TY - JOUR
T1 - Stepwise fluorination-a useful approach for the isotopic analysis of hydrous minerals
AU - Haimson, Marshall
AU - Knauth, L. Paul
N1 - Funding Information:
Acknowledgements-Thaeu thors thank Amoco Production Research for its support of this investigation. Additional support was provided by NSF grant EAR-800 1158.
PY - 1983/9
Y1 - 1983/9
N2 - Analytical uncertainties in oxygen isotopic studies of hydrous silica have been investigated using a partial fluorination procedure in which fractional oxygen yields are achieved by reducing the amount of fluorine. Stepwise reaction of opaline silica results in a set of sequential oxygen fractions which show a wide range of δ18O values due to variable amounts of water, organic matter, and other impurities, δ-values for successive fractions in non-biogenic opal systematically increase as water is reacted away and then remain constant to within ±0.2%. as the remaining silica reacts, δ-values in biogenic silica increase similarly but then decrease when low 18O oxide(?) impurities begin to react. The troublesome water component in opal is readily removed by Stepwise fluorination. This technique allows more precise oxygen isotope analysis of non-biogenic opal-A, and may improve the analytical precision for biogenic silica and any silicate mineral containing a significant water component.
AB - Analytical uncertainties in oxygen isotopic studies of hydrous silica have been investigated using a partial fluorination procedure in which fractional oxygen yields are achieved by reducing the amount of fluorine. Stepwise reaction of opaline silica results in a set of sequential oxygen fractions which show a wide range of δ18O values due to variable amounts of water, organic matter, and other impurities, δ-values for successive fractions in non-biogenic opal systematically increase as water is reacted away and then remain constant to within ±0.2%. as the remaining silica reacts, δ-values in biogenic silica increase similarly but then decrease when low 18O oxide(?) impurities begin to react. The troublesome water component in opal is readily removed by Stepwise fluorination. This technique allows more precise oxygen isotope analysis of non-biogenic opal-A, and may improve the analytical precision for biogenic silica and any silicate mineral containing a significant water component.
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U2 - 10.1016/0016-7037(83)90185-0
DO - 10.1016/0016-7037(83)90185-0
M3 - Article
AN - SCOPUS:0020974821
SN - 0016-7037
VL - 47
SP - 1589
EP - 1595
JO - Geochimica et Cosmochimica Acta
JF - Geochimica et Cosmochimica Acta
IS - 9
ER -