K-Ar dating and trace element geochemistry of Bitlis ignimbrites generated by Quaternary Nemrut Volcano: implications for A2-type magma generation in Eastern Anatolia post-collisional extensional setting
نویسندگان
چکیده
In the study presented here, we investigated K-Ar age determination and petrological significance of trace element compositions Bitlis (Eastern Anatolia) ignimbrites associated with explosive activities well-known Nemrut volcano. geochronological dating ignimbrite flow deposits gave 790 ka which corresponds to first products pre-caldera stages stratovolcano. trachydacitic shoshonitic affinity are characterized by typical negative anomalies Eu, Nb-Ta, Ti in chondrite-normalized spider multi-element variation diagrams, plot fields within-plate post-collisional tectonic setting Rb vs Y+Nb discrimination diagram. Accordingly, similar that volcanic products, signatures (e.g., high Nb, Ce, Y, Zr contents) show coincidence geochemical characteristics A2-type silicic magmas. Relative upper crust, higher La/Ba Nb/La, lower Ba/Ta La/Ta ratios ignimbrites, close basalts, suggest an interaction between OIB-like basaltic magma crust. Our results point generation Eastern Anatolia extensional setting, pyroclastic rocks ignimbrites) formed partial melting crustal at shallow level via derived from a common mantle source.
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ژورنال
عنوان ژورنال: Bitlis Eren University journal of science and technology
سال: 2021
ISSN: ['2146-7706']
DOI: https://doi.org/10.17678/beuscitech.1021499