Abstract
We report here a 30 W CO 2 laser heating protocol for analyzing oxygen isotope composition ( δ 18O in ‰ vs. V-SMOW) of quartz and amorphous silica grains lower than 50 and 2 μm with a good external precision (1 σ < 0.15‰). This technique is used to investigate δ 18O composition of macro-, micro- and crypto-crystalline quartz cements of quartzite levels occurring in a sand sequence from the South of France (Apt Series), after a physical separation of the quartz cements. δ 18O data obtained from this technique are compared with δ 18O data obtained from in situ ion microprobe analyses. This study also presents promising results on δ 18O analysis of phytoliths obtained with the laser heating protocol (1 σ < 0.1‰).
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