Petrography and petrology of The Yürekli (Balıkesir) volcanics: an example of post-collisional felsic volcanism in the Biga peninsula (NW Turkey)

Year 2018, Volume: 157 Issue: 157, 103 - 120, 15.12.2018

Ece Simay Saatcı Zafer Aslan

https://doi.org/10.19111/bulletinofmre.428294

Cited By: 2

Abstract

In this study, the aim was to determine the petrography,
geochemistry and source of the Yürekli volcanics (Biga Peninsula, NW Turkey).
Tertiary volcanism is widespread in Western Anatolia (NW Turkey), which is
an important area where tectonic and magmatic events are observed
together. Yürekli volcanic rocks comprise dacitic lavas and pyroclastics.
Dacitic lavas show porphyric and hyaloporphyric texture, and consist of
plagioclase, quartz, amphibole, biotite, sanidine and Fe-Ti oxide minerals with
apatite and zircon accessory minerals. Petrologically, they have
high-potassic and calc-alkaline characteristics. Yürekli volcanics show
enrichment in large ion lithophile elements (LILE) and are depleted in high field
strength elements (HFSE) on the N-MORB normalized diagram. On the
chondrite-normalized rare earth element (REE) plot, light rare earth elements
are enriched but heavy rare earth elements are depleted in the rocks. REE
patterns are concave shaped (mean LaN/LuN=16–25) and show slight negative Eu
anomalies (0.66–0.81). Plagioclase, amphibole and biotite fractional
crystallisation and crustal assimilation are important in the evolution of the
Yürekli volcanics. According to all data, it can be argued that the Yürekli
volcanics formed in a post-collisional setting, and the parental magmas were
derived from the melts of enriched lithospheric mantle.

Keywords

Calc-alkaline rocks, geochemistry, fractional crystallization, tectonic setting, NW Anatolia

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