Spectrochemical Determinations in Garnets Using a Laser Microprobe

Abstract

Spectrochemical determinations of Fe, Mg, Mn, and Ca in garnets by use of a laser micro-probe were performed in matrix. Standards were prepared by fusion of chemically analyzed mineral powders and these standard glasses were excited in the same manner as the mineral unknowns. Comparison of results with the rock standard W-1 showed good accuracy and reproducibility. The precision and accuracy of the method as a whole deems it suitable for most mineralogic investigations where analysis in matrix is desirable.

Analysis of fluid inclusions using a pulsed laser microprobe

“…The first detailed mineral analysis by laser microprobe demonstrated the reproducibility and low detection limits that could be obtained (Snetsinger and Keil, I967). Subsequently, mineral zoning and trace element variations across single crystals have been successfully investigated by laser microprobe (Blackburn et al, I968;Blackburn, I969;Eremin, 1975;Blackburn and Schwendeman, I977). Previous attempts at fluid inclusion analysis by this method were described by Tsui et al (:975), and Tsui and Holland (I979), who used standard fluids recessed into fused silica-glass plates to calibrate the instrument for semi-quantitative analysis.…”