Zircon and apatite-bearing pyroxene hornblendite mantle xenolith from Hungary, Carpathian-Pannonian region

作者: Enikő Bali , Károly Hidas , Guðmundur H. Guðfinnsson , Zoltán Kovács , Kálmán Török

DOI: 10.1016/J.LITHOS.2018.07.004

关键词:

摘要: Abstract A composite xenolith composed of a zircon-bearing, apatite-rich olivine-pyroxene hornblendite and an amphibole harzburgite part was found in outcrop Neogene alkali basalt at Szigliget, Bakony-Balaton Highland Volcanic Field, Western Hungary. The is dominantly that strongly enriched incompatible trace elements along with apatite, orthopyroxene olivine. Zircon, rutile, ilmenite sulphide occur as inclusions the silicate minerals accessory phases. On basis chemical composition minerals, we estimate crystallized ~1000–1015 °C 1.2–1.4 GPa pressure uppermost mantle under oxidising conditions (ΔlogfO2(FMQ)~ + 1.3). precipitated from volatile element-rich melt trachyte or phonolite composition, which might be derived by high-degree (>70%) fractional crystallisation.

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