{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"339397c6b2cb7c527eaf8021b51e47e86f57d34f37e2d6ea79d296548580ce85","created":"2026-10-03T07:18:03Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"9ade93c7869f312f3bd738850cc6b8f805baff1a46609e9c2b1842b807cc7439","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"earth.volcano-physics.mush-longevity","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Under many volcanoes magma is stored for long times as a crystal mush, mostly crystals with a little melt between them. How long it stays there and at what temperature is debated.","posed_since":"","precise":"Determine the thermal history of upper-crustal magma reservoirs: the fraction of their lifetime ($10^{4}\\ \\text{to}\\ 10^{6}\\,\\mathrm{yr}$) spent as eruptible magma (crystal fraction below about 0.5) versus near-solidus cold storage, using crystal diffusion chronometry, zircon geochronology and thermal models. An answer is a reconciled storage temperature-time history for well-studied systems.","problem_ref":null,"references":"","settled_by":"Diffusion and U-Th zircon chronometry from the same crystals reconciled with thermal-mechanical models of incremental reservoir growth.","status_note":"","title":"How long do crustal magma reservoirs persist as crystal 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