Geochemical characteristics of Yamadağı volcanics in central east Anatolia: an example from collision-zone volcanism |
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Authors: | Hüseyin Yaln MNiyazi Gündodu Alain Gourgaud Philippe Vidal Ali Uurum |
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Institution: | Hüseyin Yalç?n, M.Niyazi Gündo?du, Alain Gourgaud, Philippe Vidal,Ali Uçurum |
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Abstract: | 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 87Sr/86Sr (0.70389–0.70633) and high 143Nd/144Nd ratios (0.51267–0.51276) and mostly plot within the mantle array of the isotope ratio diagram. The linear correlations among 87Sr/86Sr−143Nd/144Nd, SiO2−87Sr/86Sr and SiO2−143Nd/144Nd isotope ratios in the volcanics suggest that fractional crystallization combined with minor assimilation was an important process within the collision zone. |
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Keywords: | volcanic rocks collision-zone volcanism Yamadağ ı |
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