title: Ultrapotassic Volcanism from the Waning Stage of the Neotethyan Subduction: a Key Study from the Izmir–Ankara–Erzincan Suture Belt, Central Northern Turkey
abstract: Upper Cretaceous volcano-sedimentary successions in the Central Pontides of Turkey, related to the closure of the Tethys Ocean, include a variety of alkaline ultrapotassic igneous rocks that have been classified as leucititic, lamprophyric and trachytic based on their mineral paragenesis. Although the ultrapotassic rocks display a range of K 2 O contents (09-84 wt %) that may partly reflect alteration processes, they display subduction-related trace element signatures characterized by significan
journal: Journal of Petrology