{"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 mush?","topic_ref":"55338021c8ec86f4869f67772d325391efbf51e4cd18d86f6f0b30da4d45908b"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"11e05b8f92a4056021cd6747afe970307f959c29d2a6f29eadd456bb5ab38526","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"c5d6276c7711587d0930c586c02ea334ad5c62fee52f02bf3b24250cb34a4640","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Z2fdRAZwyTRLxpkIYrDJpFqeD7iaxbFBywUnT2w4W9CFLRyvMsqU_N3EOWuUIWPNs7FVD1qpAXED8euEOB0UDQ"},"schema":"pubphys.envelope/1"},"record_hash":"11e05b8f92a4056021cd6747afe970307f959c29d2a6f29eadd456bb5ab38526","leaf_index":1387}