Bubbles; CSD; Dacite; Enclaves; Santorini; Texture; Geophysics; Geochemistry and Petrology
Abstract :
[en] 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 2000 years.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Higgins, Michael D. ; Sciences Appliquées, Université du Québec à Chicoutimi, Québec, Canada
Debecq, Anouk; Université Libre de Bruxelles, Bruxelles, Belgium
Vander Auwera, Jacqueline ; Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Nomikou, Paraskevi; National and Kapodistrian University of Athens, Athens, Greece
Language :
English
Title :
Chemical and textural diversity of Kameni (Greece) dacites: role of vesiculation in juvenile and mature basal crystal masses
Publication date :
February 2021
Journal title :
Contributions to Mineralogy and Petrology
ISSN :
0010-7999
eISSN :
1432-0967
Publisher :
Springer Science and Business Media Deutschland GmbH
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