Snæfell zircon geochronology and geochemistry

Zircon-based U-Pb geochronology, trace element concentrations, and O and Hf isotope compositions for Snæfell, an off-rift volcano in eastern Iceland. U-Pb zircon ages range from 545±59 to 266±16 ka (2SE), zircon δ18O is restricted to ~3.5 to 4‰, and zircon εHf ranges ~+13 to ~+17. Ti concentrations in zircon <5 ppm suggest a cool, near-solidus, crystallization environment for the majority of the zircon’s pre-eruptive history, with elevated Ti in zircon surfaces suggesting a late thermal perturbation.

基于锆石U-Pb年代学、微量元素浓度以及氧和铪同位素组成的Snæfell火山数据集，Snæfell火山位于冰岛东部断陷带。锆石U-Pb年龄范围介于545±59至266±16千年前（2倍标准误差），锆石δ18O同位素比值受限于约3.5至4‰之间，锆石εHf比值范围约为+13至+17。锆石中钛浓度低于5 ppm表明，在锆石大部分的未爆发历史中，其结晶环境为冷却的近固相状态，而锆石表面钛含量升高则暗示了晚期热扰动的存在。