Influence of pre-existing nuclei on the crystallization kinetics of primitive alkaline magmas: Insights on the deep feeding system of the campi flegrei Volcanic district

Barbara Bonechi* (Corresponding)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Aiming to evaluate the influence of pre-existing nuclei on the clinopyroxene crystallization kinetics, time-series experiments were performed using both natural and vitrified starting materials. Experiments were carried out at pressure of 0.8 GPa, temperatures between 1220 and 1250 °C, and dwell times ranging from 0.16 to 12 h. Clinopyroxene growth rates of the runs performed using the natural starting material containing pre-existing nuclei (~2 × 10−7 to ~6 × 10−8 cm∙s−1) are higher than those of the runs performed using the vitrified one (~3 × 10−7 to ~2 × 10−8 cm∙s−1). In both cases the growth rates decrease with increasing time. Conversely, clinopyroxene nucleation rates are lower in the experiments performed using the natural powder (102 and 10 mm−3 s−1) compared to those performed with the glassy starting material (105 and 103 mm−3∙s−1). The nucleation rates tend to decrease increasing dwell time in all the series up to ~3 h, after which it remains nearly constant. Finally, the combination of the obtained clinopyroxene growth rates with the crystal size analysis of natural clinopyroxenes, allowed to estimate the magma ascent rate and the recharge rate of the Campi Flegrei Volcanic District deep reservoir.

Original languageEnglish
Article number234
JournalMinerals
Volume10
Issue number3
DOIs
Publication statusPublished - Mar 2020

Keywords

  • Clinopyroxene
  • Crystal growth rate
  • Heterogeneous nucleation
  • High pressure
  • Pre-existing nuclei
  • Procida island

Fingerprint

Dive into the research topics of 'Influence of pre-existing nuclei on the crystallization kinetics of primitive alkaline magmas: Insights on the deep feeding system of the campi flegrei Volcanic district'. Together they form a unique fingerprint.

Cite this