Geochemical characteristics of Yamadagi volcanics in central east Anatolia: an example from collision-zone volcanism
Özet
Neogene Yamadagi 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 Sr-87/Sr-86 (0.70389-0.70633) and high Nd-143/Nd-144 ratios (0.51267-0.51276) and mostly plot within the mantle array of the isotope ratio diagram. The linear correlations among Sr-87/Sr-86 - Nd-143/Nd-144, SiO2 - Sr-87/Sr-86 and SiO2 - Nd-143/Nd-144 isotope ratios in the volcanics suggest that fractional crystallization combined with minor assimilation was an important process within the collision zone. (C) 1998 Elsevier Science B.V. All rights reserved.
Kaynak
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCHCilt
85Sayı
01.AprKoleksiyonlar
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