Geochemical and petrologic evolution of Otlakbaşı basaltic volcanism to the east of Lake Van

Year 2018, Volume: 157 Issue: 157, 1 - 21, 15.12.2018

Vural Oyan

https://doi.org/10.19111/bulletinofmre.427782

Cited By: 1

Abstract

Collision-related Otlakbaşı volcanism to the east of Lake
Van occurred by eruptions from extensional fissures. In this study, it is
investigated new Ar-Ar age data and major, trace and rare earth elements
characteristics of the Otlakbaşı basaltic volcanism. The Ar-Ar age data
indicate that this basaltic volcanism erupted in Early Pliocene time in
contrast to its previously known as Quaternary age. The volcanic products are
basaltic composition and close to alkaline-subalkaline division line. Results
of fractional crystallization accompanied by assimilation (AFC) modeling imply
that fractional crystallization can be negligible compared to crustal
contamination in the evolution processes of the magma chamber and ratio of the
crustal contamination to the fractional crystallization (r values) varies
from 0.1 to 0.35. Enrichment of large ion lithophile elements (LILE) and light
rare earth elements (LREE) relative to high strength field elements (HFSE) and
behavior of mobile elements (Ba and Th) reveal that the mantle source region of
the Otlakbaşı basaltic volcanism might have been enriched by melts that were
derived from subducted sediments. Depletion in Rb and K elements of the
fractionated-corrected samples indicate that amphibole and/or phlogopite could
be the presence in the mantle source. Results of partial melting model studies
show that this basaltic volcanism can be predominantly produced by the melting
of the spinel peridotite source. Metasomatized spinel bearing lithospheric
mantle may be responsible for the eruption of the Otlakbaşı basaltic volcanism.

Keywords

Eastern Anatolia, Otlakbaşı volcanism, crustal contamination, partial melting, spinel peridotite

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