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.

在过去的2000年中，从卡梅尼群岛火山中心（希腊）喷发的针孔岩熔岩的化学成分（SiO ₂ = 64.0–68.5％），这与斜长石丰富度（3–22％）和晶体尺寸分布的广泛范围形成对比。大多数斜长石晶体具有简单的分区，并独立出现或以具有更细颗粒的核的疏散簇出现。我们认为，岩浆多样性是由岩浆储层底部形成的晶体与更多基性岩浆的注入和囊泡作用所产生的气泡之间的相互作用而产生的。可以确定两种末端成员的情况：在青少年系统中，基础晶体块是松散连接的，并且容易被气泡形成破坏。晶体-气泡对聚集在储层顶部，从那里它们可以进入次火山岩管道系统，以产生高含量的，化学上未演化的岩浆。在成熟的系统中 晶体质量良好地相连，因此气泡取代了已演化的间隙岩浆，并且仅从晶体质量中释放出少量晶体。该过程产生具有较低晶体含量的化学演化的岩浆。最古老的熔岩似乎是从成熟系统中产生的，而最小的火山喷发是由幼年系统产生的熔岩。这种进展可能反映了过去2000年中总体休养时间的减少。