Mathematics – Logic
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70.2827a&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 70, Issue 11, p. 2827-2835.
Mathematics
Logic
7
Scientific paper
The laser fluorination technique reported here for analyzing the oxygen isotope composition (δ18O) of fine quartz size fractions 50 20, 20 10, 10 5, 5 2, 2 1 and <1 μm has been validated by comparison with the ion microprobe technique. It yields accurate δ18O data with an external precision better than 0.15‰. This is a significant methodological improvement for isotopic studies dealing with materials such as soil or biogenic oxides and silicates: particles are often too small and recovered in insufficient amount to be easily handled for ion microprobe analysis. Both techniques were used to investigate δ18O composition of a Cretaceous quartzite and silcrete sequence from the South-East of France. Quartzite cements average 31.04 ± 1.93‰. They formed from Mid-Cretaceous seawater. Higher in the series, silcretes cements average 26.66 ± 1.36‰. They formed from Upper- or post-Upper-Cretaceous soil water and groundwater. Oxygen isotope data show that the silicification steps from one mineralogical phase to another and from one layer to another (including from an upper pedogenic silcrete to a lower groundwater silcrete) occurred in a closed or weakly evaporating hydrological system.
Alexandre Anne
Basile-Doelsch Isabelle
Colin Fabrice
Meunier Jean-Dominique
Parron Claude
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