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Crystal records of erupted vs. trapped magma in volcanic arcs.
Nature Communications · · Journal Article · Open access
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Abstract ↗AI summary
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Plagioclase in Central Andes arc andesites defines a narrow eruptibility field at An~61, distinguishing erupted melt from trapped crystal mush during mafic recharge.
- Why it matters: Silicic magma contributions to crustal growth versus explosive eruptions are hard to constrain because erupted records underrepresent the silicic endmember.
- What they did: The study uses textural, elemental, and isotopic signatures preserved in plagioclase to separate trapped from erupted crystal mush and to define the plagioclase eruptibility field (An~61).
- The result: Recycled plagioclase is dominantly An~43, indicating prolonged crystallisation and assimilation in silicic mushes; the same pattern across continental and composite arcs implies strong eruptive filtering, with rare rapid remobilisation enabling super-eruptions.
The findingWhy it mattersWhat they didThe result
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