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Abstract. The bulk composition of magma erupted from Volcn Arenal has remained nearly constant (SiO2 = 53.654.9wt%; MgO = 5.04.5wt%) during almost 30years of continuous activity (19691996). None the less, clinopyroxene (cpx) phenocrysts and their spinel inclusions record a much more complex open-system evolution in which steady-state production of the erupted basaltic andesitic magma is linked to...
The bulk composition of magma erupted from Volcán Arenal has remained nearly constant (SiO2 = 53.6–54.9 wt%; MgO = 5.0–4.5 wt%) during almost 30 years of continuous activity (1969–1996). None the less, clinopyroxene (cpx) phenocrysts and their spinel inclusions record a much more complex open-system evolution in which steady-state production of the erupted basaltic andesitic magma is linked to episodic...
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