Abstract
Kisch and van den Kerkhof (1991) presented an interesting study supporting our view that laser Raman microprobe (LRM) spectroscopy is a powerful tool for investigating fluid inclusions in the C-O-H-N system. We are not challenging the validity of either their microthermometric data or the geological interpretations drawn therefrom. However, we respectfully wish to point out some shortcomings in their analytical approach and interpretation of Raman spectra, which, in some circumstances, could lead to significant errors in the derivation of compositional and P-V-T information. In the context of this discussion, we also will comment on (1) which parameters can be determined or inferred from the Raman spectra of fluids, (2) the specific spectral data and analytical conditions necessary for such determinations, and (3) the potential errors involved in applying such data to geological systems. Moreover, to assist outside readers in the interpretation and evaluation of spectroscopic data,we also propose some guidelines for the documentation of Raman analyses.
