A new protocol for oxygen isotope analysis of authigenic and biogenic fine silica grains using laser-extraction technique
Résumé
We report here a 30 W CO 2 laser heating protocol for analyzing oxygen isotope composition (d 18 O in x vs. V-SMOW) of quartz and amorphous silica grains lower than 50 and 2 Am with a good external precision (1r b 0.15x). This technique is used to investigate d 18 O 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. d 18 O data obtained from this technique are compared with d 18 O data obtained from in situ ion microprobe analyses. This study also presents promising results on d 18 O analysis of phytoliths obtained with the laser heating protocol (1r b 0.1x).
Origine | Publication financée par une institution |
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