Petrology and petrography consideration of Takestan North West tertiary volcanism (Gharebagh-Nikoieh)

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Research Paper 01/01/2015
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Petrology and petrography consideration of Takestan North West tertiary volcanism (Gharebagh-Nikoieh)

Zahra Mohtashamnejad
J. Bio. Env. Sci.6( 1), 682-689, January 2015.
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Present study considers a part of tertiary volcanism (middle-upper Eocene) in the west page 1:100000 of Takestan (Gharebagh to Nikoie).Regarding petrography studies, igneous rocks of this zone include acid to basic volcanic rocks such as dacite, trachydacite, trachyandesite, andesite, trachybasalt, andesite basalt, pitted andesite basalt, basaltic andesite, basalt (micro gabbro) and pyroclastic rocks include glassy iron released lapilli tuff and tuff ignimbrite.In petrology considerations of understudied zone, petrography evidences of magmatic intermixture were seen, among these evidences burned margin around biotite mineral, corrosion margin of plagioclase, oscillatory zoning of plagioclase, glomeroporphyritic texture, and sometimes presence of alkaline minerals such as pyroxene and plagioclase in acid dough can be mentioned.On the basis of geochemical graphs, Takestan volcanic alkaline rocks mostly are locatedin active continental margin and belong to orogenic zone.Dispersion of some chemical elements in Harker graphs can be attributed to some processes such as alteration or contamination and pollution of magmas that are creators of Takestan volcanic rocks with upper crust.


Amini S. 1981. Geological and petrological studies on Takestan, M.Sc. dissertation, Science College, University of Tehran.

Biria A. 1997. Geology and petrology of magmatic rocks of Qazvin’s North West (in the area of 1:500000 map Agha baba), M.Sc. dissertation, North Tehran branch, Islamic Azad University.

Cox KG, Bell GD, Pankhurst RJ. 1979. The interpretation of igneous rocks. George Alien and Unwin, London,450p.

De La Roche H. 1980. A classification of volcanic and plutonic rocks using R1- R2 diagrams and major element analyses- its relationships and current nomenclature. Chemical Geology, 29, 183-210.

Fodazi M. 2000. Petrological and geochemical considerations of magmatic rocks of temple zone, North West of Trood-Central Iran, M.Sc. dissertation, north Tehran branch, Islamic Azad University.

Fodazi M. 2008. Ptrological consideration of Ophiolite and Ophiolite mixture of North of Naeen with attitude to geochemical and geodynamism characteristics of sheeted dikes and pillow magmas, PhD thesis, Science and researches branch, Islamic Azad University.

Irvin TN, Baragar WRA. 1971. A guide to the chemical classification of the common volcanic rocks; Canadian Journal of Earth Sciences; 8, 523-548.Middlemost, E.A.K.Magma andmagma tic rocks.long man. Korl