Geochemical characteristics of Sabalan volcanic rocks in Northwestern Iran

Yıl 2019, Cilt: 158 Sayı: 158, 217 - 233, 25.04.2019

Reza Fahım Guılany Ali Darvıshzadeh Seyed Jamal Sheıkhzakarıaee Mansour Vosoughı Abedını

https://doi.org/10.19111/bulletinofmre.451565

Cited By: 1

Öz

Sabalan is a voluminous
stratovolcano situated in the northwestern part of Alborz-Azerbaijan zone, 25km
from Meshkinshahr. It is separated by tectonic faults from Sarab plain and Meshkinshahr.
The composition of Sabalan volcanic rocks ranges from andesite, trachyandesite to
dacite. The rocks have hypocrystalline porphyritic texture with a glassy matrix
and microlite. Plagioclase, amphibole, pyroxene, biotite, and oxides are the main
phenocryst phase of the rocks. Some plagioclases show disequilibrium textures (sieve
texture and oscillatory zoning). The sieve texture and oscillatory zoning in the
plagioclases may be indicative of magma mixing processes in the genesis of the Sabalan
volcanic rocks. Geochemical data reveal that the Sabalan lavas exhibit calk-alkaline
major-oxide trends with a sodic character and they range in composition from andesite
to dacite. Pre-caldera and post-caldera volcanic rocks have similar geochemical
features with enrichments in LILE and LREE relative to HFSE and HREE, respectively,
and have negative Ti, Nb, and Ta anomalies. Ba/Ta ratios higher than 450 and La/Nb
ratios ranging between 2 and 3 indicate a volcanic arc setting for the studied rocks.
Based on field and geochemical studies, Sabalan is a subduction-related volcano,
occurred as a result of subduction of Neo-Tethyan oceanic crust beneath the Iranian
microplate.

Anahtar Kelimeler

Sabalan volcano, subduction, geochemistry, calc- alkaline

Kaynakça

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