesite include of plagioclase, pyroxene and olivine, in the andesite consists of plagioclase, hornblende and pyroxene and in the dacites composed of plagioclase, quartz and hornblende. Intermediate volcanic rocks have porphyritic with microlitic groundmass, megaporphyritic, glomeroporphyritic and poikilitic textures and common texture in dacite is porphyritic with microgranular groundmass. These rocks show disequilibrium evidences such as zoning in plagioclases, sieve texture and embayment in some minerals. Geochemical studies indicate that the lavas of Ebrahim Abad area belong to calc alkaline series. These rocks are enriched in LREE relative to HREE. The high value of LREE and large ion lithophile elements (LILE) relative to that of HFSE and negative Nb and Ti, anomaly represent a subduction tectonic environment and active continental margin. The original magma of these lavas probably derived from partial melting of spinel-garnet lherzolite mantle that enriched by subducted slab fluids.

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APA: Copy

Amirteymoori, Neda, MOHAMMADI, SEYYED SAEID, & NAKHAEI, MALIHE. (2019). Petrography, Geochemistry and tectonomagmatic setting of Tertiary volcanic rocks in Ebrahim Abad area (southwest of Gazik, Southern Khorasan). PETROLOGY, 10(37 ), 53-74. SID. https://sid.ir/paper/408635/en

Vancouver: Copy

Amirteymoori Neda, MOHAMMADI SEYYED SAEID, NAKHAEI MALIHE. Petrography, Geochemistry and tectonomagmatic setting of Tertiary volcanic rocks in Ebrahim Abad area (southwest of Gazik, Southern Khorasan). PETROLOGY[Internet]. 2019;10(37 ):53-74. Available from: https://sid.ir/paper/408635/en

IEEE: Copy

Neda Amirteymoori, SEYYED SAEID MOHAMMADI, and MALIHE NAKHAEI, “Petrography, Geochemistry and tectonomagmatic setting of Tertiary volcanic rocks in Ebrahim Abad area (southwest of Gazik, Southern Khorasan),” PETROLOGY, vol. 10, no. 37 , pp. 53–74, 2019, [Online]. Available: https://sid.ir/paper/408635/en

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