Abstract
The advent of laser Raman microprobe (LRM) instruments has permitted researchers to analyze minute (≥ 1 μm) phases <i>in situ</i> in their rock matrix. Geologists prefer to study such samples in polished thin-sections (in which a rock wafer is fixed with a mounting medium onto a glass slide and thinned to 30 μm thickness) or in doubly polished unmounted rock wafers (≥30 μm) like those used for microthermometry. There obviously are many advantages to doing <i>in situ</i> LRM analysis: direct observation of the sample grain in its textural and mineralogical context, preservation of the grain for analysis by additional techniques, and lack of physical disruption and possible modification of the grain caused by physical removal from its matrix. However, there are some problems inherent in this application of the LRM technique. This brief communication is a cautionary note about three possible artifacts that may arise during <i>in situ</i> LRM analysis of graphitic material and hydrocarbon fluids in polished rock sections.
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