Kameni volcano, Thera, Greece.


1) Chemical and textural diversity of Kameni (Greece) dacites:
Role of vesiculation in juvenile and mature basal crystal masses

Dacite lavas erupted from Kameni Islands volcanic centre (Greece) during the last 2000 years have a limited range in chemical composition (SiO2 = 64.0-68.5%) which contrasts with their wide range in plagioclase abundance (3-22%) and crystal size distributions. Most plagioclase crystals have simple zoning and occur independently or in loose clusters with finer-grained cores. We propose that magmatic diversity was produced by the interaction between crystals that formed at the base of a magma reservoir and bubbles produced by injection and vesiculation of more mafic magma. Two end-member situations can be identified: In juvenile systems, the basal crystal mass is loosely connected and readily disrupted by bubble formation. The crystal-bubble couples accumulate at the top of the reservoir, from where they can enter the sub-volcanic plumbing system to produce high-crystal content, chemically unevolved magmas. In the mature system, the crystal mass is well connected so bubbles displace the evolved, interstitial magma and liberate only a smaller number of crystals from the crystal mass. This process produces chemically evolved magmas, with lower crystal contents. The oldest lavas seem to have been produced from mature systems, whereas the youngest eruptions were of lavas produced from juvenile systems. This progression may reflect an overall reduction in repose times during the last two thousand years.

Higgins, M.D., Debecq, A., Vander Auwera, J., Nomoikou, P., Chemical and textural diversity of Kameni (Greece) dacites: role of vesiculation in juvenile and mature basal crystal masses. Contrib Mineral Petrol 176, 13 (2021). https://doi.org/10.1007/s00410-020-01764-3

2) Magma dynamics beneath Kameni volcano, Thera, Greece, 
as revealed by crystal size and shape measurements.



The eruption of 1866. The Kameni island lie at the centre of the caldera.

Sizes distributions of plagioclase crystals in series of recent porphyritic dacite lavas from Kameni volcano, Greece, can be modelled by mixing two populations of crystals, each with overlapping linear crystal size distributions (CSD) - termed microlites and megacrysts. The magmas bearing the microlites and megacrysts started to crystallise 6-13 and 24-96 years respectively before each eruption. The dates of initiation of crystallisation of the megacrysts indicates that they are left-overs of earlier injections of new magma into a shallow chamber: Some magma remains after each eruption and continues to crystallise. New magma with few or no crystals is then introduced and the microlites crystallise from the mixed magma. Eruption followed 6-13 years after mixing.  Such a model would suggest that some porphyritic magmas are products of a shallow magma chamber that is never completely emptied, just topped up from time to time.
 

Higgins, M.D., 1996, Magma dynamics beneath Kameni volcano, Greece, as revealed by crystal size and shape measurements: Journal of Volcanology and Geothermal Research, v. 70, p. 37-48. https://doi.org/10.1016/0377-0273(95)00045-3