isogeochem (version 1.1.1)

a18_CO2acid_c: 18O/16O acid fractionation factor

Description

a18_CO2acid_c() calculates the 18O/16O fractionation factor between CO2 produced from acid digestion and carbonate.

Usage

a18_CO2acid_c(temp, min)

Value

Returns the 18O/16O fractionation factor.

Arguments

temp

Acid digestion temperature (°C).

min

Mineralogy. Options are "calcite", "aragonite", and "dolomite".

Details

calcite (Kim et al. 2015):

$$\alpha^{18}_{CO2acid/calcite} = e^{(3.48 \times \frac{1}{T} - 0.00147)}$$

aragonite (Kim et al. 2007):

$$\alpha^{18}_{CO2acid/aragonite} = e^{(3.39 \times \frac{1}{T} - 0.00083)}$$

dolomite (Rosenbaum & Sheppard 1986):

$$\alpha^{18}_{CO2acid/dolomite} = e^{(665 \times \frac{1}{T^{2}} + 0.00423)}$$

References

Sharma, T., and Clayton, R. N. (1965). Measurement of ratios of total oxygen of carbonates. Geochimica et Cosmochimica Acta, 29(12), 1347-1353. tools:::Rd_expr_doi("10.1016/0016-7037(65)90011-6")

Rosenbaum, J. and Sheppard, S.M.F. (1986). An isotopic study of siderites, dolomites and ankerites at high temperatures. Geochimica et Cosmochimica Acta, 50, 1147-1150. tools:::Rd_expr_doi("10.1016/0016-7037(86)90396-0")

Kim, S.-T., Mucci, A., and Taylor, B. E. (2007). Phosphoric acid fractionation factors for calcite and aragonite between 25 and 75 °C: Revisited. Chemical Geology, 246(3-4), 135-146. tools:::Rd_expr_doi("10.1016/j.chemgeo.2007.08.005")

Kim, S.-T., Coplen, T. B., and Horita, J. (2015). Normalization of stable isotope data for carbonate minerals: Implementation of IUPAC guidelines. Geochimica et Cosmochimica Acta, 158, 276-289. tools:::Rd_expr_doi("10.1016/j.gca.2015.02.011")

See Also

Other fractionation_factors: a13_CO2g_CO2aq(), a18_CO2aq_H2O(), a18_CO2g_H2O(), a18_CO3_H2O(), a18_H2O_OH(), a18_HCO3_H2O(), a18_c_H2O(), a_A_B()

Examples

a18_CO2acid_c(temp = 90, min = "calcite")
a18_CO2acid_c(temp = 72, min = "aragonite")