Abstract
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 delta/sup 18/O values due to variable amounts of water, organic matter, and other impurities. Delta-values for successive fractions in non-biogenic opal systematically increase as water is reacted away and then remain constant to within +- 0.2 per thousand as the remaining silica reacts. Delta-values in biogenic silica increase similarly but then decrease when low /sup 18/O 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.
Citation Formats
Haimson, M, and Knauth, L P.
Stepwise fluorination - a useful approach for the isotopic analysis of hydrous minerals.
United Kingdom: N. p.,
1983.
Web.
doi:10.1016/0016-7037(83)90185-0.
Haimson, M, & Knauth, L P.
Stepwise fluorination - a useful approach for the isotopic analysis of hydrous minerals.
United Kingdom.
https://doi.org/10.1016/0016-7037(83)90185-0
Haimson, M, and Knauth, L P.
1983.
"Stepwise fluorination - a useful approach for the isotopic analysis of hydrous minerals."
United Kingdom.
https://doi.org/10.1016/0016-7037(83)90185-0.
@misc{etde_5221733,
title = {Stepwise fluorination - a useful approach for the isotopic analysis of hydrous minerals}
author = {Haimson, M, and Knauth, L P}
abstractNote = {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 delta/sup 18/O values due to variable amounts of water, organic matter, and other impurities. Delta-values for successive fractions in non-biogenic opal systematically increase as water is reacted away and then remain constant to within +- 0.2 per thousand as the remaining silica reacts. Delta-values in biogenic silica increase similarly but then decrease when low /sup 18/O 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.}
doi = {10.1016/0016-7037(83)90185-0}
journal = []
volume = {47:9}
journal type = {AC}
place = {United Kingdom}
year = {1983}
month = {Sep}
}
title = {Stepwise fluorination - a useful approach for the isotopic analysis of hydrous minerals}
author = {Haimson, M, and Knauth, L P}
abstractNote = {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 delta/sup 18/O values due to variable amounts of water, organic matter, and other impurities. Delta-values for successive fractions in non-biogenic opal systematically increase as water is reacted away and then remain constant to within +- 0.2 per thousand as the remaining silica reacts. Delta-values in biogenic silica increase similarly but then decrease when low /sup 18/O 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.}
doi = {10.1016/0016-7037(83)90185-0}
journal = []
volume = {47:9}
journal type = {AC}
place = {United Kingdom}
year = {1983}
month = {Sep}
}