X4Knowledge Book Tiles

Volcanic Thermobarometry — Magma Storage Conditions & P-T Intelligence

KBT-PUTIRKA-THERMOBAR-1.0

Core thesis The chemistry of phenocrysts and their melt inclusions records the pressure-temperature conditions of magma storage and ascent — and calibrated mineral-melt equilibrium equations allow us to read those conditions quantitatively from standard petrographic data.

Primary frameworks

  • Olivine-Melt Thermometry — Fe-Mg exchange KD calibrations for basaltic magma temperature estimation
  • Clinopyroxene-Melt Barometry — pressure-sensitive exchange equilibria for magma storage depth
  • Two-Pyroxene Thermometry — Fe-Mg exchange between coexisting pyroxenes as temperature recorder
  • Feldspar Saturation Thermometry — plagioclase and alkali feldspar saturation as solidus temperature indicators
  • Amphibole Thermobarometry — hornblende composition as P-T-H₂O recorder in arc magmas
  • Volatile Saturation Models — H₂O-CO₂ solubility constraints on storage depth and degassing path
  • Melt Inclusion Entrapment Conditions — reconstructing pre-eruptive melt composition from inclusion data

What this tile gives an agent:

  • Apply olivine-melt and clinopyroxene-melt equilibria to constrain basaltic magma temperatures
  • Calculate magma storage depths from clinopyroxene barometry and volatile saturation models
  • Interpret mineral zoning and inclusion data as records of pre-eruptive magma mixing and ascent
  • Apply amphibole thermobarometry to arc magma storage condition reconstruction
  • Use thermobarometric data to constrain magma plumbing architecture for hazard assessment

What it extracts

  • Olivine-Melt Thermometry — apply Fe-Mg exchange calibrations to basaltic magma temperature estimation
  • Clinopyroxene Barometry — calculate storage pressure from cpx-melt equilibrium equations
  • Two-Pyroxene Thermometry — apply coexisting pyroxene Fe-Mg exchange to temperature reconstruction
  • Feldspar Saturation Thermometry — use plagioclase and alkali feldspar saturation as solidus indicators
  • Amphibole Thermobarometry — apply hornblende composition to arc magma P-T-H₂O conditions
  • Volatile Saturation Barometry — constrain storage depth from H₂O-CO₂ solubility in melt inclusions
  • Melt Inclusion Reconstruction — restore pre-eruptive melt composition from trapped inclusion analysis
  • Mineral Zoning Interpretation — read temperature and composition changes from crystal growth zoning profiles
  • Magma Mixing Detection — identify disequilibrium textures as evidence of magma mixing events
  • Plumbing Architecture Reconstruction — build multi-level storage model from thermobarometric data
  • Eruption Trigger Assessment — apply pre-eruptive P-T conditions to evaluate overpressure and ascent triggers
  • Phase Equilibria Calibration — apply Putirka 2008 equations and uncertainty estimates to mineral analyses

Output Schema Fields

principlewhen_to_applyagent_instructionkey_quotecommon_misapplicationcomplementary_principlesexample_response_pattern

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CategoryKnowledge Book Tiles
TypeX4

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