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- W1659064756 abstract "This thesis revealed the petrological and geochemical characterization of post-collisional Quaternary basalts of Central Anatolia (Erciyes and Hasandag stratovolcanoes, and dispersed volcanisms of Obruk-Zengen and Karapinar), focusing on the spatiotemporal evolution of the magmatism in Cappadocia (Turkey).K-Ar geochronology indicated the coexistence of alkaline and calc-alkaline basalts from the same location and age. Moreover, the results also show that these basalts may be very young (a few thousand years). The mineralogy of Quaternary basalts from the Cappadocia is as follows: plagioclase, olivine, clinopyroxene, orthopyroxene and oxides (magnetite, ilmenite). Orthopyroxene is observed only in basalts of Erciyes, while it is lacking in Hasandag and dispersed volcanisms of Obruk-Zengen and Karapinar. The plagioclase phenocrysts often exhibit disequilibrium features attributed to magma mixing process: complex zoning (normal, inverse, oscillatory), concentric zones rich in melt inclusions, resorption features.However, the observed mineralogy is consistent with a dominant fractional crystallization process. The estimated geobarometer show that the origin of magmas of Erciyes is shallower than the other settings.The results in geochemistry confirm not only the mineralogical duality between Erciyes and the other settings but also the coexistence of alkaline (normative nepheline) and calc-alkaline characters of contemporary basalts. All studied basalts are enriched in LREE (Light Rare Earth Elements) and LILE (Large Ion Lithophile Elements). The isotopic data (Sr, Nd, Pb, O) indicate the importance of enriched lithospheric source. All geochemical data also display the signature of other sources and processes such as contamination by the continental crust and heritage of a former subduction." @default.
- W1659064756 created "2016-06-24" @default.
- W1659064756 creator A5071262280 @default.
- W1659064756 date "2015-09-01" @default.
- W1659064756 modified "2023-09-26" @default.
- W1659064756 title "Chronological, magmatological and geochemical study of post-collisional basaltic volcanism in Central Anatolia and its spatio-temporal evolution" @default.
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