Geochemical characteristics of Yamadağı volcanics in central east Anatolia: an example from collision-zone volcanism

Neogene Yamadağı volcanic rocks consist of basaltic trachyandesite, trachyandesite, andesite, and dacite. The major- and trace-element chemistry indicates that the lavas are dominantly calc-alkaline and mildly alkaline in character, sodic in nature, and intermediate to acidic in composition. REE and...

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Bibliographic Details
Published in:Journal of volcanology and geothermal research 1998-10, Vol.85 (1), p.303-326
Main Authors: Yalçın, Hüseyin, Gündoğdu, M.Niyazi, Gourgaud, Alain, Vidal, Philippe, Uçurum, Ali
Format: Article
Language:English
Subjects:
collision-zone volcanism
volcanic rocks
Yamadağı
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Summary:Neogene Yamadağı volcanic rocks consist of basaltic trachyandesite, trachyandesite, andesite, and dacite. The major- and trace-element chemistry indicates that the lavas are dominantly calc-alkaline and mildly alkaline in character, sodic in nature, and intermediate to acidic in composition. REE and trace-element patterns of volcanic rocks are similar to those typical of within plate magmatics. Volcanic rocks have low 87 Sr/ 86 Sr (0.70389–0.70633) and high 143 Nd/ 144 Nd ratios (0.51267–0.51276) and mostly plot within the mantle array of the isotope ratio diagram. The linear correlations among 87 Sr/ 86 Sr− 143 Nd/ 144 Nd , SiO 2− 87 Sr/ 86 Sr and SiO 2− 143 Nd/ 144 Nd isotope ratios in the volcanics suggest that fractional crystallization combined with minor assimilation was an important process within the collision zone.
ISSN:0377-0273
1872-6097
DOI:10.1016/S0377-0273(98)00061-4