Study of growth rate of alkali feldspar in Phlegraean Fields trachytes

TL;DRAbstract

The aim of the work presented in this paper is to acquire experimental knowledge of the growth kinetics of alkali feldspar in Phlegraean Fields trachytic melts, with emphasis on magmas erupted in the Monte Nuovo event of 1538, to constrain system time scales of magmatic processes. Data on alkali feldspar crystallization kinetics in trachytic melts are totally absent from the available scientific literature. Starting from a trachytic composition coming from Phlegrean Fields, cooling and decompression experiments were performed at different condition of T and P and with different duration (crystallization time): experimental pressure varies between 30 and 200 MPa, temperature between 750 and 860°C, time between 7200 and 57600 seconds and fO2 = NNO + 0.8 (Di Matteo et al., 2004). For every series of decompression experiment with constant ∆T, we always performed an experiment where there was no decompression, to allow a comparison between the growth rate in decompressed experiments wi

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