Geochemistry, tectonic environment and origin of Oligo-Miocene lavas in Zoolesk area, northeast of Sarbisheh (Southern Khorasan)

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Kouchi m.; MOHAMMADI S.S.; NAKHAEI M.

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Journal: GEOSCIENCES Year:2019 | Volume:28 | Issue:110 Page(s): 255-266

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Title

Geochemistry, tectonic environment and origin of Oligo-Miocene lavas in Zoolesk area, northeast of Sarbisheh (Southern Khorasan)

Author(s)

Kouchi m. | MOHAMMADI S.S. | NAKHAEI M. | Issue Writer Certificate

Keywords

AndesiteQ2

Oligo-MioceneQ1

Active continental marginQ2

ZooleskQ1

Lut blockQ2

Abstract

In northeast of Sarbisheh, southern Khorasan, outcrops of lava rocks exist that from view of geological subdivisions, located in eastern part of Lut block. Petrographic composition of studied rocks include of Andesite (pyroxene Andesite, Andesite, trachy Andesite), dacite and rhyolite. The main textures of these rocks are porphyry with microlitic-glass groundmass, glomeroporphyritic, poikilitic and vesicular. The constituent minerals of Andesites are plagioclase, pyroxene and amphibole with small amounts of biotite and sanidine, in rhyolite and dacite include of quartz, sanidine, plagioclase, amphibole and biotite. Disequilibrium textures such as chemical zoning, sieve texture, rounded and gulf shape margins observed in phenocrysts of these rocks. Geochemical studies results show that these lavas belong to high to medium-K calc alkaline series. Enrichment in LREE and LILE, depletion in HREE and HFSE with negative anomaly of Ti, Nb and P in these rocks suggests Active continental margin volcanic arc magmatism. Based on tectonic discrimination diagrams, Zoolesk area lavas are related to subduction zone and Active continental margin. Low ratio of Dy/Yb(<2) in studied lavas, represents a spinel lherzolite mantle source for magma.

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APA: Copy

Kouchi, m., MOHAMMADI, S.S., & NAKHAEI, M.. (2019). Geochemistry, tectonic environment and origin of Oligo-Miocene lavas in Zoolesk area, northeast of Sarbisheh (Southern Khorasan). GEOSCIENCES, 28(110 ), 255-266. SID. https://sid.ir/paper/32114/en

Vancouver: Copy

Kouchi m., MOHAMMADI S.S., NAKHAEI M.. Geochemistry, tectonic environment and origin of Oligo-Miocene lavas in Zoolesk area, northeast of Sarbisheh (Southern Khorasan). GEOSCIENCES[Internet]. 2019;28(110 ):255-266. Available from: https://sid.ir/paper/32114/en

IEEE: Copy

m. Kouchi, S.S. MOHAMMADI, and M. NAKHAEI, “Geochemistry, tectonic environment and origin of Oligo-Miocene lavas in Zoolesk area, northeast of Sarbisheh (Southern Khorasan),” GEOSCIENCES, vol. 28, no. 110 , pp. 255–266, 2019, [Online]. Available: https://sid.ir/paper/32114/en

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