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Raman spectroscopy is widely used to identify mineral and fluid inclusions in host crystals, as well as to calculate pressure-temperature ( P - T ) conditions with mineral inclusion elastic thermobarometry, for example quartz-in-garnet barometry (QuiG) and zircon-in-garnet thermometry (ZiG). For thermobarometric applications,  P - T  precision and accuracy depend crucially on the reproducibility of Raman peak position measurements. In this study, we monitored long-term instrument stability and varied analytical parameters to quantify peak position reproducibility for Raman spectra from quartz and zircon inclusions and reference crystals. Our ultimate goal was to determine the reproducibility of calculated inclusion pressures (“ P  inc ”) and entrapment pressures (“ P  trap ”) or temperatures (“ T  trap ”) by quantifying diverse analytical errors, as well as to identify optimal measurement conditions and provide a baseline for interlaboratory comparisons. Most tests emphasized 442 nm (blue) and 532 nm (green) laser sources, although repeated analysis of a quartz inclusion in garnet additionally used a 632.8 nm (red) laser. Power density was varied from &lt;1 to &gt;100 mW and acquisition time from 3 to 270s. A correction is proposed to suppress interference on the ~206 cm –1  peak in quartz spectra by a broad nearby (~220 cm –1 ) peak in garnet spectra.

Optimizing Raman spectral collection for quartz and zircon crystals for elastic thermobarometry